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Random JSON Generator — Free Fake & Mock Test Data

Generate fake JSON from a schema using faker.js. Multi-output: JSON, CSV, TSV, XML. Free, runs in your browser.

Free No signup Client-side Privacy friendly Updated

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How to use

  1. 1 Define a JSON schema — each leaf value is a faker.js dot-path like person.fullName, internet.email or number.int({min:18,max:65}).
  2. 2 Set the count slider (1–1000) and pick an output format: JSON, CSV, TSV or XML.
  3. 3 Hit Generate to produce random records. Re-roll any time for new values.

Why use this tool

  • Schema-driven — your fields stay yours, only the values are randomized.
  • Powered by @faker-js/faker — modern, locale-aware, hundreds of generators.
  • Faker bundle is lazy-loaded — page is light until you click Generate.
  • Output to JSON, CSV, TSV or XML — drop straight into a database seeder or test fixture.

Frequently asked questions

What dot-paths can I use?

Anything under <code class="font-mono text-xs">faker.*</code> — for example <code class="font-mono text-xs">person.firstName</code>, <code class="font-mono text-xs">company.name</code>, <code class="font-mono text-xs">finance.iban</code>, <code class="font-mono text-xs">date.past</code>. See the faker.js docs for the full list.

Can I pass arguments?

Yes — wrap the argument object in parentheses. Example: <code class="font-mono text-xs">number.int({min:1,max:100})</code> or <code class="font-mono text-xs">helpers.arrayElement(["a","b","c"])</code>.

Where does the data come from?

Everything runs in your browser — faker.js generates locally, no API calls. Your schema and data never leave your device.

What is Random JSON Generator?

A Random JSON Generator is a tool that produces fake JSON data from a defined schema using a faker library. It fills fields with synthetic sample values for testing and mocking, and can output the generated records as JSON, CSV, TSV, or XML. It runs entirely in the browser with no signup or server-side processing.

Features

Schema-driven

Map each key to a Faker method to control exactly what synthetic data is produced.

Multi-format export

Output the generated records as JSON, CSV, TSV, or XML.

Bulk records

Generate arrays of mock objects for seeding, testing, and demos.

100% private

Runs client-side — your schema and data never leave the browser.

Example

Input

{"name":"person.fullName","email":"internet.email"}

Output

{"name":"Jordan Reynolds","email":"jordan.reynolds@example.com"}   (values are random each run)

Common use cases

  1. 1

    Seed a dev database

    Generate realistic mock users, orders, or products to populate a test environment.

  2. 2

    Mock an API response

    Produce a JSON array shaped like a real endpoint for frontend development.

  3. 3

    Build demo datasets

    Create believable-looking sample data for prototypes and screenshots.

Summary

Zerethon's random JSON generator builds fake data from a schema you define, using the Faker library in your browser. Each field references a Faker method (like person.fullName or internet.email) and the tool fills it with synthetic values, exporting as JSON, CSV, TSV, or XML. Output is random, so every run produces fresh records; nothing is uploaded.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. Random JSON Generator runs entirely client-side — no server upload, no logging, no tracking of your input.

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