JSON formatter and validator
Paste your JSON, format it, validate it, or minify it — all in your browser, nothing uploaded to any server.
🔒 100% private — all parsing happens on your device, nothing is uploaded to any server.
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1. Paste your JSON
Type or paste the text directly into the box.
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2. Format or validate
Give it readable formatting, minify it, or check for errors.
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3. Copy the result
One click and it's on your clipboard, ready to use.
How it works
The formatter parses the text you paste using the browser's own JSON engine. If it's valid, "Format" rewrites it with 2-space indentation so it's easy to read, and "Minify" does the opposite: it strips all extra whitespace so it's as small as possible. If it's not valid, we tell you exactly which line and column the problem is on.
Why it's private
There's no server involved: parsing happens in your browser with JavaScript. Nothing you paste here is sent anywhere, so you can use it with sensitive data without worrying.
Frequently asked questions
Is my JSON uploaded to a server?
No. All parsing and formatting happens in your browser, with JavaScript. Nothing you paste here is sent anywhere.
What's the difference between format and minify?
Formatting adds indentation and line breaks so the JSON is easy to read. Minifying does the opposite: it strips all unnecessary whitespace so the file is as small as possible, useful for production.
What happens if my JSON has an error?
We tell you exactly which line and column the problem is on, along with the error message, so you can find and fix it fast.