How can I validate email addresses in Express using express-validator?

How can I validate email addresses in Express using express-validator?

You can use the check function from express-validator to validate email addresses. Here's a simple example.

Can you show me a code snippet for that?

Sure! Here's a basic example:

const { check, validationResult } = require('express-validator');

app.post('/register', [
  check('email').isEmail().withMessage('Please enter a valid email address'),
], (req, res) => {
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(400).json({ errors: errors.array() });
  }
  // Proceed with registration
});

What if the email is already in use?

You can add a custom validator to check if the email exists in your database before proceeding with registration.