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API Design Best Practices Cheat Sheet

A ten-point reference checklist for designing clean and reliable REST APIs.

From the Xiry library · Updated 11 October 2026

This reference checklist outlines ten foundational best practices for building RESTful APIs, created by Pratham Kumar. It covers key architecture decisions including URL naming conventions, HTTP method usage, versioning, status codes, error structures, security, rate limiting, and caching.

The framework

  1. Use RESTful URLs — make endpoints clear, meaningful, follow REST conventions. Example: /users/{id} instead of /getUserById.
  2. Implement Proper HTTP Methods — correct verbs for the action. GET for reading, POST for creating, PUT/PATCH for updating, DELETE for removing.
  3. Version Your API — include a version for backward compatibility. /v1/products, or headers like Accept: application/vnd.api+json;v=1.
  4. Provide Pagination for Large Responses — use ?page=1&limit=10 to return paginated responses.
  5. Use Consistent Error Handling — structured, informative error messages with proper status codes; return JSON with details, e.g. 404 for not found, 400 for validation issues.
  6. Secure Your API with Authentication and Authorization — implement OAuth, JWT, or API keys; require Authorization headers with tokens.
  7. Return the Right Status Codes — 200 OK, 201 Created, 400 Bad Request, 401 Unauthorized, 404 Not Found, 500 Internal Server Error.
  8. Document Your API — detailed docs with endpoint descriptions, parameters, sample responses; use Swagger or Postman for interactive docs.
  9. Rate Limit Your API — indicate limits via headers: X-RateLimit-Limit, X-RateLimit-Remaining; return 429 Too Many Requests when exceeded.
  10. Use Caching to Optimize Performance — use Cache-Control headers to specify how long clients can cache responses.

What it's for

  • Review an API schema or design spec before starting implementation
  • Audit existing endpoints for consistency in URL naming, error formats, and status codes
  • Onboard junior backend developers to standard REST conventions

Key points

  • RESTful URL conventions using resource nouns instead of actions
  • Standard HTTP verb mapping (GET, POST, PUT/PATCH, DELETE)
  • API versioning strategies via path prefixes or Accept headers
  • Query-based pagination patterns for large collections
  • Standardized JSON error response structures and status code matching
  • Auth implementation guidance using tokens and authorization headers
  • Operational safeguards including rate limiting headers and Cache-Control

Pricing

Free

Details

Type
Framework
Category
Development
Topic
API Design
Open source
No
Platforms
other
For
Backend engineers and API designers
Tags
api, rest, backend, architecture, cheatsheet, bestpractices

Why it was saved

  • @Prathkum, 17 September 2024: A complete reference checklist for designing and shipping a well-behaved API: URLs, verbs, versioning, pagination, errors, auth, status codes, docs, rate limiting, caching.

Related

Updated