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View and format JSON files

Explore JSON as a collapsible tree or pretty-printed text. Invalid JSON points to the exact line and column of the problem.

Drop a JSON file to open it

JSON and 93+ other formats

Opens on your device. Nothing is uploaded.

What you’ll see

  • Collapsible tree view
  • Pretty-printed text view
  • Exact error position
  • JSON Lines support
  • Search

How to open a JSON file

  1. Choose your file

    Tap “Choose a file” above, or drag your .json file anywhere onto this page.

  2. Read it instantly

    DocuFun opens it on your device in a second or two. Nothing is uploaded.

  3. Print, save or share

    Use Print to make a PDF, search inside the document, or download the original again.

Never uploaded

Your file is opened by code running in this page. It never travels to a server — not ours, not anyone’s.

Works offline

After your first visit DocuFun keeps working with no connection. Try it in airplane mode.

No sign-up

No account, no email, no cookies, no tracking. Open a file and read it. That’s it.

JSON questions

Is my JSON sent to a server to be formatted?

No. It is parsed by your browser, on your device.

Is it safe to open private documents here?

Yes. The file is read by code in this page and never leaves your device. DocuFun has no server that could receive it.

Open other files

From the makers of DocuFun

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