This example shows an order-service application built with React, managing order data through a PostgreSQL database via Sequelize and Express. The code defines REST API endpoints for creating, retrieving, and updating orders, using JSON validation with Ajv and TypeBox schemas. It integrates RabbitMQ through amqplib for message queuing, JWT token verification for authentication, and includes comprehensive Jest testing with nock for HTTP mocking and Sinon for spies. The visualization demonstrates a server-side Node.js architecture with async/await patterns, error handling middleware, and logging.