JSON Formatter

Format, validate, beautify and minify JSON online. Shows the exact line and column of syntax errors. Free and private.

Input JSON

Indent Sort keys

Output

Paste JSON to pretty-print it with consistent indentation, minify it to a single line, or check whether it is valid. If there is a syntax error, the formatter shows the line and column so you can find it quickly.

Common JSON errors

Trailing commas after the last item in an object or array.
Single quotes instead of double quotes around strings and keys.
Unquoted keys, comments, or values like undefined and NaN, which JSON does not allow.

Questions

Is my JSON sent to a server?

No. Parsing and formatting happen in your browser, so it is safe for API keys and private data.

What does “Sort keys” do?

It orders the keys of every object alphabetically, which makes two JSON documents easier to compare.

Can it handle large files?

Yes, files of several megabytes format in under a second on most devices.