A well-designed API is a joy to work with. It's intuitive, consistent, and does exactly what you expect. In this guide, we'll cover the essential principles that make APIs great.

Resource Naming

Use nouns, not verbs, for resource names. Resources should represent things, not actions. Use plural nouns for collections and maintain consistency throughout your API.

• Use /users instead of /getUsers
• Use /orders/123 instead of /getOrder?id=123
• Keep URLs lowercase with hyphens for readability
• Avoid deeply nested resources when possible

HTTP Methods

Use HTTP methods semantically. GET for retrieval, POST for creation, PUT/PATCH for updates, and DELETE for removal. This makes your API predictable and aligns with HTTP specifications.

The best API is one that a developer can understand without reading the documentation.

Status Codes

Return appropriate HTTP status codes. 2xx for success, 4xx for client errors, 5xx for server errors. Be specific—use 201 for created, 204 for no content, 400 for bad request, 404 for not found.

Versioning

Plan for versioning from the start. Whether you use URL versioning (/v1/users), header versioning, or query parameters, consistency is key. Make breaking changes in new versions.

Error Handling

Provide meaningful error responses. Include an error code, a human-readable message, and optionally details about what went wrong. Consistent error formats make debugging easier for API consumers.