JWT library

jwt.js

/**
 * @description Checks if JWT Token has expired
 * @param {string} token
 *
 * @return {boolean}
 */
const isTokenExpired = token => {
  /** @type {string[]} */
  const parts = token.split(".");
  /** @type {number} */
  const { exp } = JSON.parse(atob(parts[1]));

  if (exp === undefined) {
    throw Error("No exp flag.");
  }
  /** @type {number} */
  const currentTime = Date.now() / 1000;

  return currentTime > exp;
};