Free Tool
JSONFormatter
Format, validate, and beautify JSON data. Essential tool for developers and API work.
JSON Input
Formatted JSON
Formatted JSON will appear here...
Format, validate, and beautify JSON data. Essential tool for developers and API work.
Formatted JSON will appear here...
JSON, short for JavaScript Object Notation, is the most common data format on the web. A JSON formatter takes a compact or malformed JSON string and pretty-prints it with consistent indentation so you can actually read the structure. It also catches syntax errors like missing commas or unbalanced brackets, which is the fastest way to debug an API response.
Drop in the raw response from an API, log file, or config file.
Click format. The tool indents every level and aligns keys for easy scanning.
If the JSON is malformed, the formatter highlights the offending line and character so you can fix it.
Switch to minify to strip whitespace before embedding JSON in a payload, URL, or HTML attribute.
Copy the formatted or minified output to clipboard in one click.
No. Formatting and validation run entirely in your browser. The data never leaves your device, which matters for sensitive payloads.
JSON is a subset of JavaScript object syntax with stricter rules: keys must be double-quoted strings, trailing commas are not allowed, and values can only be a fixed set of types.
Common causes are single quotes instead of double, trailing commas, unescaped newlines inside strings, or copying from a source that included smart quotes.
Most browsers comfortably handle files up to several megabytes. Past 10 MB the page may slow noticeably, since everything runs in the main thread.
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