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Build a custom schema and instantly generate mock JSON, CSV, or SQL data for testing — right in your browser.
1–1,000 rows per batch
Whether you're populating a database for a demo, writing unit tests, or prototyping an API response, this tool generates realistic-looking fake data without ever sending anything to a server. Define the fields you need, pick a type for each, and export in the format your project expects.
Is this data real or does it come from an API?
It's entirely fake. Every value is generated locally in your browser using JavaScript's Math.random() and a small built-in word bank — nothing is fetched from a server or API.
How many rows can I generate at once?
Up to 1,000 rows per generation. For larger datasets, generate in multiple batches and combine the output.
Can I generate SQL for any database?
The generated INSERT statements use standard ANSI SQL syntax, which works with MySQL, PostgreSQL, SQLite, and most other relational databases with little or no adjustment.
Can I get the same data again next time?
No. Every click of Generate produces new random values, and there is no seed option. If you need a fixed dataset for repeatable tests, download or copy the output and keep that file.
What happens to the schema I build?
Nothing leaves your device. Your field definitions and generated output live only in your browser's memory and disappear when you close or refresh the page.
Can I use this data in production?
No — it's randomly generated test data intended for development, demos, and QA. Don't use it as a substitute for real user records or production content.
All data generation happens locally in your browser. No schema, field names, or generated rows are ever uploaded or stored on our servers.