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HTML 

              
                <html>

<head>
  <title>Creating Json Web Token (JWT) with Javascript</title>
</head>

<body class="p-2">
  <div class="flex flex-row">
    <div style="width: 25%;">
      <h2 class="p-1 text-lg font-bold border-b border-gray-100">Token properties</h2>
      <p class="p-2">
        You can find more info about Json Web Tokens at <a href="https://pdfgeneratorapi.com" targer="_blank">https://jwt.io/</a>.
      </p>
      <form class="m-4">
        <div class="space-y-4">
          <div>
            <label for="iss" class="block font-medium">iss (issuer)</label>
            <input type="text" name="iss" id="iss" class="block rounded ring-1 ring-inset ring-gray-300 p-1" placeholder="iss (issuer)">
          </div>
          <div>
            <label for="sub" class="block font-medium">sub (subject)</label>
            <input type="text" name="sub" id="sub" class="block rounded ring-1 ring-inset ring-gray-300 p-1" placeholder="sub (subject)">
          </div>
          <div>
            <label for="secret" class="block font-medium">secret (not base64 encoded)</label>
            <input type="text" name="secret" id="secret" class="block rounded ring-1 ring-inset ring-gray-300 p-1" placeholder="secret (not base64 encoded)">
          </div>
        </div>
        <div class="mt-4">
          <button type="button" id="create-token-btn" class="rounded-md bg-indigo-600 px-3 py-2 text-sm font-semibold text-white shadow-sm hover:bg-indigo-500 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-indigo-600">Create token</button>
        </div>
      </form>
    </div>
    <div style="width: 75%;">
      <h2 class="p-1 text-lg font-bold border-b border-gray-100">Token</h2>
      <p class="p-2">Toke will appare here.</p>
      <div class="p-2 italic" id="token-placeholder"></div>
    </div>
  </div>
</body>

</html>
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CSS
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JS 

              
                import * as jose from "https://cdn.skypack.dev/jose@4.13.1";

document.querySelector("#create-token-btn").addEventListener("click", (event) => {
  createJsonWebToken(
    document.querySelector("#iss").value,
    document.querySelector("#sub").value,
    document.querySelector("#secret").value
  ).then((token) => {
    document.querySelector('#token-placeholder').innerHTML = token;
  });
});

async function createJsonWebToken(iss, sub, secret) {
  const header = {
    alg: "HS256",// Token generation algorithm
    typ: "JWT"
  };

  const payload = {
    iss: iss,
    sub: sub,
    exp: Math.round(Date.now() / 1000) + 60 // token is valid for 60 seconds
  };

  return await new jose.SignJWT(payload)
    .setProtectedHeader(header)
    .sign(new TextEncoder().encode(secret));
}
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999px

Console