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I have defined my JWTService as below! Hope it helps. It is in TypeScript but can be used in vanilla javascript by just copying the code.

import { Injectable } from "@angular/core"; @Injectable() export class JWTService { private chars: string = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='; private atob(input) { var str = String(input).replace(/=+$/, ''); if (str.length % 4 == 1) { throw new Error("'atob' failed: The string to be decoded is not correctly encoded."); } for ( // initialize result and counters var bc = 0, bs, buffer, idx = 0, output = ''; // get next character buffer = str.charAt(idx++); // character found in table? initialize bit storage and add its ascii value; ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer, // and if not first of each 4 characters, // convert the first 8 bits to one ascii character bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0 ) { // try to find character in table (0-63, not found => -1) buffer = this.chars.indexOf(buffer); } return output; }; parseJwt(token) { var base64Url = token.split('.')[1]; var base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/'); var jsonPayload = decodeURIComponent(this.atob(base64).split('').map(function (c) { return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2); }).join('')); return JSON.parse(jsonPayload); }; }