How to Use Claude for Building an API
The exact prompt, setup, and codes to get great results.
The Problem
Building APIs involves dozens of decisions — authentication, error formats, pagination, versioning. Getting these wrong means painful migrations later.
The Prompt (Copy & Paste)
Design and implement a REST API for [RESOURCE/FEATURE]. Tech stack: [LANGUAGE + FRAMEWORK] Database: [DB TYPE] Auth: [JWT / API KEY / OAUTH] Consumers: [WHO WILL CALL THIS API] Requirements: [LIST WHAT THE API NEEDS TO DO] Include: 1. Route definitions with HTTP methods 2. Request/response schemas (TypeScript types or JSON Schema) 3. Input validation with helpful error messages 4. Error response format (consistent across all endpoints) 5. Pagination for list endpoints 6. Authentication middleware 7. Rate limiting considerations 8. Example curl commands for each endpoint Do NOT include: over-engineered abstractions, unused CRUD endpoints, or premature optimization.
Replace the [BRACKETED] placeholders with your specific details.
What You Get
A production-ready API design with consistent error handling, proper validation, and sensible defaults. Includes curl examples so you can test immediately. No over-engineering.
Prompt Codes That Help
Add these prefix codes to the start of your prompt for even better results:
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