Building REST APIs with JSON: From Basics to Production

REST APIs with JSON are the backbone of modern web applications. This guide walks you through building production-ready JSON APIs.

REST Basics with JSON

REST (Representational State Transfer) uses standard HTTP methods with JSON payloads:

GET /api/users — List users

GET /api/users/1 — Get single user

POST /api/users — Create user

PUT /api/users/1 — Update user

DELETE /api/users/1 — Delete user

Request and Response Format

POST Request to create a user:

{
  "firstName": "Jane",
  "lastName": "Smith",
  "email": "jane@example.com",
  "role": "developer"
}

Success Response (201 Created):

{
  "id": 42,
  "firstName": "Jane",
  "lastName": "Smith",
  "email": "jane@example.com",
  "role": "developer",
  "createdAt": "2026-01-15T10:30:00Z"
}

Filtering, Sorting, and Search

Use query parameters for flexible data access:

GET /api/users?role=developer&sort=-createdAt&limit=20

Rate Limiting

Include rate limit headers in responses:

{
  "data": [...],
  "rateLimit": {
    "remaining": 95,
    "limit": 100,
    "resetAt": "2026-01-15T11:00:00Z"
  }
}

HATEOAS Links

Include navigation links for discoverability:

{
  "data": {"id": 1, "name": "Alice"},
  "links": {
    "self": "/api/users/1",
    "posts": "/api/users/1/posts",
    "avatar": "/api/users/1/avatar"
  }
}

Best Practices Summary

Use plural nouns for endpoints (/users not /user)

Return consistent error format

Version your API (/api/v1/)

Support filtering and pagination

Include proper Content-Type headers

Use our JSON Formatter to format API responses and JSON Validator to verify request payloads.