Developer tool
Your files never leave your device
Check your Network tab and see
Work starts the moment you drop a file
No daily limit, no sign-up, no watermark
The same { id, name, active, tags } shape is returned every time and does not respond to prompts or a count. Treat it as a copy-and-edit starting point rather than a data generator.
No HTTP server or endpoint is created — you get a JSON snippet, not a live URL. Pair it with a mocking library or a static file if you need a fake API.
The snippet is produced in the page and nothing is stored or transmitted, so it is safe to use inside private projects.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.
Format, validate, prettify and beautify your JSON data instantly.
Flatten an array of objects to CSV.
Format and parse YAML.
Generate valid universally unique identifiers (UUIDs/GUIDs) instantly.
Test, visualize, and debug Regular Expressions instantly in your browser.
Encode to Base64 or decode from Base64 instantly in your browser.
