REST API: 10 Best Practices for a Reliable API
A reliable API is more than endpoints that respond. Its contract must remain understandable, secure and predictable when multiple applications and teams use it.
Contents
1. 1 to 3: Resources, methods and status codes
Use consistent resource names, HTTP methods that match their intended purpose and precise status codes. A uniform convention reduces integration errors.
- GET to read
- POST to create
- PUT or PATCH to update
- DELETE to remove
2. 4 and 5: Validation and error format
Validate every input server-side and return a stable error structure that includes a code, a clear message and the affected fields. Never leak internal details.
3. 6 and 7: Authentication and authorization
Authenticating a call isn’t enough: verify that this identity is allowed to perform the action on the requested resource. Apply least privilege and protect your secrets.
4. 8: Pagination, filters and limits
Collections should be paginated and parameters bounded. Add appropriate rate limiting so that a single faulty client can’t degrade the entire service.
5. 9 and 10: Observability and versioning
Log relevant events with a correlation ID, measure latency and errors, document the contract and announce breaking changes before anything is removed.
Pre-release review
- Schema and documentation up to date
- Authorization tested
- Errors free of sensitive data
- Pagination and limits defined
- Logging and alerting in place