83% of web traffic is API calls. Your API is your product's interface to the world — other teams, partners, customers, and integrations depend on it. A well-designed API is intuitive, consistent, documented, and forgiving. A poorly designed API creates support burden, integration delays, and frustrated developers who choose competitors.
Consistent, predictable URLs.Every error follows this structure.| Best For | CRUD, public APIs, caching | Complex queries, mobile, flexible data |
| Learning Curve | Low | Moderate |
| Caching | HTTP caching built-in | Requires custom caching |
| Over-fetching | Common (fixed responses) | Eliminated (client specifies) |
| Tooling | Mature, universal | Growing, excellent type safety |
| Versioning | URL or header | Schema evolution |
The best APIs are designed from the consumer's perspective, not the database schema. Think about what developers need to accomplish, make common tasks easy, and document everything. Your API is a product — invest in its design the way you invest in your user interface.
API design best practices include using noun-based resource URLs with standard HTTP methods, consistent error responses with machine-readable codes, cursor-based pagination for large datasets, and semantic versioning. Well-designed APIs follow RESTful conventions, provide OpenAPI/Swagger documentation generated from code, and use OAuth 2.0 or JWT for authentication.
Key Takeaways
- Use nouns for resources, HTTP methods for actions — GET /users not GET /getUsers
- Consistent error responses with machine-readable codes and human-readable messages
- Cursor-based pagination for large datasets — offset breaks on concurrent writes
- Version in URL path (/v1/) for public APIs, header for internal
- OpenAPI/Swagger documentation generated from code, not maintained separately
Frequently Asked Questions
Key Terms
- REST
- Representational State Transfer — architectural style using HTTP methods on URL-identified resources.
- OpenAPI
- Specification for describing RESTful APIs, enabling documentation, code generation, and testing.
- Idempotency
- Property where making the same request multiple times produces the same result — critical for safe retries.
How does this apply to what you are building?
Every project has its own context. If any of this sparked questions about your stack, team or next decision, we are happy to think through it together.
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Great APIs are intuitive, consistent, well-documented, and forgiving. Key practices: noun-based URLs, standard HTTP methods, consistent error format, cursor-based pagination, semantic versioning, and OpenAPI documentation.