JSON Tools for AI Developers · Runs locally

For AI developers JSON Workbench

Natural language generation · Schema · Zod · OpenAPI · Function Calling · MCP · 30+ tools

JSON Mock

While the frontend waits on an API, one correctly shaped fake record is enough to build the page.

Paste a template: numbers, booleans, and strings get new values by type. Or leave it empty for a random object.

This is not a full faker stack. Emails and dates look plausible; business enums still need a human edit.

Generation stays local. No mock service is required.

The template decides the shape

Keys are kept; values change. Get the template's field set right, then generate.

One record vs a batch

Use this page to see if a single record looks right. Use Batch mock for lists, pagination, and light load tests, up to 100 records.

How to use it

  1. Paste a JSON template, or leave it empty and load a sample.
  2. Click Generate Mock and check that values changed by type.
  3. Edit enums, status codes, and currency symbols by hand.
  4. Copy into the frontend or Storybook.
  5. Once the shape is right, take the same template to Batch mock for an array.

When to use it

  • A single record while the page skeleton has no API.
  • After Schema generate, swap values for a visual check.
  • Avoid real user profiles in a demo.
  • Pairs with AI generate: that page starts from a description, this one from a template.

Keep in mind

  • This is not seeded randomness. Don't treat it as a snapshot golden file.
  • It does not call a network mock platform.
  • The template is not uploaded.

FAQ

Are original field names kept?

Yes. Values change; keys do not.

How is this different from AI generate?

AI generate starts from a description. Mock swaps values on an existing template.

Can I generate many records at once?

This page is one record. Use Batch mock for an array.

Is the template uploaded?

No.

Is every generate the same?

Values change. Don't use this as a snapshot golden file unless you freeze the output yourself.

Can it emit localized names?

Common fields try to look right. For a specific last name or city, edit by hand or swap the template.

Are nested objects filled too?

Yes, it walks types downward. Enums and fixed copy should still be edited.

How does this work with Schema?

Generate a Schema from a sample, Mock from the template, then Validate.

Related tools

Batch mock AI generate JSON JSON Schema Back to the Workbench →