How do I use Joi for validation in my Node.js application?

How do I use Joi for validation in my Node.js application?

You can use Joi by first installing it via npm. Then, you can create a schema to define the structure of your data.

Can you show me a simple example of a Joi schema?

Sure! Here's a basic example:

const Joi = require('joi');

const schema = Joi.object({
  name: Joi.string().min(3).required(),
  age: Joi.number().integer().min(0).required()
});

This schema requires a name and age.

How do I validate data against this schema?

You can validate data using the validate method:

const result = schema.validate({ name: 'John', age: 25 });
if (result.error) {
  console.error(result.error.details);
} else {
  console.log('Validation successful!');
}