JSON Formatter & Validator
Validate, format, and beautify JSON. Runs entirely in your browser — no data sent to server.
About the JSON Formatter
This JSON formatter beautifies minified JSON with proper indentation and validates it as you type, reporting the line and position of any syntax error. It runs in your browser, so API responses containing real data are never uploaded.
A JSON formatter turns an unreadable single line into an indented structure you can actually navigate. API responses, log entries and config files all arrive minified, and finding one field inside 4,000 characters of unbroken text is not realistic.
Validation is the other half. When JSON will not parse the reason is almost always small and specific: a trailing comma after the last item, a single quote where JSON requires double, an unescaped quote inside a string, or a missing closing brace. The error is reported with a position so you can go straight to it instead of scanning.
This matters for privacy too. API responses pasted into a formatter frequently contain customer records, tokens or internal identifiers. Formatting here happens in your browser and nothing is transmitted, logged or stored.
How to use the JSON Formatter
- Paste your JSON. Drop in the minified or malformed JSON.
- Read any error. If it will not parse, the line and position of the problem are shown.
- Format it. Produce indented, readable JSON.
- Copy or minify. Copy the formatted output, or minify it again for transport.
JSON Formatter features
- Indents minified JSON into a readable structure
- Validates as you type
- Reports the position of a syntax error
- Minify button to reverse the formatting
- Copy the formatted output
- Runs in your browser; API responses are not uploaded
Frequently asked questions
Why will my JSON not parse?
Almost always something small and specific: a trailing comma after the last item, single quotes where JSON requires double, an unescaped quote inside a string, or a missing closing brace. The error is reported with a position so you can go straight to it.
Does formatting change my data?
No. Only whitespace is added. Keys, values, ordering and structure are untouched, which is why minifying afterwards returns you to an equivalent document.
Is my JSON uploaded?
No. Parsing and formatting happen in your browser and nothing is transmitted, logged or stored. This matters more than it sounds, because API responses pasted into a formatter routinely contain customer records, tokens and internal identifiers.
Can I get the minified version back?
Yes, there is a minify button on the same page. Formatting and minifying are inverse operations on the same document, so you can move between them freely.
Can I download the formatted file?
There is no file download here — use the copy button and paste it where you need it. The JSON minifier works the same way.