JSON Formatter & Validator
Paste JSON below — the tool pretty-prints it with your chosen indentation, validates the syntax and pinpoints the exact line of any error. “Minify” strips all whitespace for production use.
How to use
Paste your JSON and hit “Format”. Invalid documents don't fail silently: the validator reports the line and column of the first problem — an unclosed quote, a trailing comma, a missing bracket.
Everything runs client-side in your browser. API responses, config files and tokens never leave your machine, which makes the tool safe for work data.
FAQ
Why is my JSON invalid?
The usual suspects: a trailing comma after the last item, single quotes instead of double quotes, unquoted keys, or comments (standard JSON has none). The validator points at the first offending line.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks so humans can read the structure. Minify removes all insignificant whitespace to shrink the payload — the form you ship over the network.
Is it safe to paste production data here?
Yes. Parsing and formatting run in JavaScript inside your browser; nothing is uploaded or logged. You can disconnect from the internet and the tool keeps working.
How large a JSON file can it handle?
The limit is your browser's memory — documents of tens of megabytes format fine. For very large files, minifying is faster than pretty-printing.