API Response Builder
Design and build mock API responses with proper JSON structure. Choose status codes, configure headers, select response templates, and generate realistic sample data. Perfect for API prototyping and front-end development.
2xx Success
Standard response for successful HTTP requests.
Response Headers
Response Body
Resource Type
Full Response Preview
HTTP/1.1 200 OK
About API Response Builder
This tool helps developers design and prototype API response structures before implementing them in a back-end service. Build realistic mock responses with proper HTTP status codes, headers, and JSON body structures. Use it for API documentation, front-end development, and team communication about API contracts.
Features
- HTTP status code selector with descriptions for all common codes
- Response headers builder with add/remove and common header presets
- Multiple response templates: success, error, paginated, single resource, collection
- Resource type tabs: User, Product, Blog Post, Error, Paginated
- Generate realistic sample data with a single click
- Full HTTP response preview with status line, headers, and body
- Copy individual sections or the full response
- JSON formatting and validation
- 100% client-side — your data never leaves your browser