How to use it
- Choose or drop your files, or enter the content to encode.
- Set the available output options and start processing.
- Preview, copy or download the result directly to your device.
Developer
JSON Formatter
Format, minify and validate JSON locally.
—✓ Your data stays on your device✓ Free · no sign-up✓ Runs locally
Method
The browser encodes or decodes the supplied value locally using the selected standard.
Worked example
Format, minify and validate JSON locally.
Reference: developer.mozilla.org · Last reviewed: 2026-07-23
Supported formats
Browser input and output
Private by design
Your data stays on your device. No account is required.
Frequently asked questions
Are my files uploaded — JSON Formatter?
No. Processing runs locally in your browser and the input is not sent to our server.
Is this tool free — JSON Formatter?
Yes. The core tool is free and does not require an account.
What happens if my file is too large — JSON Formatter?
The tool stops before processing and shows the applicable safety limit. Split the batch or use a smaller file.