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<h1 id="creating-a-new-jwt">Creating a New JWT</h1>
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<p>One of the primary goals of this library is to create a new JWT (or in short
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<em>token</em>).</p>
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<h2 id="with-default-options">With Default Options</h2>
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<p>The easiest way to create a token is to use the
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<a href="https://pkg.go.dev/github.com/golang-jwt/jwt/v5#New"><code>jwt.New</code></a> function. It
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then needs one of the available <a href="../signing_methods/">signing methods</a>, to
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finally sign and convert the token into a string format (using the
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<a href="https://pkg.go.dev/github.com/golang-jwt/jwt/v5#Token.SignedString"><code>SignedString</code></a>
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method). In the first example, we are using a <strong>symmetric</strong> signing method, i.e.,
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HS256. For a symmetric method, both the signing and the verifying key are the
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same and thus, both must be equally protected (and should definitely NOT be
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stored in your code).</p>
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<div class="language-go highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kd">var</span><span class="w"> </span><span class="p">(</span>
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</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="w"> </span><span class="nx">key</span><span class="w"> </span><span class="p">[]</span><span class="kt">byte</span>
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</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="w"> </span><span class="nx">t</span><span class="w"> </span><span class="o">*</span><span class="nx">jwt</span><span class="p">.</span><span class="nx">Token</span>
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</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="nx">s</span><span class="w"> </span><span class="kt">string</span>
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</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="p">)</span>
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</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a>
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</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="nx">key</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="cm">/* Load key from somewhere, for example an environment variable */</span>
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</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="nx">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nx">jwt</span><span class="p">.</span><span class="nx">New</span><span class="p">(</span><span class="nx">jwt</span><span class="p">.</span><span class="nx">SigningMethodHS256</span><span class="p">)</span><span class="w"> </span><span class="c1">// (1)!</span>
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</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="nx">s</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nx">t</span><span class="p">.</span><span class="nx">SignedString</span><span class="p">(</span><span class="nx">key</span><span class="p">)</span><span class="w"> </span><span class="c1">// (2)!</span>
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</span></code></pre></div>
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<ol>
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<li>This initializes a new
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<a href="https://pkg.go.dev/github.com/golang-jwt/jwt/v5#Token"><code>jwt.Token</code></a> struct
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based on the supplied signing method. In this case a <strong>symmetric</strong> method is
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chosen.</li>
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<li>This step computes a cryptographic signature based on the supplied key. </li>
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</ol>
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<p>Signing using an <em>asymmetric</em> signing method (for example ECDSA) works quite
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similar. For an <strong>asymmetric</strong> method, the private key (which must be kept
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secret) is used to <em>sign</em> and the corresponding public key (which can be freely
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transmitted) is used to <em>verify</em> the token.</p>
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<div class="language-go highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kd">var</span><span class="w"> </span><span class="p">(</span>
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</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="w"> </span><span class="nx">key</span><span class="w"> </span><span class="o">*</span><span class="nx">ecdsa</span><span class="p">.</span><span class="nx">PrivateKey</span>
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</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="nx">t</span><span class="w"> </span><span class="o">*</span><span class="nx">jwt</span><span class="p">.</span><span class="nx">Token</span>
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</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="nx">s</span><span class="w"> </span><span class="kt">string</span>
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</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="p">)</span>
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</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a>
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</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="nx">key</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="cm">/* Load key from somewhere, for example a file */</span>
|
|
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="nx">t</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nx">jwt</span><span class="p">.</span><span class="nx">New</span><span class="p">(</span><span class="nx">jwt</span><span class="p">.</span><span class="nx">SigningMethodES256</span><span class="p">)</span><span class="w"> </span><span class="c1">// (1)!</span>
|
|
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="nx">s</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="nx">t</span><span class="p">.</span><span class="nx">SignedString</span><span class="p">(</span><span class="nx">key</span><span class="p">)</span><span class="w"> </span><span class="c1">// (2)!</span>
|
|
</span></code></pre></div>
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|
<ol>
|
|
<li>This initializes a new <a href="https://pkg.go.dev/github.com/golang-jwt/jwt/v5#Token"><code>jwt.Token</code></a> struct based on the supplied signing method. In this case a <strong>asymmetric</strong> method is chosen.</li>
|
|
<li>This step computes a cryptographic signature based on the supplied private
|
|
key.</li>
|
|
</ol>
|
|
<p>Note, that the chosen signing method and the type of key must match. Please refer to <a href="../signing_methods/">Signing Methods</a> for a complete overview.</p>
|
|
<h2 id="with-additional-claims">With Additional Claims</h2>
|
|
<h2 id="with-options">With Options</h2>
|
|
<p>While we already prepared a
|
|
<a href="https://pkg.go.dev/github.com/golang-jwt/jwt/v5#TokenOption"><code>jwt.TokenOption</code></a>
|
|
type, which can be supplied as a varargs to
|
|
<a href="https://pkg.go.dev/github.com/golang-jwt/jwt/v5#New"><code>jwt.New</code></a> and
|
|
<a href="https://pkg.go.dev/github.com/golang-jwt/jwt/v5#NewWithClaims"><code>jwt.NewWithClaims</code></a>,
|
|
these are strictly for future compatibility and are currently not used.</p>
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