How do I set up user login in an Express application?

How do I set up user login in an Express application?

To set up user login in an Express app, you'll need to use middleware like Passport.js for authentication.

What are the steps to integrate Passport.js?

First, install Passport and its strategies. Then, configure it in your Express app and set up routes for login.

Do I need to store user passwords in the database?

Yes, but make sure to hash passwords using bcrypt before storing them for security.

Can you show me a code example?

Sure! Here's a simple example:

const bcrypt = require('bcrypt');
const passport = require('passport');

app.post('/login', (req, res, next) => {
  passport.authenticate('local', (err, user, info) => {
    if (err) { return next(err); }
    if (!user) { return res.redirect('/login'); }
    req.logIn(user, (err) => {
      if (err) { return next(err); }
      return res.redirect('/dashboard');
    });
  })(req, res, next);
});