JSON Formatter
Beautify JSON — instantly in your browser, nothing uploaded.
This free JSON formatter re-formats your JSON into clean, consistently-indented, readable output, entirely inside your browser so your code is never uploaded to any server. Just paste your JSON and the output appears instantly — then copy it or download it as a file. It is free, needs no signup, and works offline once the page has loaded.
Frequently Asked Questions
How do I format JSON?
Paste your JSON into the box above and the format JSON appears instantly below — nothing to press, nothing to upload. It runs entirely in your browser, so it is fast and private, and you can copy the output or download it as a file.
Is this JSON formatr free and private?
Yes. It is completely free with no signup or limits, and it is private because everything happens locally in your browser — your code is never sent to a server. That makes it safe for proprietary or unreleased code, and it keeps working offline once the page has loaded.
What does formating JSON do?
It re-formats your JSON into clean, consistently-indented, readable output. Readable, consistently-formatted code is easier to review and maintain.
Does it change my code's behaviour?
No — only the formatting changes; the code itself does exactly what it did before. You get the same functionality with cleaner, more readable output.
Is there a size limit?
There is no fixed limit because nothing is uploaded — the only constraint is your device's memory, so even large files process quickly on a normal computer. The engine loads on first use and is cached afterwards, so repeat runs are instant.
Does it work on mobile and every browser?
Yes. It runs in any modern browser on Windows, Mac, Linux, iPhone and Android with nothing to install, and works offline once loaded. The result can be copied or downloaded on any device.