REST API Design Best Practices That Scale

A well-designed API is a joy to work with. Here are the principles I follow when designing APIs that developers love and that scale.

Resource-Oriented Design

Think in resources, not actions. URLs should represent nouns, not verbs.

Good: GET /users/123 Bad: GET /getUser?id=123

Use HTTP methods to express actions: - GET: Retrieve resources - POST: Create resources - PUT/PATCH: Update resources - DELETE: Remove resources

Consistent Naming

Use consistent naming conventions: - Plural nouns for collections: /users, /orders - Kebab-case for multi-word resources: /order-items - Consistent response structure across endpoints

Versioning

Version your API from day one. Options include:

• URL path: /v1/users
• Header: Accept: application/vnd.api+json;version=1

I prefer URL versioning for visibility and simplicity.

Pagination

Always paginate list endpoints. Include metadata about total count and next/previous pages.

Support both offset and cursor pagination. Cursor pagination performs better for large datasets.

Error Handling

Return consistent error responses with: - HTTP status code (400, 404, 500) - Error code for programmatic handling - Human-readable message - Details for validation errors

Rate Limiting

Protect your API with rate limits. Return rate limit info in headers so clients can handle limits gracefully.

Documentation

Document every endpoint with: - Description - Request parameters - Response schema - Example requests/responses - Error cases

OpenAPI/Swagger makes documentation interactive and enables code generation.

Good API design requires upfront investment but pays off in reduced support burden and better developer experience.