How can I validate JSON data fetched from an API?

How can I validate JSON data fetched from an API?

You can validate JSON data using libraries like Ajv or Joi in JavaScript. Would you like a code example?

Yes, please provide a code example using Ajv.

Sure! Here's a simple example:

const Ajv = require('ajv');
const ajv = new Ajv();

const schema = {
  type: 'object',
  properties: {
    name: { type: 'string' },
    age: { type: 'integer' }
  },
  required: ['name', 'age']
};

const validate = ajv.compile(schema);

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

if (!valid) console.log(validate.errors);
else console.log('Data is valid!');

This will check if the data matches the schema.

What if the data doesn't match the schema?

If the data doesn't match, the validate.errors will contain an array of error messages explaining what went wrong.