About Prettify JSON
Takes minified JSON — the kind that arrives as one long unreadable line — and pretty-prints it with indentation and line breaks. If the JSON is malformed, it tells you where instead of failing silently.
Where it actually saves you time: pasting a curl or webhook response you can't parse, reviewing a config file in a pull request, or hunting for the one wrong comma in a long export. Indentation is your call — 2 spaces, 4 spaces, or tabs — and you can copy or download the result once it looks right.
Everything runs in the browser, which matters if the JSON you're formatting came from an API and contains tokens or personal data you'd rather not send to a random website.
Frequently Asked Questions
What is a JSON formatter?
A JSON formatter (or JSON beautifier) takes minified JSON — a single unreadable line — and pretty-prints it with indentation and line breaks so the structure is easy to read and debug. This tool also validates your JSON and reports syntax errors.
How do I fix an "Invalid JSON" error?
Turn off live mode and click "Format JSON" to see the exact error message and location. Common mistakes are trailing commas, single quotes, unquoted keys, and mismatched braces or brackets. Fix the reported line and re-format.
What indentation should I use — 2 spaces, 4 spaces or tabs?
Either works for valid JSON. 2 spaces is the most common convention in JavaScript projects, 4 spaces is common in Java and Go, and tabs are a personal or team preference. You can switch freely and re-format.
Is my JSON uploaded anywhere?
No. Formatting and validation happen entirely in your browser. Your JSON never leaves your device, so you can safely format API responses containing tokens or personal data.