diff --git a/encode_compile.go b/encode_compile.go
index 1f5d4a6..ce028bd 100644
--- a/encode_compile.go
+++ b/encode_compile.go
@@ -433,10 +433,13 @@ func (e *Encoder) typeToFieldType(op opType) opType {
 	return opStructField
 }
 
-func (e *Encoder) optimizeStructHeader(op opType, isOmitEmpty, withIndent bool) opType {
+func (e *Encoder) optimizeStructHeader(op opType, tag *structTag, withIndent bool) opType {
 	headType := e.typeToHeaderType(op)
-	if isOmitEmpty {
+	switch {
+	case tag.isOmitEmpty:
 		headType = headType.headToOmitEmptyHead()
+	case tag.isString:
+		headType = headType.headToStringTagHead()
 	}
 	if withIndent {
 		return headType.toIndent()
@@ -444,10 +447,13 @@ func (e *Encoder) optimizeStructHeader(op opType, isOmitEmpty, withIndent bool)
 	return headType
 }
 
-func (e *Encoder) optimizeStructField(op opType, isOmitEmpty, withIndent bool) opType {
+func (e *Encoder) optimizeStructField(op opType, tag *structTag, withIndent bool) opType {
 	fieldType := e.typeToFieldType(op)
-	if isOmitEmpty {
+	switch {
+	case tag.isOmitEmpty:
 		fieldType = fieldType.fieldToOmitEmptyField()
+	case tag.isString:
+		fieldType = fieldType.fieldToStringTagField()
 	}
 	if withIndent {
 		return fieldType.toIndent()
@@ -481,7 +487,13 @@ func (e *Encoder) compiledCode(typ *rtype, withIndent bool) *opcode {
 	return nil
 }
 
-func (e *Encoder) keyNameAndOmitEmptyFromField(field reflect.StructField) (string, bool) {
+type structTag struct {
+	key         string
+	isOmitEmpty bool
+	isString    bool
+}
+
+func (e *Encoder) structTagFromField(field reflect.StructField) *structTag {
 	keyName := field.Name
 	tag := e.getTag(field)
 	opts := strings.Split(tag, ",")
@@ -490,16 +502,17 @@ func (e *Encoder) keyNameAndOmitEmptyFromField(field reflect.StructField) (strin
 			keyName = opts[0]
 		}
 	}
-	isOmitEmpty := false
+	st := &structTag{key: keyName}
 	if len(opts) > 1 {
-		isOmitEmpty = opts[1] == "omitempty"
+		st.isOmitEmpty = opts[1] == "omitempty"
+		st.isString = opts[1] == "string"
 	}
-	return keyName, isOmitEmpty
+	return st
 }
 
-func (e *Encoder) structHeader(fieldCode *structFieldCode, valueCode *opcode, isOmitEmpty, withIndent bool) *opcode {
+func (e *Encoder) structHeader(fieldCode *structFieldCode, valueCode *opcode, tag *structTag, withIndent bool) *opcode {
 	fieldCode.indent--
-	op := e.optimizeStructHeader(valueCode.op, isOmitEmpty, withIndent)
+	op := e.optimizeStructHeader(valueCode.op, tag, withIndent)
 	fieldCode.op = op
 	switch op {
 	case opStructFieldHead,
@@ -511,9 +524,9 @@ func (e *Encoder) structHeader(fieldCode *structFieldCode, valueCode *opcode, is
 	return (*opcode)(unsafe.Pointer(fieldCode))
 }
 
-func (e *Encoder) structField(fieldCode *structFieldCode, valueCode *opcode, isOmitEmpty, withIndent bool) *opcode {
+func (e *Encoder) structField(fieldCode *structFieldCode, valueCode *opcode, tag *structTag, withIndent bool) *opcode {
 	code := (*opcode)(unsafe.Pointer(fieldCode))
-	op := e.optimizeStructField(valueCode.op, isOmitEmpty, withIndent)
+	op := e.optimizeStructField(valueCode.op, tag, withIndent)
 	fieldCode.op = op
 	switch op {
 	case opStructField,
@@ -551,7 +564,7 @@ func (e *Encoder) compileStruct(typ *rtype, isPtr, root, withIndent bool) (*opco
 		if e.isIgnoredStructField(field) {
 			continue
 		}
-		keyName, isOmitEmpty := e.keyNameAndOmitEmptyFromField(field)
+		tag := e.structTagFromField(field)
 		fieldType := type2rtype(field.Type)
 		if isPtr && i == 0 {
 			// head field of pointer structure at top level
@@ -579,7 +592,7 @@ func (e *Encoder) compileStruct(typ *rtype, isPtr, root, withIndent bool) (*opco
 				f = f.nextField.toStructFieldCode()
 			}
 		}
-		key := fmt.Sprintf(`"%s":`, keyName)
+		key := fmt.Sprintf(`"%s":`, tag.key)
 		fieldCode := &structFieldCode{
 			opcodeHeader: &opcodeHeader{
 				typ:    valueCode.typ,
@@ -591,13 +604,13 @@ func (e *Encoder) compileStruct(typ *rtype, isPtr, root, withIndent bool) (*opco
 			offset:       field.Offset,
 		}
 		if fieldIdx == 0 {
-			code = e.structHeader(fieldCode, valueCode, isOmitEmpty, withIndent)
+			code = e.structHeader(fieldCode, valueCode, tag, withIndent)
 			head = fieldCode
 			prevField = fieldCode
 		} else {
 			fcode := (*opcode)(unsafe.Pointer(fieldCode))
 			code.next = fcode
-			code = e.structField(fieldCode, valueCode, isOmitEmpty, withIndent)
+			code = e.structField(fieldCode, valueCode, tag, withIndent)
 			prevField.nextField = fcode
 			prevField = fieldCode
 		}
diff --git a/encode_vm.go b/encode_vm.go
index 64d2731..cfe5dde 100644
--- a/encode_vm.go
+++ b/encode_vm.go
@@ -2752,6 +2752,1061 @@ func (e *Encoder) run(code *opcode) error {
 				}
 				field.nextField.ptr = field.ptr
 			}
+		case opStructFieldPtrHeadStringTag:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTag:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				p := ptr + field.offset
+				e.encodeBytes(field.key)
+				code = field.next
+				code.ptr = p
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTag:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTag:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				code = field.next
+				code.ptr = ptr + field.offset
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagInt:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagInt:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt8:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt8:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt8(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagInt8:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagInt8:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt8(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt16:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt16:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt16(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagInt16:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagInt16:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt16(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt32:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt32:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagInt32:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagInt32:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt64:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt64:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt64(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagInt64:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagInt64:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToInt64(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagUint:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagUint:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint8:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint8:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint8(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagUint8:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagUint8:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint8(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint16:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint16:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint16(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagUint16:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagUint16:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint16(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint32:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint32:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagUint32:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagUint32:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint64:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint64:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint64(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagUint64:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagUint64:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToUint64(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagFloat32:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagFloat32:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToFloat32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagFloat32:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagFloat32:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToFloat32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagFloat64:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagFloat64:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				v := e.ptrToFloat64(ptr + field.offset)
+				if math.IsInf(v, 0) || math.IsNaN(v) {
+					return &UnsupportedValueError{
+						Value: reflect.ValueOf(v),
+						Str:   strconv.FormatFloat(v, 'g', -1, 64),
+					}
+				}
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(v))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagFloat64:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagFloat64:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				v := e.ptrToFloat64(ptr + field.offset)
+				if math.IsInf(v, 0) || math.IsNaN(v) {
+					return &UnsupportedValueError{
+						Value: reflect.ValueOf(v),
+						Str:   strconv.FormatFloat(v, 'g', -1, 64),
+					}
+				}
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(v))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagString:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagString:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(strconv.Quote(e.ptrToString(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagString:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagString:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(strconv.Quote(e.ptrToString(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagBool:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagBool:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToBool(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagBool:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagBool:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				e.encodeString(fmt.Sprint(e.ptrToBool(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagBytes:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagBytes:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				e.encodeBytes(field.key)
+				s := base64.StdEncoding.EncodeToString(
+					e.ptrToBytes(ptr + field.offset),
+				)
+				e.encodeByte('"')
+				e.encodeBytes(*(*[]byte)(unsafe.Pointer(&s)))
+				e.encodeByte('"')
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagBytes:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagBytes:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				e.encodeBytes(field.key)
+				s := base64.StdEncoding.EncodeToString(
+					e.ptrToBytes(ptr + field.offset),
+				)
+				e.encodeByte('"')
+				e.encodeBytes(*(*[]byte)(unsafe.Pointer(&s)))
+				e.encodeByte('"')
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagMarshalJSON:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagMarshalJSON:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				p := unsafe.Pointer(ptr + field.offset)
+				isPtr := code.typ.Kind() == reflect.Ptr
+				v := *(*interface{})(unsafe.Pointer(&interfaceHeader{typ: code.typ, ptr: p}))
+				b, err := v.(Marshaler).MarshalJSON()
+				if err != nil {
+					return &MarshalerError{
+						Type: rtype2type(code.typ),
+						Err:  err,
+					}
+				}
+				if len(b) == 0 {
+					if isPtr {
+						return errUnexpectedEndOfJSON(
+							fmt.Sprintf("error calling MarshalJSON for type %s", code.typ),
+							0,
+						)
+					}
+					e.encodeBytes(field.key)
+					e.encodeBytes([]byte{'"', '"'})
+					code = field.nextField
+				} else {
+					var buf bytes.Buffer
+					if err := compact(&buf, b, true); err != nil {
+						return err
+					}
+					e.encodeString(buf.String())
+					code = field.next
+				}
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagMarshalJSON:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagMarshalJSON:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				p := unsafe.Pointer(ptr + field.offset)
+				isPtr := code.typ.Kind() == reflect.Ptr
+				v := *(*interface{})(unsafe.Pointer(&interfaceHeader{typ: code.typ, ptr: p}))
+				b, err := v.(Marshaler).MarshalJSON()
+				if err != nil {
+					return &MarshalerError{
+						Type: rtype2type(code.typ),
+						Err:  err,
+					}
+				}
+				if len(b) == 0 {
+					if isPtr {
+						return errUnexpectedEndOfJSON(
+							fmt.Sprintf("error calling MarshalJSON for type %s", code.typ),
+							0,
+						)
+					}
+					e.encodeBytes(field.key)
+					e.encodeBytes([]byte{'"', '"'})
+					code = field.nextField
+				} else {
+					var buf bytes.Buffer
+					if err := compact(&buf, b, true); err != nil {
+						return err
+					}
+					e.encodeBytes(field.key)
+					e.encodeString(buf.String())
+					code = field.next
+				}
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagMarshalText:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagMarshalText:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeByte('{')
+				p := unsafe.Pointer(ptr + field.offset)
+				v := *(*interface{})(unsafe.Pointer(&interfaceHeader{typ: code.typ, ptr: p}))
+				bytes, err := v.(encoding.TextMarshaler).MarshalText()
+				if err != nil {
+					return &MarshalerError{
+						Type: rtype2type(code.typ),
+						Err:  err,
+					}
+				}
+				e.encodeBytes(field.key)
+				e.encodeString(*(*string)(unsafe.Pointer(&bytes)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrAnonymousHeadStringTagMarshalText:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldAnonymousHeadStringTagMarshalText:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				code = field.end.next
+			} else {
+				p := unsafe.Pointer(ptr + field.offset)
+				v := *(*interface{})(unsafe.Pointer(&interfaceHeader{typ: code.typ, ptr: p}))
+				bytes, err := v.(encoding.TextMarshaler).MarshalText()
+				if err != nil {
+					return &MarshalerError{
+						Type: rtype2type(code.typ),
+						Err:  err,
+					}
+				}
+				e.encodeBytes(field.key)
+				e.encodeString(*(*string)(unsafe.Pointer(&bytes)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagIndent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagIndent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				p := ptr + field.offset
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				code = field.next
+				code.ptr = p
+				field.nextField.ptr = field.ptr
+			}
+		case opStructFieldPtrHeadStringTagIntIndent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagIntIndent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToInt(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt8Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt8Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToInt8(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt16Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt16Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToInt16(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt32Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt32Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToInt32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagInt64Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagInt64Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToInt64(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUintIndent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUintIndent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToUint(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint8Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint8Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToUint8(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint16Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint16Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToUint16(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint32Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint32Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToUint32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagUint64Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagUint64Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToUint64(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagFloat32Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagFloat32Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToFloat32(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagFloat64Indent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagFloat64Indent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				v := e.ptrToFloat64(ptr + field.offset)
+				if math.IsInf(v, 0) || math.IsNaN(v) {
+					return &UnsupportedValueError{
+						Value: reflect.ValueOf(v),
+						Str:   strconv.FormatFloat(v, 'g', -1, 64),
+					}
+				}
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(v))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagStringIndent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagStringIndent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(strconv.Quote(e.ptrToString(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagBoolIndent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagBoolIndent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				e.encodeString(fmt.Sprint(e.ptrToBool(ptr + field.offset)))
+				code = field.next
+				field.nextField.ptr = ptr
+			}
+		case opStructFieldPtrHeadStringTagBytesIndent:
+			if code.ptr != 0 {
+				code.ptr = e.ptrToPtr(code.ptr)
+			}
+			fallthrough
+		case opStructFieldHeadStringTagBytesIndent:
+			field := code.toStructFieldCode()
+			ptr := field.ptr
+			if ptr == 0 {
+				e.encodeIndent(code.indent)
+				e.encodeNull()
+				code = field.end.next
+			} else {
+				e.encodeBytes([]byte{'{', '\n'})
+				e.encodeIndent(code.indent + 1)
+				e.encodeBytes(field.key)
+				e.encodeByte(' ')
+				s := base64.StdEncoding.EncodeToString(
+					e.ptrToBytes(ptr + field.offset),
+				)
+				e.encodeByte('"')
+				e.encodeBytes(*(*[]byte)(unsafe.Pointer(&s)))
+				e.encodeByte('"')
+				code = field.next
+				field.nextField.ptr = ptr
+			}
 		case opStructField:
 			if e.buf[len(e.buf)-1] != '{' {
 				e.encodeByte(',')
@@ -3138,6 +4193,33 @@ func (e *Encoder) run(code *opcode) error {
 			e.encodeByte('"')
 			code = code.next
 			c.nextField.ptr = c.ptr
+		case opStructFieldMarshalJSONIndent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			ptr := c.ptr + c.offset
+			v := *(*interface{})(unsafe.Pointer(&interfaceHeader{
+				typ: code.typ,
+				ptr: unsafe.Pointer(ptr),
+			}))
+			b, err := v.(Marshaler).MarshalJSON()
+			if err != nil {
+				return &MarshalerError{
+					Type: rtype2type(code.typ),
+					Err:  err,
+				}
+			}
+			var buf bytes.Buffer
+			if err := compact(&buf, b, true); err != nil {
+				return err
+			}
+			e.encodeBytes(buf.Bytes())
+			code = code.next
+			c.nextField.ptr = c.ptr
 		case opStructFieldOmitEmpty:
 			c := code.toStructFieldCode()
 			p := c.ptr + c.offset
@@ -3622,7 +4704,443 @@ func (e *Encoder) run(code *opcode) error {
 			}
 			code = code.next
 			code.ptr = c.ptr
-
+		case opStructFieldStringTag:
+			c := code.toStructFieldCode()
+			p := c.ptr + c.offset
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			code = code.next
+			code.ptr = p
+			c.nextField.ptr = c.ptr
+		case opStructFieldStringTagInt:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToInt(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagInt8:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToInt8(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagInt16:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToInt16(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagInt32:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToInt32(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagInt64:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToInt64(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToUint(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint8:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToUint8(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint16:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToUint16(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint32:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToUint32(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint64:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToUint64(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagFloat32:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToFloat32(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagFloat64:
+			c := code.toStructFieldCode()
+			v := e.ptrToFloat64(c.ptr + c.offset)
+			if math.IsInf(v, 0) || math.IsNaN(v) {
+				return &UnsupportedValueError{
+					Value: reflect.ValueOf(v),
+					Str:   strconv.FormatFloat(v, 'g', -1, 64),
+				}
+			}
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(v))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagString:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(strconv.Quote(e.ptrToString(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagBool:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			e.encodeString(fmt.Sprint(e.ptrToBool(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagBytes:
+			c := code.toStructFieldCode()
+			v := e.ptrToBytes(c.ptr + c.offset)
+			if e.buf[len(e.buf)-1] != '{' {
+				e.encodeByte(',')
+			}
+			e.encodeBytes(c.key)
+			s := base64.StdEncoding.EncodeToString(v)
+			e.encodeByte('"')
+			e.encodeBytes(*(*[]byte)(unsafe.Pointer(&s)))
+			e.encodeByte('"')
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagMarshalJSON:
+			c := code.toStructFieldCode()
+			ptr := c.ptr + c.offset
+			v := *(*interface{})(unsafe.Pointer(&interfaceHeader{
+				typ: code.typ,
+				ptr: unsafe.Pointer(ptr),
+			}))
+			b, err := v.(Marshaler).MarshalJSON()
+			if err != nil {
+				return &MarshalerError{
+					Type: rtype2type(code.typ),
+					Err:  err,
+				}
+			}
+			var buf bytes.Buffer
+			if err := compact(&buf, b, true); err != nil {
+				return err
+			}
+			e.encodeString(buf.String())
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagMarshalText:
+			c := code.toStructFieldCode()
+			ptr := c.ptr + c.offset
+			v := *(*interface{})(unsafe.Pointer(&interfaceHeader{
+				typ: code.typ,
+				ptr: unsafe.Pointer(ptr),
+			}))
+			bytes, err := v.(encoding.TextMarshaler).MarshalText()
+			if err != nil {
+				return &MarshalerError{
+					Type: rtype2type(code.typ),
+					Err:  err,
+				}
+			}
+			e.encodeString(*(*string)(unsafe.Pointer(&bytes)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagIndent:
+			c := code.toStructFieldCode()
+			p := c.ptr + c.offset
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			code = code.next
+			code.ptr = p
+			c.nextField.ptr = c.ptr
+		case opStructFieldStringTagIntIndent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToInt(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagInt8Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToInt8(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagInt16Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToInt16(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagInt32Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToInt32(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagInt64Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToInt64(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUintIndent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToUint(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint8Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToUint8(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint16Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToUint16(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint32Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToUint32(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagUint64Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToUint64(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagFloat32Indent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToFloat32(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagFloat64Indent:
+			c := code.toStructFieldCode()
+			v := e.ptrToFloat64(c.ptr + c.offset)
+			if math.IsInf(v, 0) || math.IsNaN(v) {
+				return &UnsupportedValueError{
+					Value: reflect.ValueOf(v),
+					Str:   strconv.FormatFloat(v, 'g', -1, 64),
+				}
+			}
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(v))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagStringIndent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			var b bytes.Buffer
+			enc := NewEncoder(&b)
+			enc.encodeString(e.ptrToString(c.ptr + c.offset))
+			e.encodeString(string(enc.buf))
+			enc.release()
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagBoolIndent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			e.encodeString(fmt.Sprint(e.ptrToBool(c.ptr + c.offset)))
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagBytesIndent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			s := base64.StdEncoding.EncodeToString(
+				e.ptrToBytes(c.ptr + c.offset),
+			)
+			e.encodeByte('"')
+			e.encodeBytes(*(*[]byte)(unsafe.Pointer(&s)))
+			e.encodeByte('"')
+			code = code.next
+			code.ptr = c.ptr
+		case opStructFieldStringTagMarshalJSONIndent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			ptr := c.ptr + c.offset
+			v := *(*interface{})(unsafe.Pointer(&interfaceHeader{
+				typ: code.typ,
+				ptr: unsafe.Pointer(ptr),
+			}))
+			b, err := v.(Marshaler).MarshalJSON()
+			if err != nil {
+				return &MarshalerError{
+					Type: rtype2type(code.typ),
+					Err:  err,
+				}
+			}
+			var buf bytes.Buffer
+			if err := compact(&buf, b, true); err != nil {
+				return err
+			}
+			e.encodeString(buf.String())
+			code = code.next
+			c.nextField.ptr = c.ptr
+		case opStructFieldStringTagMarshalTextIndent:
+			c := code.toStructFieldCode()
+			if e.buf[len(e.buf)-2] != '{' {
+				e.encodeBytes([]byte{',', '\n'})
+			}
+			e.encodeIndent(c.indent)
+			e.encodeBytes(c.key)
+			e.encodeByte(' ')
+			ptr := c.ptr + c.offset
+			v := *(*interface{})(unsafe.Pointer(&interfaceHeader{
+				typ: code.typ,
+				ptr: unsafe.Pointer(ptr),
+			}))
+			bytes, err := v.(encoding.TextMarshaler).MarshalText()
+			if err != nil {
+				return &MarshalerError{
+					Type: rtype2type(code.typ),
+					Err:  err,
+				}
+			}
+			e.encodeString(*(*string)(unsafe.Pointer(&bytes)))
+			code = code.next
+			c.nextField.ptr = c.ptr
 		case opStructEnd:
 			e.encodeByte('}')
 			code = code.next