--- title: "RESTful API Best Practices: Architecture, Methods, and Examples - API7.ai" description: "Learn RESTful API best practices for resource design, HTTP methods, status codes, versioning, pagination, security, OpenAPI docs, and gateway management." url: "https://api7.ai/learning-center/api-101/restful-api-best-practices" --- [Skip to article](#column-content) Column contentsAPI 101 [API 101](https://api7.ai/learning-center/api-101) Search this column 01 API Fundamentals [View this topic · 10](https://api7.ai/learning-center/api-101?topic=fundamentals)[1. Introduction to APIs: Definition and Importance](https://api7.ai/learning-center/api-101/what-is-api)[2. RESTful API Best Practices: Architecture, Methods, and Examples](https://api7.ai/learning-center/api-101/restful-api-best-practices)[3. SOAP vs REST: Differences, Examples, and When to Use Each](https://api7.ai/learning-center/api-101/soap-vs-rest-differences)[4. GraphQL: A New Approach to APIs](https://api7.ai/learning-center/api-101/what-is-graphql)[5. gRPC: High-Performance RPC Framework](https://api7.ai/learning-center/api-101/what-is-grpc)[6. Webhooks: Real-Time Communication Between Applications](https://api7.ai/learning-center/api-101/what-is-webhooks)[7. API Endpoints: Designing and Managing for Scalability and Security](https://api7.ai/learning-center/api-101/what-are-api-endpoints)[8. HTTP Methods: GET, POST, PUT, PATCH, DELETE & More](https://api7.ai/learning-center/api-101/http-methods-in-apis)[9. API Rate Limiting Best Practices and Algorithms](https://api7.ai/learning-center/api-101/api-rate-limiting)[10. API Versioning Strategies and Best Practices](https://api7.ai/learning-center/api-101/api-versioning) 02 API Development and Design [View this topic · 10](https://api7.ai/learning-center/api-101?topic=design)[11. How to Build an API: From Design to Deployment](https://api7.ai/learning-center/api-101/build-your-first-api)[12. API Documentation: Tools and Techniques](https://api7.ai/learning-center/api-101/api-documentation-tools-and-techniques)[13. OpenAPI Specification Guide: OAS, Examples, and Best Practices](https://api7.ai/learning-center/api-101/openapi-specification)[14. API Mocking: Testing Without a Backend](https://api7.ai/learning-center/api-101/api-mocking)[15. API Error Handling: Status Codes, Error Responses, and Best Practices](https://api7.ai/learning-center/api-101/error-handling-apis)[16. Authentication and Authorization in APIs](https://api7.ai/learning-center/api-101/authentication-authorization-apis)[17. OAuth 2.0: Secure API Access](https://api7.ai/learning-center/api-101/oauth-2.0-secure-api-access)[18. API Gateways: Managing and Securing Traffic](https://api7.ai/learning-center/api-101/api-gateways-managing-securing-traffic)[19. Microservices and APIs: Designing Modular Applications](https://api7.ai/learning-center/api-101/microservices-apis-modular-application-design)[20. API Orchestration: Combining Multiple Services](https://api7.ai/learning-center/api-101/api-orchestration-combining-services) 03 API Security [View this topic · 10](https://api7.ai/learning-center/api-101?topic=security)[21. How to Avoid Common Vulnerabilities](https://api7.ai/learning-center/api-101/how-to-avoid-common-api-vulnerabilities)[22. Implementing JWT for API Security](https://api7.ai/learning-center/api-101/implementing-jwt-for-api-security)[23. Rate Limiting and Throttling: Protecting Your API](https://api7.ai/learning-center/api-101/rate-limiting-and-throttling)[24. API Security Testing Tools and Techniques for Modern APIs](https://api7.ai/learning-center/api-101/api-security-testing-tools-and-techiniques)[25. CORS in APIs: Handling Cross-Origin Requests](https://api7.ai/learning-center/api-101/understanding-cors-in-apis)[26. Data Encryption in API Communication](https://api7.ai/learning-center/api-101/data-encryption-in-api-communication)[27. API Security Best Practices: Protecting Your Digital Front Door](https://api7.ai/learning-center/api-101/api-security-best-practices)[28. API Tokens Explained: Usage, Security, and Best Practices](https://api7.ai/learning-center/api-101/api-tokens-and-their-usage)[29. Securing APIs in Serverless Architectures](https://api7.ai/learning-center/api-101/secure-apis-in-serverless-architectures)[30. API Security in the Age of IoT](https://api7.ai/learning-center/api-101/api-security-in-the-age-of-iot) 04 API Integration [View this topic · 10](https://api7.ai/learning-center/api-101?topic=integration)[31. Integrating Third-Party APIs into Your Application](https://api7.ai/learning-center/api-101/integrate-third-party-apis)[32. API Aggregation: Combining Multiple APIs](https://api7.ai/learning-center/api-101/api-aggregation-combining-multiple-apis)[33. Real-Time Data with Streaming API](https://api7.ai/learning-center/api-101/real-time-data-with-streaming-apis)[34. Handling API Pagination: Fetching Large Data Sets](https://api7.ai/learning-center/api-101/handling-api-pagination)[35. Error Handling When Consuming APIs](https://api7.ai/learning-center/api-101/error-handling-when-consuming-apis)[36. API Integration Testing: Ensuring Reliability](https://api7.ai/learning-center/api-101/api-integration-testing-ensuring-reliability)[37. Working with Rate Limits in Third-Party APIs](https://api7.ai/learning-center/api-101/working-with-rate-limits-in-third-party-apis)[38. Automating Workflows with APIs](https://api7.ai/learning-center/api-101/automating-workflows-with-apis)[39. API Integration in Mobile Applications](https://api7.ai/learning-center/api-101/api-integration-in-mobile-applications)[40. How to Overcome API Integration Challenges](https://api7.ai/learning-center/api-101/how-to-overcome-api-integration-challenges) 05 API Management [View this topic · 10](https://api7.ai/learning-center/api-101?topic=management)[41. API Lifecycle Management: From Development to Retirement](https://api7.ai/learning-center/api-101/api-lifecycle-management)[42. Monitoring API Performance: Tools and Metrics](https://api7.ai/learning-center/api-101/api-performance-monitoring)[43. API Analytics: Understanding Usage Patterns](https://api7.ai/learning-center/api-101/api-analytics-guide)[44. Monetizing Your API: Strategies and Models](https://api7.ai/learning-center/api-101/api-monetization-strategies-models)[45. Scaling APIs: Best Practices for High Traffic](https://api7.ai/learning-center/api-101/scaling-api-high-traffic-best-practices)[46. API Governance Policies and Standards Guide](https://api7.ai/learning-center/api-101/api-governance-policies-standards-guide)[47. API Developer Portal Guide: Features, Onboarding, and Engagement](https://api7.ai/learning-center/api-101/developer-portal-guide-engaging-api-users)[48. Rate Limiting Strategies for API Management](https://api7.ai/learning-center/api-101/rate-limiting-strategies-for-api-management)[49. API Breaking Changes: Deprecation and Migration Guide](https://api7.ai/learning-center/api-101/api-versioning-managing-changes-over-time)[50. Choosing the Right API Management Platform](https://api7.ai/learning-center/api-101/choosing-the-right-api-management-platform) 06 Emerging API Practices [View this topic · 10](https://api7.ai/learning-center/api-101?topic=trends)[51. Serverless APIs: Building Scalable Applications](https://api7.ai/learning-center/api-101/serverless-apis)[52. API-First Development: From Contract to Production](https://api7.ai/learning-center/api-101/api-first-development)[53. Hypermedia APIs: HATEOAS and Its Applications](https://api7.ai/learning-center/api-101/hypermedia-apis)[54. The Role of AI in API Development](https://api7.ai/learning-center/api-101/ai-in-api-development)[55. APIs in IoT: Connecting Devices](https://api7.ai/learning-center/api-101/apis-in-iot)[56. REST and GraphQL APIs: Architecture, Caching, and Gateways](https://api7.ai/learning-center/api-101/graphql-vs-rest)[57. The Rise of API Marketplaces](https://api7.ai/learning-center/api-101/rise-of-api-marketplaces)[58. Event-Driven APIs: Designing for Real-Time](https://api7.ai/learning-center/api-101/event-driven-api-design-real-time)[59. Low-Code/No-Code API Development](https://api7.ai/learning-center/api-101/low-code-no-code-api-development-guide)[60. API Development Trends: The Future of APIs for Modern Teams](https://api7.ai/learning-center/api-101/future-and-trends-of-apis) 07 Industry API Applications [View this topic · 10](https://api7.ai/learning-center/api-101?topic=industries)[61. Payment Gateway APIs: Integrating Stripe and PayPal](https://api7.ai/learning-center/api-101/stripe-vs-paypal-api-integration-guide)[62. Social Media APIs: Facebook, Twitter, and Instagram](https://api7.ai/learning-center/api-101/social-media-apis)[63. Maps & Geolocation APIs: Google Maps, Mapbox, and OSM](https://api7.ai/learning-center/api-101/mapping-and-geolocation-apis)[64. E-commerce APIs: Building Modern Online Stores](https://api7.ai/learning-center/api-101/e-commerce-apis)[65. Healthcare APIs: Connecting Medical Data](https://api7.ai/learning-center/api-101/healthcare-apis)[66. Financial APIs: Accessing Banking Services](https://api7.ai/learning-center/api-101/financial-apis)[67. Travel and Booking APIs: Integrating Flight and Hotel Data](https://api7.ai/learning-center/api-101/travel-and-booking-apis)[68. Music and Video Streaming APIs: Spotify and YouTube](https://api7.ai/learning-center/api-101/music-and-video-streaming-apis)[69. Weather APIs: Accessing Meteorological Data](https://api7.ai/learning-center/api-101/weather-apis)[70. Sports Data APIs: Features, Use Cases, and Integration Tips](https://api7.ai/learning-center/api-101/sports-data-apis) 08 Tools and Platforms [View this topic · 10](https://api7.ai/learning-center/api-101?topic=tools)[71. What Is Postman? API Development Platform Guide](https://api7.ai/learning-center/api-101/postman-api-development-environment)[72. Swagger: Designing and Documenting APIs](https://api7.ai/learning-center/api-101/swagger-designing-and-documenting-apis)[73. Insomnia API Client: Debug, Test, and Design APIs](https://api7.ai/learning-center/api-101/insomnia-rest-client-for-debugging)[74. What Is Apigee? API Management Features and Architecture](https://api7.ai/learning-center/api-101/apigee-api-management-platform)[75. Building Serverless APIs with AWS API Gateway](https://api7.ai/learning-center/api-101/aws-api-gateway-building-serverless-apis)[76. Apache APISIX: Open-Source API Gateway and Enterprise Support](https://api7.ai/learning-center/api-101/apache-apisix-open-source-api-gateway)[77. MuleSoft: Connecting Applications and Data](https://api7.ai/learning-center/api-101/mulesoft-connecting-applications-and-data)[78. RapidAPI Guide: Discovering, Testing, and Connecting to APIs](https://api7.ai/learning-center/api-101/rapidapi-discovering-and-connecting-to-apis)[79. Firebase: Backend as a Service](https://api7.ai/learning-center/api-101/firebase-backend-as-a-service)[80. Auth0: Complete Authentication and Authorization Platform](https://api7.ai/learning-center/api-101/auth0-authentication-authorization-platform) 09 API Testing [View this topic · 10](https://api7.ai/learning-center/api-101?topic=testing)[81. Automated API Testing: Tools and Techniques](https://api7.ai/learning-center/api-101/automated-api-testing-tools-and-techniques)[82. Load Testing Your API: Ensuring Performance at Scale](https://api7.ai/learning-center/api-101/load-testing-your-api-ensuring-performance)[83. Mocking APIs for Testing: Accelerating Development and Improving Quality](https://api7.ai/learning-center/api-101/mocking-apis-for-testing-purposes)[84. Contract Testing in API Development: Ensuring Reliable Integration](https://api7.ai/learning-center/api-101/contract-testing-in-api-development)[85. Postman API Testing Automation: Newman, CLI, and CI/CD](https://api7.ai/learning-center/api-101/using-postman-for-api-testing)[86. Continuous Integration and API Testing](https://api7.ai/learning-center/api-101/continuous-integration-and-api-testing)[87. Security Testing for APIs: Protecting Your API from Vulnerabilities](https://api7.ai/learning-center/api-101/security-testing-for-apis)[88. Handling API Deprecations in Testing: Strategies for Smooth Transitions](https://api7.ai/learning-center/api-101/handling-api-deprecations-in-testing)[89. Testing GraphQL APIs: Challenges and Solutions](https://api7.ai/learning-center/api-101/testing-graphql-apis-challenges-and-solutions)[90. API Test Automation Frameworks: A Comparative Study](https://api7.ai/learning-center/api-101/api-test-automation-frameworks-comparative-study) 10 Documentation and Developer Experience [View this topic · 10](https://api7.ai/learning-center/api-101?topic=documentation)[91. Writing Clear and Concise API Documentation](https://api7.ai/learning-center/api-101/writing-clear-and-concise-api-documentation)[92. Tools for Generating API Documentation](https://api7.ai/learning-center/api-101/tools-for-generating-api-documentation)[93. Interactive API Documentation for Developer Experience](https://api7.ai/learning-center/api-101/interactive-api-documentation)[94. Maintaining Documentation for Multiple API Versions](https://api7.ai/learning-center/api-101/maintaining-documentation-for-multiple-api-versions)[95. Using OpenAPI for API Documentation](https://api7.ai/learning-center/api-101/using-openapi-for-api-documentation)[96. Best Practices for Documenting API Error Responses](https://api7.ai/learning-center/api-101/best-practices-for-documenting-api-error-responses)[97. Incorporating Code Samples in API Documentation](https://api7.ai/learning-center/api-101/incorporating-code-samples-in-api-documentation)[98. API Documentation for Non-Developers](https://api7.ai/learning-center/api-101/api-documentation-for-non-developers)[99. Translating API Documentation for Global Audiences](https://api7.ai/learning-center/api-101/translating-api-documentation-for-global-audiences)[100. How to Measure API Documentation Effectiveness](https://api7.ai/learning-center/api-101/measuring-api-documentation-effectiveness) [API 101](https://api7.ai/learning-center/api-101)[API Fundamentals](https://api7.ai/learning-center/api-101?topic=fundamentals) On this page On this page - [RESTful API Best Practices Checklist](#restful-api-best-practices-checklist) - [How Do RESTful APIs Work?](#how-do-restful-apis-work) - [REST API Request Example](#rest-api-request-example) - [REST API Response Example](#rest-api-response-example) - [The 6 REST Architectural Constraints](#the-6-rest-architectural-constraints) - [1. Client-Server Separation](#1-client-server-separation) - [2. Statelessness](#2-statelessness) - [3. Cacheability](#3-cacheability) - [4. Uniform Interface](#4-uniform-interface) - [5. Layered System](#5-layered-system) - [6. Code on Demand (Optional)](#6-code-on-demand-optional) - [HTTP Methods in RESTful APIs](#http-methods-in-restful-apis) - [CRUD Examples with curl](#crud-examples-with-curl) - [REST vs. RESTful: What's the Difference?](#rest-vs-restful-whats-the-difference) - [RESTful API Design Best Practices](#restful-api-design-best-practices) - [1. Use Nouns for Resource URLs](#1-use-nouns-for-resource-urls) - [2. Use Plural Resource Names](#2-use-plural-resource-names) - [3. Use Proper HTTP Status Codes](#3-use-proper-http-status-codes) - [4. Version Your API](#4-version-your-api) - [5. Support Filtering, Sorting, and Pagination](#5-support-filtering-sorting-and-pagination) - [6. Use JSON as the Default Format](#6-use-json-as-the-default-format) - [7. Handle Errors Consistently](#7-handle-errors-consistently) - [8. Secure Your API](#8-secure-your-api) - [9. Document with OpenAPI](#9-document-with-openapi) - [RESTful API vs. Other API Styles](#restful-api-vs-other-api-styles) - [Managing RESTful APIs in Production](#managing-restful-apis-in-production) - [Frequently Asked Questions](#frequently-asked-questions) - [What is the difference between REST and RESTful?](#what-is-the-difference-between-rest-and-restful) - [Is a RESTful API the same as an HTTP API?](#is-a-restful-api-the-same-as-an-http-api) - [When should I use a RESTful API vs. GraphQL?](#when-should-i-use-a-restful-api-vs-graphql) - [How do I secure a RESTful API?](#how-do-i-secure-a-restful-api) - [What are the most important REST API best practices?](#what-are-the-most-important-rest-api-best-practices) - [What is HATEOAS and do I need it?](#what-is-hateoas-and-do-i-need-it) - [Conclusion](#conclusion) Article 2 # RESTful API Best Practices: Architecture, Methods, and Examples API7.ai February 8, 2025 **A RESTful API** (Representational State Transfer API) is a web service interface that follows REST architectural constraints, including stateless communication, resource-based URLs, and standard [HTTP methods](https://api7.ai/learning-center/api-101/http-methods-in-apis). RESTful API best practices help teams design APIs that are predictable for developers, easier to secure, and simpler to manage in production. This guide explains how RESTful APIs work, then turns the principles into practical design guidance: resource naming, GET/POST/PUT/PATCH usage, status codes, versioning, pagination, error handling, OpenAPI documentation, and production management with an [API gateway](https://api7.ai/learning-center/api-gateway-guide/what-is-an-api-gateway). | Attribute | Details | | ------------------- | --------------------------------------------------------------------------- | | Full name | Representational State Transfer Application Programming Interface | | Architectural style | REST (Roy Fielding, 2000) | | Transport protocol | HTTP / HTTPS | | Data formats | JSON (most common), XML, YAML, plain text | | HTTP methods | GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS | | Stateful? | No — each request is independent | | Best for | Web apps, mobile backends, microservices, public APIs, cloud-native systems | ## RESTful API Best Practices Checklist Use this checklist when reviewing a new or existing REST API: | Area | Best Practice | | --------------- | -------------------------------------------------------------------------------------------- | | Resource design | Use nouns, plural collections, and stable URL patterns | | HTTP methods | Use GET for reads, POST for creation/actions, PUT for replacement, PATCH for partial updates | | Status codes | Return meaningful 2xx, 4xx, and 5xx responses | | Versioning | Choose a versioning strategy before breaking changes are introduced | | Pagination | Support filtering, sorting, and pagination for collections | | Security | Enforce HTTPS, authentication, authorization, and rate limiting | | Documentation | Publish OpenAPI specs and keep examples current | | Operations | Monitor latency, error rates, traffic volume, and upstream health | ## How Do RESTful APIs Work? A RESTful API works by exposing **resources** (data entities like users, products, or orders) at specific URLs, and allowing clients to perform operations on those resources using standard **HTTP methods**. A client request to a web API normally includes a method, resource URL, request headers, and sometimes a body. 1. **The client sends an HTTP request** — specifying the URL (resource), HTTP method (operation), headers (metadata), and optionally a request body (data) 2. **The server processes the request** — validates authentication, applies business logic, and interacts with the database 3. **The server returns an HTTP response** — containing a status code (success/failure), headers, and a response body (usually JSON) ### REST API Request Example ``` GET /api/v1/users/42 HTTP/1.1 Host: api.example.com Authorization: Bearer eyJhbGciOiJIUzI1NiIs... Accept: application/json ``` ### REST API Response Example ``` HTTP/1.1 200 OK Content-Type: application/json ``` **Uniform Interface**: The interface between clients and servers is uniform, making it easier to understand and interact with different resources. This uniformity is achieved through standard [HTTP methods](https://api7.ai/learning-center/api-101/http-methods-in-apis) (GET, POST, PUT, DELETE) and media types (JSON, XML). A uniform interface ensures that clients can interact with different resources in a consistent manner, reducing the learning curve and improving developer productivity. ## The 6 REST Architectural Constraints Roy Fielding defined REST in his [2000 doctoral dissertation](https://ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm) as an architectural style with six constraints. A truly RESTful API follows all six: ### 1. Client-Server Separation The client (frontend, mobile app) and server (API backend) are independent systems connected only through the API interface. The client doesn't need to know how the server stores data, and the server doesn't need to know how the client displays it. **Why it matters**: Each side can evolve independently. You can rebuild your mobile app without touching the API, or migrate your database without changing client code. ### 2. Statelessness Every request from client to server must contain **all the information** needed to process it. The server does not store client session state between requests. **Why it matters**: Stateless servers are easy to scale horizontally — any server instance can handle any request. This is why RESTful APIs are the dominant choice for cloud-native and microservices architectures. ``` # Each request carries its own authentication — no server-side session GET /api/v1/orders HTTP/1.1 Authorization: Bearer eyJhbGciOiJIUzI1NiIs... ``` ### 3. Cacheability Responses must declare whether they are cacheable or not. When responses are cacheable, clients and intermediaries (CDNs, proxies) can reuse them, reducing server load and improving performance. ``` HTTP/1.1 200 OK Cache-Control: public, max-age=3600 ETag: "abc123" ``` ### 4. Uniform Interface All resources are accessed through a consistent, standardized interface. This is the most distinctive feature of REST and includes four sub-constraints: - **Resource identification** — each resource has a unique URL (e.g., `/users/42`) - **Resource manipulation through representations** — clients interact with JSON/XML representations of resources, not the resources themselves - **Self-descriptive messages** — each request/response contains enough metadata (Content-Type, status codes) to be understood without external context - **HATEOAS** (Hypermedia as the Engine of Application State) — responses include links to related resources ### 5. Layered System The architecture can include multiple layers (load balancers, [API gateways](https://api7.ai/learning-center/api-gateway-guide/what-is-an-api-gateway), caches, authentication services) between client and server. Each layer only interacts with its adjacent layers. **Why it matters**: You can insert an API gateway between clients and your backend to add rate limiting, authentication, and monitoring without changing either the client or the server. ### 6. Code on Demand (Optional) Servers can optionally send executable code (like JavaScript) to the client. This is the only optional REST constraint and is rarely used in modern APIs. ## HTTP Methods in RESTful APIs RESTful APIs use standard [HTTP methods](https://api7.ai/learning-center/api-101/http-methods-in-apis) to perform CRUD (Create, Read, Update, Delete) operations on resources: | Method | CRUD Operation | Typical Use | Idempotent | | -------- | -------------- | ----------------------------------------------------------- | -------------- | | `GET` | Read | Retrieve a resource or collection | Yes | | `POST` | Create | Create a new resource or trigger a non-idempotent action | No | | `PUT` | Update/Replace | Replace an existing resource with a complete representation | Yes | | `PATCH` | Update/Modify | Apply partial updates to a resource | Not guaranteed | | `DELETE` | Delete | Remove a resource | Yes | Note: PATCH is not guaranteed to be idempotent, but it can be implemented in an idempotent way. ### CRUD Examples with curl **Create a user (POST)**: ``` curl -X POST https://api.example.com/v1/users \ -H "Content-Type: application/json" \ -H "Authorization: Bearer YOUR_TOKEN" \ -d '{ "name": "Jane Smith", "email": "jane@example.com", "role": "developer" }' ``` **Read a user (GET)**: ``` curl -X GET https://api.example.com/v1/users/42 \ -H "Authorization: Bearer YOUR_TOKEN" ``` **Update a user (PUT)**: ``` curl -X PUT https://api.example.com/v1/users/42 \ -H "Content-Type: application/json" \ -H "Authorization: Bearer YOUR_TOKEN" \ -d '{ "name": "Jane Smith", "email": "jane.smith@example.com", "role": "admin" }' ``` **Delete a user (DELETE)**: ``` curl -X DELETE https://api.example.com/v1/users/42 \ -H "Authorization: Bearer YOUR_TOKEN" ``` ## REST vs. RESTful: What's the Difference? A common question is the difference between "REST" and "RESTful": | Term | Meaning | | ------------ | -------------------------------------------------------------------------------------------------- | | **REST** | The architectural style (the theory) — a set of constraints defined by Roy Fielding | | **RESTful** | An API that implements the REST constraints (the practice) — describes a conforming implementation | | **REST API** | Commonly used interchangeably with "RESTful API" in practice | In practice, most APIs described as "REST APIs" are **partially RESTful** — they follow some REST constraints (statelessness, resource URLs, HTTP methods) but not all (especially HATEOAS). The terms "REST API" and "RESTful API" are used interchangeably in most contexts. ## RESTful API Design Best Practices ### 1. Use Nouns for Resource URLs Resource URLs should use **nouns** (things) not verbs (actions). The HTTP method already specifies the action. ``` # Good — nouns GET /users POST /users GET /users/42/orders # Bad — verbs in URL GET /getUsers POST /createUser GET /getUserOrders?userId=42 ``` ### 2. Use Plural Resource Names Use plural names for consistency, even for singleton resources: ``` GET /users # list users GET /users/42 # get one user GET /products # list products ``` ### 3. Use Proper HTTP Status Codes Return meaningful status codes that match the operation result: | Status Code | Meaning | When to Use | | --------------------------- | ------------------ | ---------------------------------------------- | | `200 OK` | Success | GET, PUT, PATCH requests that succeed | | `201 Created` | Resource created | POST requests that create a new resource | | `204 No Content` | Success, no body | DELETE requests that succeed | | `400 Bad Request` | Client error | Invalid request body, missing required fields | | `401 Unauthorized` | Not authenticated | Missing or invalid authentication credentials | | `403 Forbidden` | Not authorized | Valid credentials but insufficient permissions | | `404 Not Found` | Resource not found | Resource doesn't exist at the given URL | | `429 Too Many Requests` | Rate limited | Client exceeded rate limit | | `500 Internal Server Error` | Server error | Unexpected server-side failure | ### 4. Version Your API Include the API version in the URL path to manage breaking changes: ``` https://api.example.com/v1/users https://api.example.com/v2/users ``` Alternatively, use header-based versioning: ``` GET /users HTTP/1.1 Accept: application/vnd.example.v2+json ``` ### 5. Support Filtering, Sorting, and Pagination For collection endpoints, support query parameters for filtering, sorting, and pagination: ``` GET /users?role=admin&sort=created_at&order=desc&page=2&limit=25 ``` ### 6. Use JSON as the Default Format JSON is the standard data format for RESTful APIs. Always set `Content-Type: application/json` and accept JSON request bodies: ``` { "data": [ { "id": 1, "name": "Alice" }, { "id": 2, "name": "Bob" } ], "meta": { "total": 150, "page": 1, "limit": 25 } } ``` ### 7. Handle Errors Consistently Return structured error responses with a consistent format: ``` { "error": { "code": "VALIDATION_ERROR", "message": "Email field is required", "details": [ { "field": "email", "issue": "missing_required_field" } ] } } ``` ### 8. Secure Your API - **Use HTTPS** for all API traffic — never send data over unencrypted HTTP - **Authenticate** with [OAuth 2.0](https://oauth.net/2/), [JWT](https://api7.ai/learning-center/api-101/implementing-jwt-for-api-security), or [API keys](https://api7.ai/blog/what-is-api-key-why-need-them-complete-guide) - **Authorize** at the resource level — check permissions on every request - **Rate limit** to prevent abuse — use an [API gateway](https://api7.ai/learning-center/api-gateway-guide/what-is-an-api-gateway) to enforce limits per consumer - **Validate all inputs** — never trust client data ### 9. Document with OpenAPI Use the [OpenAPI Specification](https://api7.ai/learning-center/api-101/openapi-specification) to document your API in a machine-readable format. Tools like Swagger UI generate interactive documentation automatically: ``` openapi: 3.0.0 info: title: User API version: 1.0.0 paths: /users: get: summary: List all users parameters: - name: role in: query schema: type: string responses: '200': description: A list of users content: application/json: schema: type: array items: $ref: '#/components/schemas/User' ``` ## RESTful API vs. Other API Styles | Feature | REST | GraphQL | gRPC | SOAP | | ------------------ | ---------------------------- | ------------------------- | ------------------------ | ------------------------- | | **Data format** | JSON/XML | JSON | Protocol Buffers | XML | | **Transport** | HTTP | HTTP | HTTP/2 | HTTP, SMTP, TCP | | **Schema** | OpenAPI (optional) | Required (SDL) | Required (.proto) | Required (WSDL) | | **Fetching** | Fixed endpoints | Client-defined queries | RPC methods | Operations | | **Caching** | HTTP-native | Complex | Difficult | Difficult | | **Learning curve** | Low | Medium | High | High | | **Best for** | Web/mobile apps, public APIs | Complex frontends, mobile | Microservices, streaming | Enterprise legacy systems | - Choose **REST** when you need simplicity, HTTP caching, and broad tooling support - Choose **[GraphQL](https://api7.ai/learning-center/api-101/what-is-graphql)** when clients need flexible queries and you want to avoid over-fetching - Choose **[gRPC](https://api7.ai/learning-center/api-101/what-is-grpc)** when you need high-performance, low-latency microservice communication - Choose **SOAP** when working with enterprise systems that require strict contracts and WS-Security For a closer look at query flexibility, caching, versioning, and operational trade-offs, read this [GraphQL vs. REST API comparison](https://api7.ai/blog/graphql-vs-rest-api-comparison-2025). ## Managing RESTful APIs in Production As your RESTful API grows, you need infrastructure to manage authentication, rate limiting, monitoring, and security at scale. This is where an [API gateway](https://api7.ai/learning-center/api-gateway-guide/what-is-an-api-gateway) comes in. An API gateway like [Apache APISIX](https://apisix.apache.org/) sits in front of your REST API services and provides: - **Authentication** — validate JWT tokens, API keys, or OAuth2 credentials on every request - **Rate limiting** — protect your backend from abuse with per-consumer, per-route limits - **Load balancing** — distribute traffic across multiple API server instances - **Observability** — collect metrics (latency, error rates, throughput) and export to Prometheus/Grafana - **Request transformation** — modify headers, rewrite URLs, and transform request/response bodies - **Security** — WAF protection, IP allowlisting, and CORS enforcement For teams managing production RESTful APIs, [API7 Enterprise](https://api7.ai/enterprise) provides a managed API gateway solution with a management console, developer portal, and enterprise support. ## Frequently Asked Questions ### What is the difference between REST and RESTful? **REST** is an architectural style — a set of design constraints for building web services. **RESTful** describes an API that follows those constraints. In everyday usage, "REST API" and "RESTful API" mean the same thing: an API that uses HTTP methods, resource-based URLs, and stateless communication. ### Is a RESTful API the same as an HTTP API? Not exactly. All RESTful APIs use HTTP, but not all HTTP APIs are RESTful. An HTTP API that uses verbs in URLs (e.g., `/getUser?id=42`), stores server-side sessions, or ignores standard status codes is an HTTP API but not a RESTful one. RESTful APIs follow specific architectural constraints beyond just using HTTP. ### When should I use a RESTful API vs. GraphQL? Use a RESTful API when you need simple CRUD operations, HTTP caching, and broad client compatibility. Use GraphQL when clients need to fetch exactly the data they need from complex, interconnected data models — especially for mobile apps where bandwidth is limited. Many organizations use both: REST for simple services and GraphQL as an aggregation layer. ### How do I secure a RESTful API? The foundation is HTTPS for all traffic. For authentication, use JWT tokens or OAuth 2.0 for user-facing APIs, and API keys for server-to-server communication. For production deployments, put an API gateway in front of your services to enforce rate limiting, validate tokens, and block malicious requests at the edge. ### What are the most important REST API best practices? The most important REST API best practices are to use resource-oriented URLs, choose the correct HTTP methods, return consistent status codes, paginate collection responses, document APIs with OpenAPI, and enforce authentication, authorization, and rate limiting in production. ### What is HATEOAS and do I need it? HATEOAS (Hypermedia as the Engine of Application State) is the REST constraint that says API responses should include links to related resources and available actions. For example, a response for a user might include a link to their orders. While it's part of the REST specification, most real-world APIs skip HATEOAS in favor of explicit API documentation. It's nice to have but not required for most use cases. ## Conclusion RESTful APIs are the backbone of modern web development, providing a simple, scalable, and well-understood approach to building web services. By following REST's architectural constraints — statelessness, resource-based URLs, standard HTTP methods, and proper status codes — you can build APIs that are easy to understand, easy to cache, and easy to scale. Continue learning about API fundamentals and best practices: - [HTTP Methods in APIs](https://api7.ai/learning-center/api-101/http-methods-in-apis) — Deep dive into GET, POST, PUT, DELETE and when to use each - [OpenAPI Specification](https://api7.ai/learning-center/api-101/openapi-specification) — The standard for documenting and defining REST APIs - [What Is an API Gateway?](https://api7.ai/learning-center/api-gateway-guide/what-is-an-api-gateway) — How API gateways manage traffic, security, and routing for REST APIs - [What Is an API Key?](https://api7.ai/blog/what-is-api-key-why-need-them-complete-guide) — Understanding API key authentication for securing your APIs - [API Testing with Postman](https://api7.ai/learning-center/api-101/using-postman-for-api-testing) — How to test and debug RESTful APIs using Postman Follow [our LinkedIn](https://sg.linkedin.com/company/api7-ai) for valuable insights delivered straight to your inbox! [Previous article**Introduction to APIs: Definition and Importance**](https://api7.ai/learning-center/api-101/what-is-api)[Next article**SOAP vs REST: Differences, Examples, and When to Use Each**](https://api7.ai/learning-center/api-101/soap-vs-rest-differences) On this page - [RESTful API Best Practices Checklist](#restful-api-best-practices-checklist) - [How Do RESTful APIs Work?](#how-do-restful-apis-work) - [REST API Request Example](#rest-api-request-example) - [REST API Response Example](#rest-api-response-example) - [The 6 REST Architectural Constraints](#the-6-rest-architectural-constraints) - [1. Client-Server Separation](#1-client-server-separation) - [2. Statelessness](#2-statelessness) - [3. Cacheability](#3-cacheability) - [4. Uniform Interface](#4-uniform-interface) - [5. Layered System](#5-layered-system) - [6. Code on Demand (Optional)](#6-code-on-demand-optional) - [HTTP Methods in RESTful APIs](#http-methods-in-restful-apis) - [CRUD Examples with curl](#crud-examples-with-curl) - [REST vs. RESTful: What's the Difference?](#rest-vs-restful-whats-the-difference) - [RESTful API Design Best Practices](#restful-api-design-best-practices) - [1. Use Nouns for Resource URLs](#1-use-nouns-for-resource-urls) - [2. Use Plural Resource Names](#2-use-plural-resource-names) - [3. Use Proper HTTP Status Codes](#3-use-proper-http-status-codes) - [4. Version Your API](#4-version-your-api) - [5. Support Filtering, Sorting, and Pagination](#5-support-filtering-sorting-and-pagination) - [6. Use JSON as the Default Format](#6-use-json-as-the-default-format) - [7. Handle Errors Consistently](#7-handle-errors-consistently) - [8. Secure Your API](#8-secure-your-api) - [9. Document with OpenAPI](#9-document-with-openapi) - [RESTful API vs. Other API Styles](#restful-api-vs-other-api-styles) - [Managing RESTful APIs in Production](#managing-restful-apis-in-production) - [Frequently Asked Questions](#frequently-asked-questions) - [What is the difference between REST and RESTful?](#what-is-the-difference-between-rest-and-restful) - [Is a RESTful API the same as an HTTP API?](#is-a-restful-api-the-same-as-an-http-api) - [When should I use a RESTful API vs. GraphQL?](#when-should-i-use-a-restful-api-vs-graphql) - [How do I secure a RESTful API?](#how-do-i-secure-a-restful-api) - [What are the most important REST API best practices?](#what-are-the-most-important-rest-api-best-practices) - [What is HATEOAS and do I need it?](#what-is-hateoas-and-do-i-need-it) - [Conclusion](#conclusion)