api/strategies/jwtStrategy.js

const { Strategy: JwtStrategy, ExtractJwt } = require('passport-jwt');
const User = require('../models/User');

// JWT strategy
const jwtLogin = async () =>
  new JwtStrategy(
    {
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      secretOrKey: process.env.JWT_SECRET,
    },
    async (payload, done) => {
      try {
        const user = await User.findById(payload.id);
        if (user) {
          done(null, user);
        } else {
          console.log('JwtStrategy => no user found');
          done(null, false);
        }
      } catch (err) {
        done(err, false);
      }
    },
  );

module.exports = jwtLogin;