How to Build a REST API
Design and implement a production-ready REST API with authentication, validation, and documentation.
What You'll Learn
This beginner-level guide walks you through how to build a rest api step by step. Estimated time: 14 min.
Step 1: Design your API resources
Identify resources, define URL patterns, and choose HTTP methods following REST conventions.
Step 2: Set up the project
Initialize your project with Express, Fastify, or Next.js API routes with TypeScript for type safety.
Step 3: Implement CRUD operations
Build Create, Read, Update, Delete endpoints with proper database queries and error handling.
Step 4: Add authentication and validation
Implement JWT or API key auth, request validation, and proper error responses.
Step 5: Generate documentation
Auto-generate OpenAPI/Swagger documentation from your route definitions for developer reference.
Frequently Asked Questions
REST or GraphQL?▾
REST for simple CRUD APIs and broad compatibility. GraphQL for complex data relationships and when clients need flexible queries.
How should I handle API versioning?▾
URL-based versioning (/api/v1/) is simplest and most widely understood. Add versioning from the start even if you only have v1.
What status codes should I use?▾
200 for success, 201 for created, 400 for bad request, 401 for unauthorized, 404 for not found, 500 for server errors. Be consistent.