Free online JSON formatter and validator. Format, minify and validate JSON with syntax highlighting and instant error detection.
Formatted output will appear hereCopy your JSON data from any source (an API response, config file, or database export) and paste it into the input panel.
Click 'Format' to beautify with proper indentation, 'Minify' to compress into a single line, or 'Validate' to check for syntax errors.
Switch between 2 spaces, 4 spaces, or tab indentation to match your project's coding style.
Click the Copy button to copy the formatted or minified JSON to your clipboard, ready to use.
Yes. Everything runs in your browser. No JSON data is ever sent to our servers or stored anywhere.
There's no hard limit. The tool handles JSON files up to several megabytes. Very large files may take a moment to process.
Standard JSON doesn't support comments. If your data contains comments, they'll need to be removed first for valid JSON parsing.
Minifying removes all whitespace, newlines, and indentation from your JSON, producing the most compact representation. This is useful for reducing file size in production.
No. The formatter works on tokens and copies every number through exactly as written, so 1.50 stays 1.50 and a long id keeps all of its digits.
Yes. Turn on the sort keys option and every object is ordered alphabetically at every level, which makes two versions of the same file much easier to compare.
JavaScript loses precision on integers above 9,007,199,254,740,991. When your JSON contains one, the tool points it out instead of quietly rounding it.
The error gives the line and column where parsing stopped. A trailing comma or a single quote instead of a double quote causes most of them.
Indent queries, mutations and SDL, keeping arguments, strings and comments intact.
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