JSON Formatter
Paste your JSON and format it into readable, indented text, or minify it down to a single line — with instant validation for syntax errors.
Your files are processed locally in your browser. They are not uploaded to our servers.
How to use
- Paste your JSON into the box.
- Click Format to pretty-print it, or Minify to compress it to one line.
- Click Copy to copy the result.
What is this tool?
JSON Formatter parses the JSON you paste and either pretty-prints it with clear indentation or minifies it to a single compact line, entirely in your browser. If the JSON is invalid, it tells you immediately instead of silently failing.
Common uses
- Making an API response readable for debugging
- Validating JSON before using it in code or a config file
- Minifying JSON to reduce payload size
- Cleaning up JSON pasted from logs or documentation
Related tools
FAQ
Is my JSON uploaded anywhere?
No. Formatting and validation happen entirely in your browser — your data is never sent to a server.
What happens if my JSON has a syntax error?
You'll see a clear message telling you the JSON isn't valid, so you can check for missing quotes, commas or brackets.
Can I format very large JSON files?
Yes, though very large documents may take a moment longer to process depending on your browser.