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JwtDecoder.html
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JwtDecoder.html
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<!DOCTYPE html>
<html>
<head>
<title>JWT Decoder</title>
<!-- Also at: https://codesandbox.io/s/jwt-decoder-qejue -->
<!-- <script src="https://cdn.jsdelivr.net/npm/[email protected]/build/jwt-decode.min.js"></script> -->
<!-- <script src="https://raw.githubusercontent.com/auth0/jwt-decode/master/build/jwt-decode.min.js"></script> -->
<script>
// https://www.npmjs.com/package/jwt-decode
// https://github.com/auth0/jwt-decode/blob/master/build/jwt-decode.js
// https://www.jsdelivr.com/package/npm/jwt-decode
// v3.1.2
!function(e){"function"==typeof define&&define.amd?define(e):e()}((function(){"use strict";function e(e){this.message=e}e.prototype=new Error,e.prototype.name="InvalidCharacterError";var n="undefined"!=typeof window&&window.atob&&window.atob.bind(window)||function(n){var t=String(n).replace(/=+$/,"");if(t.length%4==1)throw new e("'atob' failed: The string to be decoded is not correctly encoded.");for(var r,o,i=0,a=0,d="";o=t.charAt(a++);~o&&(r=i%4?64*r+o:o,i++%4)?d+=String.fromCharCode(255&r>>(-2*i&6)):0)o="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".indexOf(o);return d};function t(e){var t=e.replace(/-/g,"+").replace(/_/g,"/");switch(t.length%4){case 0:break;case 2:t+="==";break;case 3:t+="=";break;default:throw"Illegal base64url string!"}try{return function(e){return decodeURIComponent(n(e).replace(/(.)/g,(function(e,n){var t=n.charCodeAt(0).toString(16).toUpperCase();return t.length<2&&(t="0"+t),"%"+t})))}(t)}catch(e){return n(t)}}function r(e){this.message=e}function o(e,n){if("string"!=typeof e)throw new r("Invalid token specified");var o=!0===(n=n||{}).header?0:1;try{return JSON.parse(t(e.split(".")[o]))}catch(e){throw new r("Invalid token specified: "+e.message)}}r.prototype=new Error,r.prototype.name="InvalidTokenError",window&&("function"==typeof window.define&&window.define.amd?window.define("jwt_decode",(function(){return o})):window&&(window.jwt_decode=o))}));
</script>
</head>
<body>
<h3 class="title">JWT DECODER</h3>
<h5 class="subtitle">Decode safely without sending the token to an external 3th party server.</h5>
<div class="app-menu">
<a href="https://github.com/LazaroOnline/Jwt-Decoder">
<svg height="32" width="32" viewBox="0 0 16 16" style="fill:chartreuse">
<path fill-rule="evenodd" d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0 0 16 8c0-4.42-3.58-8-8-8z"></path>
</svg>
</a>
</div>
<span>Token:</span>
<textarea id="txtToken" oninput='setAutoHeight(this)'></textarea>
<button type="button" id="btnDecode">Decode</button>
<br/>
<span>Decoded Header:</span>
<textarea id="txtDecodedHeader" readonly></textarea>
<span>Decoded Payload:</span>
<textarea id="txtDecodedPayload" readonly></textarea>
</body>
</html>
<style>
/* Dark theme */
body,
input,
button,
textarea {
font-family: monospace;
background-color: #111;
color: chartreuse;
}
button,
input,
textarea {
background-color: #222;
}
input,
textarea {
border: 0;
}
/* Layout */
.title {
float: left;
margin: 0;
margin-right: 20px;
font-size: 20px;
}
.subtitle {
font-size: 12px;
margin: 0;
margin-right: 30px;
padding: 5px;
}
.app-menu {
position: absolute;
right: 5px;
top: 5px;
}
#txtToken {
height: 120px;
}
#txtDecodedPayload,
#txtDecodedHeader,
#txtToken
{
width: 100%;
}
#btnDecode {
width: 300px;
margin: 0 auto;
text-align: center;
display: block;
}
.txt-console textarea,
.txt-console input {
font-family: monospace !important;
color: gray !important;
max-width: 100%;
}
.txt-error {
background-color: rgba(255, 0, 0, 0.15);
}
</style>
<script>
// VAINILLA JS:
var token = ""
document.querySelector('#txtToken').value = token
var errorClass = 'txt-error'
function decodeJwt(txtId, header = false) {
var txtDecoded = document.querySelector('#'+txtId)
var token = txtToken.value
//txtToken.classList.remove(errorClass)
txtDecoded.classList.remove(errorClass)
var decoded = null
try {
decoded = jwt_decode(token, { header: header })
} catch(ex) {
txtDecoded.classList.add(errorClass)
//txtToken.classList.add(errorClass)
// alert('Can not decode token:\r\n' + token)
decoded = "ERROR DECODING: " + ex
}
console.log(decoded)
txtDecoded.value = JSON.stringify(decoded, null, 2)
setAutoHeight(txtDecoded)
}
document.querySelector('#btnDecode').onclick = function() {
var txtToken = document.querySelector('#txtToken')
decodeJwt('txtDecodedHeader', true)
decodeJwt('txtDecodedPayload', false)
}
function setAutoHeight(txtElement) {
txtElement.style.height = ""
txtElement.style.height = txtElement.scrollHeight + "px"
}
</script>