Regarding JWT token based authentication.

I use jwt-decode package for decoding JWT token in angular 5; this package work me fine.

after install package through this command:

npm install jwt-decode

import this package into your TypeScript class through this syntax:

import * as jwt_decode from "jwt-decode";

and use this library method for decoding your access token like this

getDecodedAccessToken(token: string): any {

try{

return jwt_decode(token);

}

catch(Error){

return null;

}

}

token parameter define your access token which get from your API

jwt_decode method return decoded token info as an object; you can access any info into your token.

Example:

let tokenInfo = this.getDecodedAccessToken(token); // decode token

let expireDate = tokenInfo.exp; // get token expiration dateTime

console.log(tokenInfo); // show decoded token object in console

jwt-decode is a small browser library that helps decoding JWTs token which are Base64Url encoded.

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.

Please accept the answer If it helps