Jsonwebtoken jwt token generation and verification with express js framework

auth.ts

import { RequestHandler } from "express";
import jwt, { Secret } from "jsonwebtoken";

import { errors } from "@util/locale/errors";

export const generateToken = (userId: string) =>
  jwt.sign(userId, process.env.SECRET as Secret);

export const verifyToken = (async (req, res, next) => {
  const bearerHeader = req.headers["authorization"] as string;

  if (!bearerHeader) {
    const err: Error = new Error(errors.authentication.tokenNotProvided);
    err.statusCode = 500;
    next(err);
  } else {
    const bearer = bearerHeader.split(" ");
    const bearerToken = bearer[1];
    try {
      jwt.verify(bearerToken, process.env.SECRET as Secret);
      next();
    } catch (e) {
      const err: Error = new Error(errors.authentication.tokenNotVerified);
      err.statusCode = 500;
      next(err);
    }
  }
}) as RequestHandler;