JSON Formatter
Format, validate, and beautify JSON data
What is JSON formatting?
JSON Formatter instantly beautifies and validates JSON data. Paste minified JSON and it will be reformatted with proper indentation, making it easy to read and debug. It also highlights syntax errors so you can fix malformed JSON quickly.
The formatter runs entirely in your browser — your data is never sent anywhere. It supports standard JSON as well as common extensions like trailing commas and JavaScript-style comments (JSON5). Output can be minified for production use or beautified for readability.
How to use JSON Formatter
Paste or type your JSON
Paste your JSON data into the input area on the left. It can be minified, beautified, or partially broken.
View the formatted output
The formatted, validated JSON appears on the right in real time. Syntax errors are highlighted with their line and column.
Copy or download
Click Copy to copy the formatted JSON to your clipboard, or Download to save it as a .json file.
Frequently asked questions
Does the JSON formatter validate my JSON?
Yes. The formatter checks your JSON against the JSON specification and shows an error message with the exact line and column if your input is invalid.
Can it handle very large JSON files?
Yes, the formatter works with large JSON files. Very large files (several MB) may take a moment to format, but there is no strict file size limit.
Does my JSON data get sent to a server?
No. All formatting and validation happens in your browser. Your data is never transmitted over the network.
Can I use it to minify JSON?
Yes. Click the Minify button to collapse the JSON into a single line with all unnecessary whitespace removed — useful for reducing payload size in APIs.