How can I implement data validation in my MERN application?

How can I implement data validation in my MERN application?

You can use libraries like Joi or express-validator for data validation in your MERN stack. Would you like a code example?

Yes, please provide a code example using Joi.

Sure! Here's a simple example:

const Joi = require('joi');

const schema = Joi.object({
  name: Joi.string().min(3).required(),
  email: Joi.string().email().required(),
});

const { error } = schema.validate({ name: 'John', email: '[email protected]' });
if (error) {
  console.log(error.details[0].message);
} else {
  console.log('Validation successful!');
}

What if the validation fails?

If validation fails, Joi will return an error object containing details about what went wrong. You can handle this in your application to provide feedback to the user.