FreeRuns in your browser
JSON Formatter
Format, indent and inspect JSON with error reporting.
Options
Output
This tool runs entirely in your browser. Your data is never uploaded.
How it works
- 1
Enter or paste your data into the tool above.
- 2
The result is computed instantly inside your browser as you type.
- 3
Copy or download the result. Nothing is ever uploaded to our servers.
Questions
Is my JSON sent to your servers?
Never. All parsing and formatting happens inside your browser. That is deliberate — developer payloads frequently contain credentials or customer data.
Is my data safe?
Yes. This tool runs entirely inside your browser. Your data is never sent to a server, so nothing leaves your device.
Does it work offline?
Yes. Once the page has loaded, this tool keeps working offline thanks to the installable progressive web app.