JWT utility library for Angular 6

jwt-util.ts

import { Injectable } from '@angular/core';

@Injectable()
export class JWTUtil {

    constructor() { }

    decodeToken(accessToken: string) {
        let base64Url = accessToken.split('.')[1];
        let base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
        let JwtDecode = JSON.parse(window.atob(base64));
        console.info("Decoded Token: ", JwtDecode);
        return JwtDecode
    }

    expirationTime(accessToken: string): number {
        let parseJwt = this.decodeToken(accessToken);
        let expTime = parseJwt.exp;
        return expTime
    }

    isExpired(accessToken: string): Boolean {
        let expTime = this.expirationTime(accessToken);
        console.log("Expiration time: ", expTime, new Date(expTime))
        let currentTimeInMilli = new Date().getTime();
        console.log("Current time: ", currentTimeInMilli, new Date(currentTimeInMilli))
        if (expTime < currentTimeInMilli) {
            console.warn("Token Expired!")
            return true
        }
        return false
    }
}