$json formatter
Pretty-print or minify JSON with JSON.parse + JSON.stringify — so what comes out is exactly what a parser sees. Syntax errors are reported with the line and column they occur on.
Frequently asked questions
What does JSON Formatter do?
Format, validate and beautify JSON with collapsible nodes. The whole thing runs in your browser tab, so it is ready the moment the page finishes loading.
Is JSON Formatter free to use?
Yes. JSON Formatter is completely free on ToolMunch — no trial, no premium tier holding back the main feature, and no daily or hourly cap on how many times you can use it.
Do I need to create an account or sign up?
No. There is no account, no email address, and no login. Open JSON Formatter, do the job, and take the result — nothing is gated behind a signup form.
Is the code I paste in sent to a server?
No. JSON Formatter runs entirely inside your browser tab, so the code you paste stays on your own device. Nothing is uploaded, which means there is no copy of it on a server to worry about.
Does JSON Formatter work on Mac, Windows, and phones?
Yes. JSON Formatter runs in any modern web browser on Windows, macOS, Linux, Chromebook, Android, and iOS. There is nothing to download or install.
Can I use it as many times as I want?
Yes. There is no queue, no per-hour quota, and no counter that runs out — run JSON Formatter as often as the work needs.