Developer ToolsFree Tool

JSON Mock Data Generator

Provided byDevBoltdevbolt.dev

Generates realistic fake JSON data for API testing with 30+ field types and schema builder.

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Screenshot of JSON Mock Data Generator on DevBolt
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About this tool

What JSON Mock Data Generator does

The JSON Mock Data Generator on DevBolt is a browser-based tool that creates realistic placeholder JSON payloads for API development and testing. Users define a schema by selecting from over thirty field types—ranging from names and emails to dates, UUIDs, and custom patterns—or choose from preset templates like Users, Products, or Orders. The tool produces up to 500 rows of structured data instantly, with results formatted as valid JSON that can be downloaded as a file or copied to the clipboard. Because all processing occurs locally in the browser, no API keys or server connections are required, making it suitable for offline or secure environments.

Step by step

How to use the DevBolt JSON Mock Data Generator

  1. 1

    Open the JSON Mock Data Generator on DevBolt

  2. 2

    Select a template or define a schema by choosing field types and names

  3. 3

    Specify the number of rows to generate (up to 500)

  4. 4

    Copy the output to the clipboard or download as a .json file

Is it right for you

Best for

Developers and testers who need quick, realistic JSON payloads for API prototyping without setting up a server or writing seed scripts.

Limitations

  • No unit conversion or locale switching beyond preset field types
  • Custom patterns require manual input; no regex builder shown
  • Output is static sample data and does not connect to live APIs
Questions

JSON Mock Data Generator FAQ

Can I generate data for specific data types like dates or UUIDs?
Yes, the tool includes over thirty field types such as Date (YYYY-MM-DD), DateTime (ISO), Unix Timestamp, and UUID, which can be added to a custom schema or selected from preset templates.
Is there a limit on how many rows I can generate at once?
The generator allows up to 500 rows of mock data per session; larger volumes would require multiple runs or a different approach.
Do I need to install anything or create an account to use the tool?
No installation or account is required; all generation happens in the browser and the site notes that data never leaves the user's device.
Can I save or export the generated JSON for later use?
Results can be downloaded as a .json file or copied to the clipboard for immediate pasting into code or API testing tools.
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