What this tool does
API Mock Generator creates example success, list, paginated, and error responses from a simple schema.
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🧪 API Mock Generator
Generate realistic mock JSON responses from endpoint, method, response style, and field schema.
Why it is useful
It helps teams prototype front ends, docs, tests, and integrations before a real service is ready.
How it works
The browser converts field definitions into deterministic sample data and a matching TypeScript interface.
Best input
Provide realistic field names, types, and edge cases that match the API you plan to build.
Testing tip
Generate error and pagination examples so clients do not only handle the happy path.
Privacy note
Mock payload creation happens locally in your browser.
Important limitation
Generated examples are not contracts. Treat them as drafts until the real API schema, validation rules, and error model are defined.
Quick answers
What field types work?
Use string, number, boolean, email, date, uuid, url, array, or object. Unknown types become strings.
Can mocks become docs?
Yes, after review and alignment with the real API contract.
Common Use Cases
Prototype a front-end screen
Generate list, object, or paginated JSON so UI work can start before the backend endpoint exists.
Document success and error shapes
Copy realistic success payloads and validation errors into API docs, tickets, or mock server fixtures.
Sketch a TypeScript interface
Turn field names and types into a first-pass interface that teammates can review against the final contract.