JSON Formatter
Paste your JSON, then format, minify, or validate it instantly — free, private, and processed entirely in your browser.
About the JSON Formatter
Our free online JSON formatter and validator lets you prettify, minify, and check the syntax of JSON data instantly. It's useful for debugging an API response, cleaning up a config file, or shrinking JSON down to its smallest size before shipping it to production.
Every operation runs entirely inside your browser using the native JSON parser — your data is never uploaded to a server, so it stays completely private and secure.
How to Use the JSON Formatter
Step 1
Paste your JSON
Type or paste any JSON text into the editor.
Step 2
Format, minify, or validate
Click "Format / Prettify" for readable, indented JSON, or "Minify" to compact it onto one line.
Step 3
Copy the result
Click "Copy to Clipboard" to grab the formatted or minified JSON instantly.
Frequently Asked Questions
Does it validate my JSON as I type?
Yes. The tool checks your JSON in real time and shows a clear error message if the syntax is invalid, along with a "Valid JSON" indicator once it parses successfully.
Is my data uploaded anywhere?
No. All parsing, formatting, and minifying happen 100% locally in your browser — your JSON is never sent to a server.
What's the difference between formatting and minifying?
Formatting (prettifying) adds indentation and line breaks so JSON is easy to read. Minifying strips all unnecessary whitespace to produce the smallest possible file size — ideal for production use.
Does it cost money?
No. The JSON formatter is 100% free to use, with no registration or account required.