JSON Formatter
Validate and pretty-print JSON, or minify it. Parsing errors are reported with a message. The data never leaves your browser.
- Runs entirely in your browser
- No sign-up, no watermark
- Free and unlimited
🔒 Your file stays on your device
How to use JSON Formatter
- 1
Open JSON Formatter and paste or type your text into the input box.
- 2
Adjust any options to match what you need.
- 3
The result updates instantly below — copy it with one click.
What you get
- Indent 2 / 4 or minify
- Reports parse errors
- Runs entirely in the browser
What happens to your files
This tool runs entirely in your browser. The file you choose is read into memory, processed on your device, and offered back as a download. Nothing is uploaded and nothing is kept once you leave the page.
There is no account, no email, no watermark and no daily limit. Come back whenever you need it.
Frequently asked questions
- Is my JSON sent to a server?
- No. Parsing and formatting use your browser's built-in JSON engine. Nothing is transmitted.