How can I validate data before inserting it into MySQL using Node.js?

How can I validate data before inserting it into MySQL using Node.js?

You can use libraries like Joi or express-validator to validate data in Node.js before inserting it into MySQL.

Can you show me an example using Joi?

Sure! First, install Joi using npm. Then, you can create a schema to validate your data like this:

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 {
  // Proceed to insert data into MySQL
}

What if the validation fails?

If the validation fails, Joi will return an error object that contains details about what went wrong. You can handle this by checking the error and responding accordingly.