JSON Formatter
Paste JSON to pretty-print it, minify it, or check it for errors — mistakes are reported with the exact line and column. Everything runs in your browser.
- Free
- No sign-up
- Runs in your browser
Guides for this tool
All guidesJSON formatting best practices
JSON is the lingua franca of modern APIs, configuration files, and log exports. Readable indentation helps teams review diffs during code review, while validation catches trailing commas, mismatched braces, and accidental single quotes early. This formatter keeps parsing in the browser so typical payloads never need to leave your machine—still, treat highly sensitive tokens carefully on any online page.
Use consistent tab or space width to match your repository style guide. When integrating with CI systems, prefer deterministic sorting or schema validation in addition to cosmetic formatting. For extremely large documents, consider chunking operations or collapsing sections in your editor to avoid blocking the main thread while pretty-printing millions of lines.
Explore neighboring utilities for minification, Base64 encoding, CSV conversion, and SQL exports when you need to move the same structured data across systems. If you need the same data as CSV or YAML, the Convert menu above does it in one click.