JSON API Response Generator – Mock API Responses
Generate realistic mock API JSON responses with status codes, data payloads, and pagination. Our free tool speeds up frontend development and API testing without a live backend.
About JSON API Response Generator
Frontend development often waits on backend APIs. This tool generates realistic mock API responses with proper structure including status, data, pagination, and metadata so you can build and test without a live backend.
How it works
Choose your response status, number of data items, and optional sections like pagination and metadata. The generator creates a complete API-style response with realistic sample data.
Each data item includes an id, name, and random value. Pagination metadata calculates correct page numbers and totals based on your settings for authentic API behavior.
When you'd use this
You're building a React component that displays paginated user data. Generate a mock response to test your component's rendering and pagination logic before the API is ready.
The generated data is randomized and generic. For testing specific scenarios or edge cases, you'll need to manually edit the output or use more advanced mock data tools.
Questions
What status types are available?
Success, error, and warning statuses are available. Each generates an appropriate message and structure for that response type.
Can I customize the data fields?
The basic generator creates id, name, and value fields. For custom field structures, generate the response then edit it manually.
How does pagination work?
Enable pagination to include page, limit, total, and totalPages fields. The generator calculates correct values based on your item count.
What's in the metadata section?
Metadata includes a timestamp, API version, and unique request ID. These help with debugging and tracking API calls in production.
Can I download the response?
Yes. Use Download to save as a JSON file or Copy to paste into your mock server or test fixtures.