Generate an expired JWT in Nodejs.

GENERATE_EXPIRED_JWT.ts

import * as jwt from 'jsonwebtoken';

export class PastJWTGenerator {
  protected jwtSecret: string = 'jwt-secret';
  protected expiresIn: number = 60 * 60 * 3; // three hours

  // secondsInPast: number of seconds to move back in the past from where token must be issued.
  generate(claims: any, secondsInPast: number, secondsToExpireIn?: number) {
    const data = {
      ...claims,
      iat: Math.floor(Date.now() / 1000) - secondsInPast,
    };

    return jwt.sign(data, jwtSecret, {
      expiresIn: secondsToExpireIn ? secondsToExpireIn : this.expiresIn,
    });
  }
}