What are the best practices for using Express Validator?

What are the best practices for using Express Validator in my Node.js application?

When using Express Validator, it's important to validate inputs early, use middleware for validation, and handle errors gracefully.

Can you give me an example of how to set up validation middleware?

Sure! You can set up validation middleware like this:

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

app.post('/user', [
  body('email').isEmail(),
  body('password').isLength({ min: 5 })
], (req, res) => {
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(400).json({ errors: errors.array() });
  }
  // Proceed with user creation
});

How do I handle validation errors in my response?

You can handle validation errors by checking the result of validationResult(req) and sending a response with the errors if any are found.

Are there any specific rules or patterns I should follow?

Yes, always validate user inputs, keep your validation logic separate from your business logic, and use custom validators when necessary.