What is a JSON viewer?

A JSON viewer displays structured JSON in a readable format, often with a collapsible tree, search and validation.

How do I format JSON online?

Paste your JSON into Tool Kumar. The formatter creates an indented view, while the validator reports syntax errors.

Is this JSON viewer private?

Yes. Parsing and formatting happen in your browser, so your document does not need to leave your device.

Can I validate a large JSON file?

Yes. The viewer is designed for large documents and keeps the input local while it parses the file.

About Tool Kumar

How the JSON viewer handles your data

The editor parses and formats documents in your browser. It does not need an account, and the JSON you paste or open is not sent to a Tool Kumar server for processing. Recent work can be restored from this browser when you return to the app.

The viewer also supports offline use after the app has loaded. You can inspect large documents, search values, compare files and export results without moving the source JSON to another service.

What we publish

The Tool Kumar blog explains practical JSON and developer workflow topics. Each guide links to the tool so you can test the examples yourself. The JSON viewer remains free to use.

Start with JSON

Open the JSON viewer or read how to format and validate JSON before you begin.