JSON Formatter
format · beautify · validate · minify
// formatted output will appear here...$ how-to-use
Paste or type your JSON in the editor. Click Format to beautify with proper indentation, Minify to compress, or Validate to check for errors. Choose between 2-space, 4-space, or tab indentation.
What This Tool Does
JSON (JavaScript Object Notation) is the standard data format for APIs, config files, and data exchange. But raw JSON from APIs often comes as a single unreadable line. This formatter turns that mess into properly indented, human-readable code.
The validator catches syntax errors instantly — missing commas, unmatched brackets, invalid escape sequences. Instead of hunting through thousands of characters for a single misplaced comma, let the tool pinpoint exactly where the error is.
Minification strips all whitespace to create the smallest possible JSON string — ideal for reducing payload size in API requests and storage.
Features
Format & Beautify
Indent with 2 spaces, 4 spaces, or tabs. Adds line breaks and proper nesting for readability.
Validate
Checks JSON syntax and reports the exact error location. Catches missing commas, brackets, quotes, and invalid values.
Minify
Strips all whitespace for the smallest possible output. Reduces file size for API payloads and storage.
100% Client-Side
Everything runs in your browser. Your JSON data never leaves your device — safe for sensitive configs and API keys.
FAQ
What's the max JSON size?
It depends on your browser's memory. Most modern browsers handle JSON files up to 50-100MB without issues. For extremely large files, consider using a local tool like jq.
Is my JSON data private?
Yes. Everything runs in your browser. No data is transmitted to any server. Safe for API keys, tokens, and sensitive configuration files.
Can it fix invalid JSON?
The tool validates and reports errors but doesn't auto-fix them. It shows you exactly where the error is so you can correct it manually. Common fixes: add missing commas, close brackets, or wrap keys in double quotes.