JSON Formatter
Paste any JSON to instantly beautify it and check for syntax errors. Runs entirely in your browser — nothing is sent to a server.
About the JSON Formatter
Minified or poorly formatted JSON is hard to read and debug. This tool instantly beautifies (pretty-prints) JSON with proper indentation and checks for syntax errors — all in your browser, with nothing sent to a server.
How to use it
1. Paste your JSON into the box.
2. The tool formats it with proper indentation and spacing.
3. If there's a syntax error, it will be flagged so you can fix it quickly.
Who uses a JSON formatter?
Developers debugging API responses, students learning data structures, and anyone working with configuration files or data exports uses a JSON formatter to quickly spot errors and make dense, minified JSON human-readable.
Frequently asked questions
Is my JSON data uploaded anywhere?
No. Formatting and validation happen entirely in your browser — nothing is sent to a server.
Can it detect invalid JSON?
Yes, the tool validates syntax and will indicate if your JSON contains errors.
Is there a size limit?
No hard limit — it can handle anything from small snippets to large JSON documents.