JSON Mock Data Generator
Build your schema and generate realistic fake data instantly. 30+ types, presets, Web Worker-powered — everything stays on your device.
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Frequently Asked Questions
30+ types across 9 categories: Person, Internet, Location, Phone, Company, Finance, Data, Text, and Commerce. From UUIDs to credit cards to avatars.
Up to 100,000 rows. A Web Worker generates data off the main thread so the UI never freezes, even for massive datasets.
Yes. One-click presets for User, Product, Address, and Company schemas instantly configure realistic field combinations.
Yes. Add fields with custom names and choose from any of the 30+ data types. The schema editor lets you build exactly the structure your API needs.
All generation runs locally in your browser via a Web Worker. No data is sent to any server.