auth.js

const passport = require('passport');
const { Strategy, ExtractJwt } = require('passport-jwt')

module.exports = app => {
    const Users = app.db.models.Users;
    const config = app.libs.config;

    const params = {
        jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
        secretOrKey: config.jwtSecret
    };

    const strategy = new Strategy(params, async (payload, done) => {
        try { 
            const user = await Users.findById(payload.id);
            if (user) { 
                return done(null, {
                    id: user.id,
                    email: user.email
                });
            } else { 
                return done(null, false);
            }
        } catch (error) { 
            return done(error, null);
        }
    });

    passport.use(strategy);

    return {
        initialize: () => { 
            return passport.initialize();
        },
        authenticate: () => { 
            return passport.authenticate('jwt', config.jwtSession);
        }
    }
};