API Design Principles

API Design Principles

Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers and stand the test of time.

When to Use This Skill

• Designing new REST or GraphQL APIs
• Refactoring existing APIs for better usability
• Establishing API design standards for your team
• Reviewing API specifications before implementation
• Migrating between API paradigms (REST to GraphQL, etc.)
• Creating developer-friendly API documentation
• Optimizing APIs for specific use cases (mobile, third-party integrations)

Core Concepts

1. RESTful Design Principles

Resource-Oriented Architecture

• Resources are nouns (users, orders, products), not verbs
• Use HTTP methods for actions (GET, POST, PUT, PATCH, DELETE)
• URLs represent resource hierarchies
• Consistent naming conventions

HTTP Methods Semantics:

• GET: Retrieve resources (idempotent, safe)
• POST: Create new resources
• PUT: Replace entire resource (idempotent)
• PATCH: Partial resource updates
• DELETE: Remove resources (idempotent)

2. GraphQL Design Principles

Schema-First Development

• Types define your domain model
• Queries for reading data
• Mutations for modifying data
• Subscriptions for real-time updates

Query Structure:

• Clients request exactly what they need
• Single endpoint, multiple operations
• Strongly typed schema
• Introspection built-in

3. API Versioning Strategies

URL Versioning:

/api/v1/users
/api/v2/users

Header Versioning:

Accept: application/vnd.api+json; version=1

Query Parameter Versioning:

/api/users?version=1

REST API Design Overview

REST APIs follow resource-oriented patterns with standard HTTP methods. See REST Best Practices for detailed implementation patterns.

Key patterns include:

• Resource Collection Design: Plural nouns, nested resources
• Pagination and Filtering: Cursor or offset-based pagination
• Error Handling: Consistent error responses with proper status codes
• HATEOAS: Hypermedia links for discoverability

GraphQL Design Overview

GraphQL uses schema-first development with single endpoint architecture. See API Examples for complete code samples.

Key patterns include:

• Schema Design: Types, queries, mutations, subscriptions
• Resolver Design: Field resolvers with DataLoader batching
• N+1 Prevention: DataLoader pattern for efficient fetching
• Pagination: Relay-style cursor-based pagination

Best Practices

REST APIs

1. Consistent Naming: Use plural nouns for collections (/users, not /user)
2. Stateless: Each request contains all necessary information
3. Use HTTP Status Codes Correctly: 2xx success, 4xx client errors, 5xx server errors
4. Version Your API: Plan for breaking changes from day one
5. Pagination: Always paginate large collections
6. Rate Limiting: Protect your API with rate limits
7. Documentation: Use OpenAPI/Swagger for interactive docs

GraphQL APIs

1. Schema First: Design schema before writing resolvers
2. Avoid N+1: Use DataLoaders for efficient data fetching
3. Input Validation: Validate at schema and resolver levels
4. Error Handling: Return structured errors in mutation payloads
5. Pagination: Use cursor-based pagination (Relay spec)
6. Deprecation: Use @deprecated directive for gradual migration
7. Monitoring: Track query complexity and execution time

Common Pitfalls

• Over-fetching/Under-fetching (REST): Fixed in GraphQL but requires DataLoaders
• Breaking Changes: Version APIs or use deprecation strategies
• Inconsistent Error Formats: Standardize error responses
• Missing Rate Limits: APIs without limits are vulnerable to abuse
• Poor Documentation: Undocumented APIs frustrate developers
• Ignoring HTTP Semantics: POST for idempotent operations breaks expectations
• Tight Coupling: API structure shouldn't mirror database schema

Resources

• references/guides/rest-best-practices.md: Comprehensive REST API patterns and examples
• references/examples/api-examples.md: GraphQL schema and resolver code samples
• references/graphql-schema-design.md: GraphQL schema patterns and anti-patterns
• references/api-versioning-strategies.md: Versioning approaches and migration paths
• assets/rest-api-template.py: FastAPI REST API template
• assets/graphql-schema-template.graphql: Complete GraphQL schema example
• assets/api-design-checklist.md: Pre-implementation review checklist
• scripts/openapi-generator.py: Generate OpenAPI specs from code

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