JSON Formatter & Validator

Beautify, validate and minify JSON with clear error messages.

Sort keys

JSON input

Output

What does a JSON formatter do?

A JSON formatter pretty-prints and validates JSON so it is easy to read and debug. NMSnabbit re-indents JSON with 2 spaces, 4 spaces or tabs, minifies it to a single line, and shows a clear error message when the JSON is invalid. Parsing happens entirely in your browser, so even sensitive payloads stay private.

How to use the JSON Formatter

1 Paste your JSON into the input box.
2 Click Format to pretty-print it, or Minify to compress it to one line.
3 If the JSON is invalid, a clear error message tells you what went wrong.
4 Copy the formatted or minified output.

What you can use it for

Debugging API responses.
Cleaning up minified configuration files.
Validating JSON before pasting it into code.
Shrinking JSON payloads for production.

Frequently asked questions

Does this validate JSON?

Yes. If your input is not valid JSON, the tool shows the parser error message so you can find the problem quickly.

Can it minify as well as beautify?

Yes. Format pretty-prints with your chosen indentation; Minify removes all unnecessary whitespace to produce the smallest valid JSON.

Is my JSON uploaded?

No. Parsing and formatting happen entirely in your browser, so even sensitive payloads never leave your device.

What indentation can I use?

You can format with 2 spaces, 4 spaces or tabs to match your project style.

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JSON Formatter & Validator

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Frequently asked questions

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