JSON Formatter
Beautify and pretty print JSON with 2 spaces, 4 spaces, or tabs. Syntax-highlighted output, copy and download in one click.
Free online developer tools
Fast, simple, and privacy-friendly. Format, validate, and minify JSON right in your browser — no uploads, no sign-up, no nonsense.
No sign-up
No uploads
No tracking
The tools
Everything you need to work with JSON — and each tool is a fast, focused page that does one job well.
JSON Validator
Check JSON syntax and find errors instantly, with the exact line and column of every problem highlighted live as you type.
JSON Minifier
Compress JSON by stripping all unnecessary whitespace. See exactly how much you saved before you ship it.
Why JSONKit?
Fast by design
No accounts, no uploads, no round-trips. Every tool runs locally in your browser, so results appear the instant you act.
Privacy-friendly
Your data never leaves your device. No uploads, no cookies, no tracking scripts — paste sensitive JSON without a second thought.
Free, forever
Every tool is completely free with no sign-up and no usage limits. Bookmark it and it will simply work.
Frequently asked questions
Are these tools really free?
Yes — completely. No sign-up, no usage limits, no premium tier hiding the useful parts. JSONKit exists to be the fastest way to do small JSON jobs.
Do you store or upload my data?
Never. All processing happens in your browser with JavaScript. Your input is not sent to any server, not logged, and not stored — it disappears when you close the tab.
Do I need to install anything?
No. JSONKit is a website: open a tool, paste your data, done. Once a page has loaded it even works offline, because everything it needs is already in your browser.
Which JSON formats are supported?
Strict JSON as defined by RFC 8259 — the same rules used by browsers, Node.js, and virtually every API. That means no comments, no trailing commas, and double-quoted keys. If it parses here, it parses anywhere.
Will more tools be added?
Yes. JSONKit starts with the JSON essentials — formatter, validator, minifier — and grows from there. The architecture is ready for more tools without any slowdown.