How to decode JSON Web Token (JWT) offline

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Written by - Millan Kaul

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JSON Web Token (JWT) is pronounced as “jot”

I will show you How to decode jwt token using postman in 2 minutes !!

Most of the developers and QA have pasted jwt tokens on https://jwt.io as nothing else seems more reliable than that to copy your secrets. But its less of a fact that we read this on the same website

Warning: JWTs are credentials, which can grant access to resources. Be careful where you paste them! We do not record tokens, all validation and debugging is done on the client side.

screenshot of decoding JWT token from jwt.io

Postman Test tab

var jwt_token = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c'

var one = JSON.parse(atob(jwt_token.split('.')[0]));
var two = JSON.parse(atob(jwt_token.split('.')[1]));
var three = jwt_token.split('.')[2];

console.log (one);
console.log (two);
console.log (three);

And you will see this in the result tab at bottom

pm.test('one -----> ' + JSON.stringify(one), function () {});
pm.test('two -----> ' + JSON.stringify(two), function () {});
pm.test('three ---> ' + three, function () {});

Test Result tab showing decoded values of jwt token 

Image with values of decoded JWT token