How can I validate JSON data in Node.js?

How can I validate JSON data in Node.js?

You can use libraries like Joi or Ajv to validate JSON data in Node.js. Would you like an example?

Yes, please provide an example using Joi.

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

const Joi = require('joi');

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

const data = { name: 'John', age: 30 };
const validation = schema.validate(data);

if (validation.error) {
  console.error(validation.error.details);
} else {
  console.log('Validation successful!');
}

What if the JSON data doesn't match the schema?

If the JSON data doesn't match the schema, Joi will return an error object containing details about the validation failure.