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How to decode jwt token in javascript without using a library?

Hello Guys, How are you all? Hope You all Are Fine. Today we are going to learn How to decode jwt token in javascript without using a library? in javascript. So Here I am Explain to you all the possible methods here.

Without wasting your time, Let’s start This Article.

How to decode jwt token in javascript without using a library ?

  1. How to decode jwt token in javascript without using a library ?

    to decode jwt token in javascript without using a library all features of jwt.io doesn't support all languages. In NodeJs you can use
    var decoded = jwt.decode(token);

  2. How to decode jwt token in javascript without using a library ?

    to decode jwt token in javascript without using a library all features of jwt.io doesn't support all languages. In NodeJs you can use
    var decoded = jwt.decode(token);

Method 1

Working unicode text JWT parser function:

function parseJwt (token) {
    var base64Url = token.split('.')[1];
    var base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
    var jsonPayload = decodeURIComponent(atob(base64).split('').map(function(c) {
        return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
    }).join(''));

    return JSON.parse(jsonPayload);
};

Method 2

all features of jwt.io doesn’t support all languages. In NodeJs you can use

var decoded = jwt.decode(token);

Summery

It’s all About this article. Hope all method helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which method worked for you? Thank You.

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