Paste your JSON. Get it formatted, validated, and visualized. Runs locally — nothing leaves your browser.
A JSON formatter takes minified or messy JSON data and reformats it with proper indentation and line breaks, making it human-readable. This tool also validates your JSON, catching syntax errors like missing commas, unmatched brackets, and invalid values. Everything runs locally in your browser — your data never leaves your device.
Paste or type your JSON into the input panel. Click "Format JSON" to pretty-print it with 2-space indentation. Use "Minify" to compress it down to a single line. The validator will tell you exactly where any syntax errors are.