Question 1

How do I format JSON with this tool?

Accepted Answer

Paste your JSON into the input box and the tool parses it and shows the formatted result. You can switch between a pretty-printed indented view and a minified single-line version.

Question 2

What is the difference between formatting and minifying?

Accepted Answer

Formatting adds indentation and line breaks so the JSON is easy to read, while minifying removes all unnecessary whitespace to produce the smallest single-line output. Use formatting for editing and debugging, and minifying when you want compact JSON for transport or storage.

Question 3

Why does it show an error instead of fixing my invalid JSON?

Accepted Answer

The tool validates JSON using the browser parser and shows that parser's error message so you can locate the problem, such as a trailing comma or a missing quote. It does not automatically repair invalid JSON, so you need to correct the input yourself before it can be formatted.

Question 4

Is it free and does it work offline?

Accepted Answer

Yes, the tool is completely free with no account required. Because all parsing happens in your browser, it keeps working even after the page has loaded and you go offline.

Question 5

Is my JSON uploaded to a server?

Accepted Answer

No, your JSON is never uploaded. All formatting, minifying, and validation run locally in your browser, so the text you paste stays on your device and is not sent anywhere or tracked.

JSON Formatter

FAQ