Developer & Security
Format, validate and shrink JSON right in your browser. Syntax errors are shown with their line and column. Your data is never sent to a server.
Free · no sign-up · runs in your browser · updated
Numbers with more than 15 digits can lose precision when processed.
Paste your JSON into the input box.
Click Format to pretty-print, Minify to compress, or Validate to check only.
Copy the result or download it as a .json file.
Object keys must use double quotes. Strings use double quotes, not single quotes. The last item in an array or object must not be followed by a comma. JSON also does not allow comments, and values such as undefined or NaN are not recognized.
Use Validate to find the line and column with the problem, then fix it from there. An error is often detected a little after its real cause, so check the previous lines too.
Format (pretty print) makes JSON easy to read when you inspect API responses or configuration files. Minify removes spaces and line breaks to shrink the size before you send or store it.
The most common causes are keys without double quotes, single quotes, a trailing comma, or comments. The error message shows the line and column where the parser stopped.
No. The JSON standard (RFC 8259) does not allow comments. Remove them before you validate.
JSON is a stricter text format: keys must use double quotes, and functions, comments and trailing commas are not allowed.
It removes spaces and line breaks so the size is smaller. That helps with API payloads, storage, or pasting JSON on a single line.
The data is processed in your browser and is not sent to our servers. Even so, avoid pasting production secret keys into any website.
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