JSON Formatter. Instantly readable.
Beautify and validate minified JSON, with clear error messages when something is malformed.
Your formatted JSON will appear hereHow to use JSON Formatter
Paste your minified JSON
Drop in a single-line API response, a log payload or a .json file. Unreadable one-liners are exactly what this is for.
Parsefy parses and re-indents it
Valid JSON is re-printed with two-space indentation. If it cannot be parsed you get the underlying syntax error instead of a silent failure.
Copy or download the result
Copy the formatted JSON back into your editor, or download it as a .json file.
Why use Parsefy JSON Formatter?
Your data never leaves your device
Everything runs in your browser tab — there is no upload step and no server to store anything. That makes it safe for API responses, database dumps and production data you could not paste into a hosted converter.
Format and validate in one step
If the output appears, your JSON is syntactically valid. If it does not, you get the parser's error message — so formatting doubles as a quick validity check.
No sign-up, no file-size tier
There is no account, no email wall and no paid plan gating bigger files. The only real limit is how much memory your own browser can spare.
Keeps working offline
Once the page has loaded, no network connection is required. Drop your Wi-Fi and the tool keeps running, which is handy on a plane or inside a locked-down corporate network.
JSON Formatter — frequently asked questions
How do I fix an "Unexpected token" error?
That message means the parser hit a character it did not expect at a specific spot. The usual culprits are a trailing comma after the last item, single quotes instead of double quotes, unquoted property names, or a stray closing brace. Our JSON Validator tool points at the exact line and column so you can jump straight to the problem.
Does formatting change my data?
No. Formatting only changes whitespace and indentation — keys, values, types and array order are all preserved exactly. One thing worth knowing: JSON objects cannot hold duplicate keys, so if your input has the same key twice, only the last one survives the round trip.
Can I paste JSON with comments or trailing commas?
Not directly. Comments and trailing commas are JSON5 and JSONC extensions that strict JSON does not allow, so the parser rejects them. Remove them first, or paste the file into the JSON Validator to find exactly where they are.
Is it safe to paste API keys or production payloads?
Yes. Formatting happens entirely in your browser and nothing is sent to a server, which is the main reason to use this instead of a hosted formatter when a payload contains tokens, personal data or internal identifiers.