API Implementation

API Implementation

A REST API is the connection between front-end and back-end: resource-oriented URLs, the right HTTP method for each action (GET, POST, PUT/PATCH, DELETE), and consistent JSON responses with appropriate status codes. Routing and controllers make sure incoming requests reach the right logic, and handling invalid input and errors gracefully keeps the API predictable for whoever consumes it.

Starting Points

• MDN Web Docs. REST — Glossary.
• MDN Web Docs. HTTP messages.
• MDN Web Docs. HTTP response status codes.
• API design and contract-first development

Key Points

• You design and implement a small REST API with clear resource URLs (e.g. /users, /users/{id}) supporting basic CRUD operations with the appropriate HTTP methods.
• You implement controller/handler functions and routing so incoming requests are dispatched to the right logic based on path and method.
• You return JSON responses with a consistent structure and suitable HTTP status codes (e.g. 200 OK, 201 Created, 400 Bad Request, 404 Not Found, 500 Internal Server Error).
• You handle invalid input and simple errors gracefully, and can explain how these are communicated to clients via status codes and JSON error bodies.