Understanding REST API Design Best Practices

A REST API is a contract. Every decision you make when designing it — URL structure, status codes, error formats, versioning — becomes a constraint your consumers must work around. Get it right upfront, and integration is smooth. Get it wrong, and you'll be maintaining backwards-compatibility hacks for years. Here's what separates a well-designed REST API from a frustrating one. Think in Resources, Not Actions REST is resource-oriented. URLs identify things, HTTP methods express what you're doing to them. # Wrong — action-based URLs POST /createUser GET /getUserById?id=42 POST /deleteUser POST /updateUserEmail # Right — resource-based URLs POST /users # create a user GET /users/42 # get a specific user DELETE /users/42 # delete a user PATCH /users/42 # partially update a user The HTTP method carries the semantic meaning. Your URL should only identify what resource is being acted on. Nested Resources Use nesting for resources that belong to a parent: GET /users/42/orders # all orders fo