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Mock API Generator

Paste OpenAPI/Swagger specs, GraphQL schemas, backend URLs, or natural language prompts to instantly generate structured, realistic mock API JSON responses.

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Paste Spec or Prompt

Enter YAML spec, GraphQL code, or prompts like "user login endpoint returning auth tokens."

Set Headers & Status

Configure response HTTP headers, cookies, delay simulation, and status code (200 OK, 400, 500).

Get JSON Response

Instantly obtain mock payloads containing realistic addresses, timestamps, and nested objects.

Why Use Mock API Generator?

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Parallel Development: Enable front-end teams to code layouts before backend integration completes.

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Simulate Error Statuses: Verify client error handling for unauthorized (401), missing (404), or server (500) bugs.

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OpenAPI Spec Parsing: Instantly map routes, variables, and payload models from existing schema scripts.

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High-Fidelity Mocking: Yields formatted emails, telephone structures, and names matching region expectations.

Frequently Asked Questions

Can I mock endpoints requiring pagination?

Yes. Describe your paginated structures (e.g., limit, offset, count) and the generator outputs appropriate arrays.

Is it possible to copy fields from real JSON?

Yes. Simply paste real JSON payloads in the prompt box and specify what variables should be randomized or mocked.

Can I simulate API delays?

The tool generates mock response payloads instantly. For network delays, you can use browser throttle profiles in dev tools.

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