JSON Formatter – Format, Validate, and Minify JSON Online
Format, validate, and minify JSON online. See errors clearly, sort keys, choose indent size, and copy results — all client-side.
No uploads. Everything runs locally in your browser.
Format, validate, and minify JSON with clear error messages, key sorting, and copy-ready output. Everything runs locally in your browser.
Tip: keep input small enough for your device; large JSON stays local but may be slow on low-end hardware.
Formatted, minified, or validated JSON will appear here.
What is this tool
This JSON formatter formats, validates, and minifies JSON directly in your browser. It adds indentation for readability, sorts keys if you want deterministic output, and surfaces parser errors clearly.
Use cases
- Beautify API responses for debugging or documentation.
- Validate config files before deploying.
- Minify payloads for storage or transport.
- Sort keys for stable diffs in version control.
- Clean copied JSON before sharing with teammates.
Popular ways to use this tool
How to use
- Paste your JSON into the input box.
- Pick indent size, optional key sorting, then click Format or Minify.
- Use Validate to catch errors, then copy or download the cleaned JSON.
Features
- Pretty-print with customizable indent
- Validation with readable error messages
- Minify output and optional key sorting
- Sample loader, copy, and clear actions
- Runs entirely in your browser
FAQ
Is this free?
Yes. It runs in your browser with no uploads.
Do you store my JSON?
No. All parsing and formatting happen locally.
Can I choose indent size?
Yes. Select 2 or 4 spaces before formatting.
Can I sort keys?
Yes. Toggle sort keys to alphabetize object properties.
Do you show errors?
Invalid JSON shows the parser message so you can fix it quickly.