JSON Formatter & Prettifier
Format and prettify JSON with proper indentation instantly. Free online JSON formatter with syntax highlighting. Paste minified JSON and get readable output.
Frequently Asked Questions
What does JSON formatting do?
JSON formatting (prettifying) takes compact or minified JSON and adds proper indentation, line breaks, and spacing to make it human-readable. This tool uses 2-space indentation and applies syntax highlighting to keys, strings, numbers, and booleans.
How do I format minified JSON?
Paste your minified JSON into the input field. The tool automatically parses it with JSON.parse() and re-serializes it with JSON.stringify(null, 2) to produce properly indented, readable output with syntax highlighting.
Does this tool validate JSON while formatting?
Yes. The formatting process requires valid JSON. If your input contains syntax errors, the tool will display a clear error message indicating what went wrong and approximately where the error is located.
Can I customize the indentation level?
The default indentation is 2 spaces, which is the most common convention for JSON. The formatted output uses consistent indentation throughout the entire document.