Introduction to is-my-json-valid

JSON validation is essential for ensuring the integrity and reliability of data exchanged between systems. is-my-json-valid is a powerful and efficient JSON schema validator that helps developers effortlessly validate JSON data against defined schemas.

Getting Started with is-my-json-valid

Installing the library is straightforward. You can add it to your project using npm:

  npm install is-my-json-valid

Basic Validation Example

Here’s a simple example of how to use is-my-json-valid to validate a JSON object:

   const validator = require('is-my-json-valid');

   const validate = validator({
     type: 'object',
     properties: {
       name: { type: 'string' },
       age: { type: 'integer', minimum: 18 }
     },
     required: ['name', 'age']
   });

   console.log(validate({ name: 'John Doe', age: 27 })); // true
   console.log(validate({ name: 'John Doe', age: 17 })); // false
   console.log(validate.errors); // Contains validation errors

Custom Formats

You can define custom formats to extend validation capabilities:

   const validator = require('is-my-json-valid');

   const validate = validator({
     type: 'object',
     properties: {
       email: { type: 'string', format: 'email' }
     }
   }, {
     formats: {
       email: /^\S+@\S+$/
     }
   });

   console.log(validate({ email: 'test@example.com' })); // true
   console.log(validate({ email: 'invalid-email' })); // false

Asynchronous Validation

Asynchronous validation can be conducted using callbacks or promises:

   const validator = require('is-my-json-valid/async');

   const validate = validator({
     type: 'object',
     properties: {
       url: { type: 'string', format: 'url' }
     }
   });

   validate({ url: 'http://example.com' }, function(err, valid) {
     if (err) throw err;
     console.log(valid); // true
   });

Comprehensive Example Application

Let’s build a small application that accepts user profiles and validates them before processing:

   const express = require('express');
   const bodyParser = require('body-parser');
   const validator = require('is-my-json-valid');

   const app = express();
   app.use(bodyParser.json());

   const validateProfile = validator({
     type: 'object',
     properties: {
       username: { type: 'string', minLength: 3 },
       email: { type: 'string', format: 'email' },
       age: { type: 'integer', minimum: 18 }
     },
     required: ['username', 'email', 'age']
   });

   app.post('/profile', (req, res) => {
     if (validateProfile(req.body)) {
       res.send('Profile is valid');
     } else {
       res.status(400).json({ errors: validateProfile.errors });
     }
   });

   app.listen(3000, () => {
     console.log('Server is running on port 3000');
   });

In this application, user profiles are validated against a schema, and appropriate responses are provided based on the validation results.

Conclusion

The is-my-json-valid library is an invaluable tool for developers needing efficient and versatile JSON validation. Whether you are working with simple data structures or complex objects, is-my-json-valid ensures your JSON data meets the specified criteria, thereby enhancing the reliability of your applications.

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