From 4cae8f7bc7a3294312a23445018e085d1de66abb Mon Sep 17 00:00:00 2001
From: Will Roden <willabides@github.com>
Date: Tue, 6 Apr 2021 16:15:07 -0500
Subject: [PATCH] update Valid to return false when there is additional data
 after the validated value

---
 json.go      | 9 +++++++--
 json_test.go | 1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/json.go b/json.go
index 3d879d0..05756ef 100644
--- a/json.go
+++ b/json.go
@@ -333,8 +333,13 @@ func HTMLEscape(dst *bytes.Buffer, src []byte) {
 // Valid reports whether data is a valid JSON encoding.
 func Valid(data []byte) bool {
 	var v interface{}
-	if err := Unmarshal(data, &v); err != nil {
+	decoder := NewDecoder(bytes.NewReader(data))
+	err := decoder.Decode(&v)
+	if err != nil {
 		return false
 	}
-	return true
+	if !decoder.More() {
+		return true
+	}
+	return decoder.InputOffset() >= int64(len(data))
 }
diff --git a/json_test.go b/json_test.go
index a73db50..9470ed1 100644
--- a/json_test.go
+++ b/json_test.go
@@ -20,6 +20,7 @@ var validTests = []struct {
 	{`{}`, true},
 	{`{"foo":"bar"}`, true},
 	{`{"foo":"bar","bar":{"baz":["qux"]}}`, true},
+	{`[""],`, false},
 }
 
 func TestValid(t *testing.T) {