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JSON Formatter & Validator
Format, validate, minify and beautify JSON data — instantly, free, no login.
✓ Free✓ No Login✓ Syntax Highlighting✓ Validates Errors✓ Private
Indent:
📚 JSON Quick Reference
String"hello world"
Number42 / 3.14
Booleantrue / false
Nullnull
Array[1, 2, 3]
Object{"key": "value"}
⚠️ Common JSON Errors
✕Trailing comma after last item
✕Single quotes instead of double quotes
✕Missing comma between items
✕Unquoted key names
✕Unclosed bracket or brace
📖 How to Use the JSON Formatter
1
Paste Your JSON
Copy your raw or minified JSON and paste it into the input box. You can also click 'Load sample JSON' to try it out.
2
Choose an Action
Click Format to beautify with proper indentation, Minify to compress it, or Validate to check for errors without changing anything.
3
Copy or Download
Your formatted JSON appears with colour syntax highlighting. Click Copy to use it anywhere, or ⬇ .json to save it as a file.
❓ Frequently Asked Questions
What is JSON and why do I need to format it?+
JSON (JavaScript Object Notation) is a format for storing and exchanging data. Raw JSON is often minified (compressed) and very hard to read. Formatting adds indentation and line breaks so humans can read and debug it easily.
Does this tool validate my JSON?+
Yes! If your JSON has any errors — missing commas, unclosed brackets, wrong quotes — the tool will detect it and show you exactly what went wrong so you can fix it instantly.
What is JSON minifying?+
Minifying removes all whitespace and line breaks from JSON, making it as small as possible. This is useful when sending JSON over a network or storing it, as smaller files load faster.
Is my JSON data safe?+
Completely. All processing happens in your browser — your JSON is never sent to any server. It stays 100% private on your device.
Can I format very large JSON files?+
Yes. The tool handles large JSON files with thousands of lines. Simply paste the entire content and it formats instantly.