About Dummy JSON Generator

A free, open, developer-first tool for generating realistic test data.

Dummy JSON Generator was built out of frustration with slow, bloated data generators that required signups, imposed rate limits, or sent your configurations to a server.

Everything runs in your browser. Your schemas are stored locally. Your data never leaves your machine. There's no backend, no account, and no cost — ever.

It's designed for developers who need realistic seed data for databases, test fixtures for unit tests, mock API responses for frontend development, or bulk data for load testing.

Features

  • 30+ field types across 8 categories
  • JSON, CSV, and SQL export formats
  • Up to 1,000,000 records per generation
  • Save and reload schemas via localStorage
  • Copy to clipboard or download as a file
  • Dark and light theme support