jwt-decode-es

jwt-decode-es is a small browser library that helps decoding JWTs token which are Base64Url encoded. This is a fork of jwt-decode library which is not really supported.

IMPORTANT: This library doesn't validate the token, any well formed JWT can be decoded. You should validate the token in your server-side logic by using something like express-jwt, koa-jwt, Owin Bearer JWT, etc.

Installation

Install with npm npm i --save jwt-decode-es

In comparison with jwt-decode, it provides ES, UMD and CJS modules and has latest build dependencies with fixed vulnerbilities. It uses rollup bundler with terser plugin to minify sources. Current version is just 1.25 Kb for minified .mjs version.

Usage

import { jwt_decode } from "jwt-decode-es";
const token = "eyJ0eXAiO.../// jwt token";
 
const decoded = jwt_decode(token);
console.log(decoded);
 
/* prints:
 * { foo: "bar",
 *   exp: 1393286893,
 *   iat: 1393268893  }
 */
 
// decode header by passing in options (useful for when you need `kid` to verify a JWT):
const decodedHeader = jwt_decode(token, { header: true });
console.log(decodedHeader);
 
/* prints:
 * { typ: "JWT",
 *   alg: "HS256" }
 */

Note: A falsy or malformed token will throw an InvalidTokenError error.

Include with a script tag

Copy the file jwt-decode.min.js from the build/ folder to your project somewhere, then include like so:

<script src="jwt-decode.min.js"></script>
 
<script>
  var jwt_decode = jwt_decode_es.jwt_decode;
  var token = "eyJ0eXAiO.../// jwt token";
  var decoded = jwt_decode(token);
  console.log(decoded);
</script> 

Author

Initial author Auth0 Updated to modern platform by Alexey Petushkov

License

This project is licensed under the MIT license. See the LICENSE file for more info.