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Designing Reliable REST APIs
A checklist for predictable resources, validation, error responses, pagination, and version-safe API evolution.
By Junaid HossainJuly 12, 20266 min read
Design around resources
Use consistent resource names and let HTTP methods describe the operation. Predictable routes reduce documentation needs and make client integrations easier to maintain.
GET /api/orders
POST /api/orders
GET /api/orders/{order}
PATCH /api/orders/{order}
DELETE /api/orders/{order}Return consistent responses
Success and error payloads should follow stable shapes. Include machine-readable error codes, human-readable messages, and field-level validation details where appropriate.
- Use correct HTTP status codes
- Paginate collections from the beginning
- Expose identifiers instead of database internals
- Document filtering and sorting conventions
Evolve without breaking clients
Prefer additive changes. New optional fields are usually safe, while renamed fields or changed types require a migration strategy. Contract tests help detect accidental changes before deployment.