JSON Formatter & Validator
Format, beautify, validate, minify, and sort JSON instantly. Everything runs in your browser.
Features
Format & Beautify
Pretty-print your JSON with proper indentation and syntax highlighting.
Minify
Compress JSON to a single line — perfect for API payloads and config files.
Validate
Check if your JSON is valid. Shows exact error location if invalid.
Sort Keys
Alphabetically sort all object keys at every nesting level.
Repair JSON
Fix common issues: trailing commas, unquoted keys, single quotes.
100% Private
Everything runs in your browser. No data is sent to any server.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. It is the most common format for APIs, configuration files, and data exchange between systems.
How to Format JSON
1. Paste your JSON into the input box above
2. Click "Format" to beautify or "Minify" to compress
3. Copy the output with one click
Common JSON Issues We Fix
- Trailing commas — JavaScript allows them, JSON doesn't
- Unquoted keys — {name: "John"} is invalid, {"name": "John"} is valid
- Single quotes — JSON requires double quotes
- Missing brackets — We detect and report unclosed brackets
Is This Tool Free?
Yes, 100% free. No signup, no limits, no watermarks. All processing happens in your browser — we never see your data.