An API is a product interface for another developer or system. Good API design reduces guesswork in common tasks and makes failures understandable when something goes wrong.
Model resources around the domain
Use names that match the concepts users and teams already discuss. A booking API should expose bookings and availability rather than internal table names. Keep conventions for URLs, methods and response shapes consistent across the service.
Make errors useful
Return a clear status, a stable error code and a message that helps the caller recover. Avoid exposing internal stack traces. Document validation rules and show which field needs attention when a request is incomplete.
- Use a consistent format for success and error responses.
- Explain pagination and filtering behavior.
- Include examples for common tasks and failure cases.
Design for change
Think about optional fields, compatibility and deprecation before clients depend on the first version. Avoid changing the meaning of a field without warning. When a breaking change is necessary, give integrators a migration path and enough time to test it.
Test from the client's side
Build a small integration using only the public documentation. If the team must ask for hidden knowledge, the contract is incomplete. Contract checks and example requests can protect integrations as the backend evolves.
Practical next step
The easiest API to maintain is one that makes normal use predictable and abnormal behavior explicit.
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