How to use Format JSON Online
- Type or paste your JSON into Format JSON Online's input area.
- Set Indent so the output fits your use case.
- Press Format and Format JSON Online shows the result straight away.
- When it looks right, Copy to save it.
About this tool
Format JSON Online is a static, client-side tool with no backend. Format JSON Online validates and reshapes your JSON locally with no server round-trip.
Because parsing is local, sensitive payloads never leave the page. Nothing you enter is uploaded, and it keeps working offline once the page has loaded.
Frequently asked questions
What is Format JSON Online for?
Use Format JSON Online to format your input without installing anything using the Indent control; everything happens client-side.
Do I need an account for Format JSON Online?
No — Format JSON Online needs no account, sign-up or installation.
Where is my data processed by Format JSON Online?
Entirely in your browser — Format JSON Online keeps your data on your own machine and sends nothing anywhere.
Can Format JSON Online handle large or deeply nested JSON?
Yes. Format JSON Online parses JSON entirely in your browser, so large or nested documents stay on your device and never upload.
Does Format JSON Online work on mobile?
Yes — Format JSON Online is just a web page and runs on any modern browser, including phones and tablets.