JSON Formatter
JSON Input
Enter JSON and use actions to format, validate, or transform
Actions
Enter JSON and click an action button
Let us know
Please share your experience
4.9 (2.8k ratings)
About JSON Formatter
Format, validate, minify, and sort JSON online. Free JSON formatter and validator tool.
How to Use
Step 1
Paste your JSON into the input field
Step 2
Click 'Validate JSON' to check for syntax errors
Step 3
Click 'Format JSON' to beautify with indentation (choose 2, 4, or 8 spaces)
Step 4
Click 'Minify JSON' to remove all whitespace
Step 5
Click 'Sort Keys' to alphabetically sort object keys
Step 6
Click 'Convert to CSV' to convert JSON array to CSV format
Step 7
View statistics showing size, depth, keys, objects, and arrays
Step 8
Click 'Copy' to copy output, or 'Use Output' to use as new input
Features & Benefits
- ✅Validate JSON with detailed error messages
- ✅Show error line and column numbers for easy debugging
- ✅Format JSON with custom indentation (2, 4, or 8 spaces)
- ✅Minify JSON to remove all whitespace
- ✅Sort object keys alphabetically (recursive)
- ✅Convert JSON array to CSV format
- ✅Real-time statistics: size, lines, depth, keys, objects, arrays
- ✅Copy formatted JSON to clipboard
- ✅Use output as new input for chaining operations
- ✅Clear button to reset
- ✅Syntax highlighting with monospace font
- ✅Scrollable output for large JSON
- ✅Visual validation indicators (green for valid, red for invalid)
- ✅Detailed error messages with position information
- ✅100% browser-based - JSON never sent to server
- ✅100% free - no limits, no signup required
FAQs
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used for storing and exchanging data. It's human-readable and easy for machines to parse. JSON is widely used in APIs, configuration files, and data storage.
How do I know if my JSON is valid?
Click the 'Validate JSON' button. If valid, you'll see a green checkmark. If invalid, you'll see a red error message with the line and column number where the error occurred, making it easy to fix.
What's the difference between Format and Minify?
Format adds indentation and line breaks to make JSON human-readable (beautify). Minify removes all whitespace to make JSON as small as possible, which is useful for reducing file size in production.
What does 'Sort Keys' do?
Sort Keys alphabetically orders all object keys in your JSON, including nested objects. This is useful for comparing JSON files, version control, or maintaining consistent formatting.
Can I convert any JSON to CSV?
Only JSON arrays of objects can be converted to CSV. Each object becomes a row, and object keys become column headers. If your JSON is not an array of objects, you'll see an error message.
What do the statistics mean?
Size shows character count. Lines shows line count. Depth shows maximum nesting level. Keys shows total number of object keys. Objects shows count of {} objects. Arrays shows count of [] arrays.
What indentation should I use?
2 spaces is most common and compact. 4 spaces is popular in many style guides. 8 spaces is rarely used but available. Choose based on your project's coding standards.
Can I chain multiple operations?
Yes! After any operation, click 'Use Output' to move the result back to the input field. Then apply another operation. For example: Format → Sort Keys → Minify.
Why does validation fail?
Common reasons: missing quotes around keys, trailing commas, single quotes instead of double quotes, unescaped special characters, or missing closing brackets. Check the error message for the exact location.
Is my JSON data secure?
Yes! All JSON processing happens entirely in your browser using JavaScript. Your JSON never leaves your device and is not sent to any server, ensuring complete privacy and security.