JSON Formatter
Format, validate and beautify JSON data instantly.
About JSON Formatter
What is JSON Formatter?
The JSON Formatter and Validator is a free online tool that instantly beautifies, formats, and validates JSON data. It takes minified or poorly formatted JSON and outputs it with proper indentation, making it easy to read and debug. The tool also validates syntax and highlights any errors so you can fix them immediately.
How to Use
- 1Paste your raw or minified JSON into the input area on the left.
- 2The formatted, indented JSON will appear on the right in real time.
- 3Switch to "Tree View" to explore nested objects and arrays interactively.
- 4Click "Copy" to copy the formatted JSON to your clipboard.
Frequently Asked Questions
Is my JSON data stored or sent to any server?
No. All JSON formatting and validation happens 100% in your browser. Your data never leaves your device.
What is the maximum size of JSON I can format?
Our tool can handle large JSON files up to several megabytes, although performance depends on your browser and computer memory.
Can I use this tool to validate JSON syntax?
Yes. The tool automatically checks for common syntax errors like missing commas or mismatched brackets and highlights them.
100% Private — Your Data Never Leaves Your Browser
All parsing is done using the native browser JSON.parse() and JSON.stringify() APIs with a 2-space indentation. No data is sent to any server.