What is API Design Principles?
API design principles are guidelines for creating APIs that are intuitive, consistent, and developer-friendly.
API design principles are guidelines for creating APIs that are intuitive, consistent, and developer-friendly. Good API design reduces integration time, lowers support burden, and increases platform adoption.
Core principles: Resource-oriented design (nouns in URLs: /users, /orders — not verbs: /getUsers), Consistent naming conventions (camelCase or snake_case, pick one), Meaningful HTTP status codes (200 success, 201 created, 400 bad request, 404 not found, 429 rate limited), Pagination for collections, Filtering and sorting via query parameters, and Comprehensive error responses (error code, message, documentation link).
API design review checklist: Is it intuitive (can a developer guess the endpoint without docs)? Is it consistent (same patterns everywhere)? Is it secure (authentication, authorization, input validation)? Is it evolvable (versioning strategy, backward compatibility)?
Why It Matters
APIs are the product for platform businesses. A well-designed API reduces time-to-integration by 5-10x. Poor API design creates permanent support burden because breaking changes require versioning.
Frequently Asked Questions
What makes a good API?
Intuitive resource naming, consistent patterns, meaningful status codes, pagination, filtering, comprehensive errors, and clear documentation. If a developer can guess the endpoint, you've designed well.
REST API naming: nouns or verbs?
Nouns. Use /users (not /getUsers), /orders (not /createOrder). HTTP methods provide the verbs: GET /users (list), POST /users (create), GET /users/123 (read), PUT /users/123 (update).
Related Terms
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