This free Jackson-style JSON generator lets developers create large-scale JSON datasets directly in the browser using a streaming architecture. Ideal for API testing, database seeding, and load testing with 100,000+ records.
This tool uses a Jackson JsonGenerator-style streaming architecture to create JSON data incrementally. Unlike traditional generators that build entire objects in memory, our streaming approach writes JSON sequentially, enabling generation of massive datasets without crashing your browser.
Unlike traditional JSON generators, this tool does not create large in-memory objects. It writes JSON incrementally using streaming buffers and Blobs, similar to Jackson's JsonGenerator API in Java.
A streaming JSON generator creates JSON data incrementally without loading the entire dataset into memory. This allows generation of massive files (100MB+) without crashing the browser, similar to how Jackson's JsonGenerator works in Java.
This tool uses Web Workers and streaming architecture to generate 100,000+ records while keeping the UI responsive. The actual limit depends on your browser's memory, but we've tested up to 1 million records successfully.
UUID, incrementing integers, random strings, names, emails, phone numbers, dates, timestamps, addresses, company names, booleans, and random numbers. You can combine these to create custom schemas.
Yes, all JSON generation happens entirely in your browser using JavaScript. Your data never leaves your computer and is not sent to any server.