100% in your browser · files never leave your device

JSON Viewer & Formatter — Free & Private (In-Browser)

Paste or upload JSON to format, validate, and browse it as a collapsible tree. Runs 100% in your browser — your data is never uploaded.

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All free, all private — everything runs in your browser.

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How to use JSON Viewer

  1. 1Paste JSON into the input, or upload a .json file.
  2. 2Invalid JSON shows a clear error with the parser message.
  3. 3Browse it as a collapsible tree or as formatted text; pick indent.
  4. 4Copy minified/beautified JSON or download the formatted file.

JSON Viewer FAQ

Is my JSON uploaded anywhere?
No. Parsing and formatting happen locally in your browser. Sensitive data never leaves your device.
Will it tell me if my JSON is invalid?
Yes. The viewer reports the exact error message and position from the parser so you can fix it.