snippets/javascript/decode-jwt-token/

[giscus[bot]]

snippets/javascript/decode-jwt-token/

Get JWT token payload using JavaScript Buffer

https://www.abhith.net/snippets/javascript/decode-jwt-token/

[TanmayCreations]

Uncaught ReferenceError: Buffer is not defined

[abhith]

The Buffer object is a built-in Node.js global object and is not available in the browser environment by default. This is why you are seeing the "Uncaught ReferenceError: Buffer is not defined" error when running your code in the browser.

To decode a JWT in a browser environment, you can use the atob() function and the JSON.parse() method instead of the Buffer object. The atob() function is a built-in browser function that decodes a base64-encoded string, and the JSON.parse() method converts a JSON string into a JavaScript object.

Here's an example of how you can decode a JWT in a browser environment using atob() and JSON.parse():

function decodeJwt(token) {
  var base64Payload = token.split(".")[1];
  var payload = decodeURIComponent(
    atob(base64Payload)
      .split("")
      .map(function (c) {
        return "%" + ("00" + c.charCodeAt(0).toString(16)).slice(-2);
      })
      .join("")
  );
  return JSON.parse(payload);
}