JSON Formatter
Format, validate, and beautify JSON data online
About the JSON Formatter
The JSON Formatter beautifies, validates and minifies JSON. Developers use it to read API responses, debug configuration files and spot syntax errors quickly.
How it works
Your input is parsed with the browser's built-in JSON parser, which follows the official specification (RFC 8259). If it's valid, it is printed with 2-space indentation (Format) or with all whitespace removed (Minify). If not, the parser's error message tells you what went wrong.
How to Use JSON Formatter
Enter Your Data
Paste your JSON.
Run the Tool
Press Format to beautify or Minify to compress it.
Use the Result
Copy the result, or fix any error shown.
Why Use Our JSON Formatter?
100% Free
No registration, no hidden fees, no limits — ever.
Privacy First
All processing runs in your browser. Your data never leaves your device.
Mobile Friendly
Works perfectly on phones, tablets, and desktops.
Instant Results
Results appear as soon as you run the tool.
Frequently Asked Questions
Q. Why is my JSON invalid?
The most common causes are trailing commas, single quotes instead of double quotes, and unquoted keys. Those are allowed in JavaScript but not in JSON.
Q. Is my data sent to a server?
No. Parsing and formatting happen in your browser.
Q. When should I minify JSON?
When sending or storing it, to save bandwidth and space. Keep the formatted version for reading and editing.