Free JSON Formatter & Validator

This is a free, private JSON formatter that runs entirely in your browser. Paste any JSON — an API response, a config file, a Shopify order payload, a webhook body — and get it pretty-printed with 2-space, 4-space, or tab indentation, or minified to a single line. It validates as you type and shows you node count, nesting depth, and how many bytes minifying saves. Nothing is uploaded to a server, so it is safe for sensitive data, and it keeps working with no internet connection.

How to use json formatter

1. Paste or type your JSON into the input box.
2. If it is valid, you'll see live stats (nodes, max depth, minified size) and the formatted output below.
3. Pick an indent size (2 spaces, 4 spaces, or tab) for pretty-printing.
4. Click 'Copy pretty' for the formatted version or 'Copy minified' for the compact one.
5. If the JSON is invalid, the exact parser error and position are shown so you can fix it.

Common uses

• Reading a minified API response during debugging
• Cleaning up a config file (package.json, tsconfig, theme settings) before committing
• Inspecting a Shopify webhook or order payload without pasting it into an online service
• Minifying a JSON blob to embed in a data attribute or Liquid template
• Checking that a hand-edited JSON file still parses

Frequently asked questions

Is this JSON formatter really free?

Yes. It is completely free with no account, no usage limits for basic formatting, and no ads. It is provided as a utility by Faraz Hussain.

Is my JSON data sent anywhere?

No. All parsing and formatting happens locally in your browser using the built-in JSON engine. Your data never leaves your device and there is no server involved.

Does it work offline?

Yes. Once the page has loaded, you can disconnect from the internet and the formatter still works.

What is the difference between formatting and minifying JSON?

Formatting (pretty-printing) adds indentation and line breaks so JSON is easy for humans to read. Minifying removes all optional whitespace to make the file as small as possible for transmission or storage.

Why does it say my JSON is invalid?

Common causes are trailing commas, single quotes instead of double quotes, unquoted keys, or comments — none of which are allowed in strict JSON. The tool shows the exact error message and character position.

This free tool is one of several browser-based AI utilities by Faraz Hussain, a Shopify developer and web engineer. See all free AI tools, what he's shipped, or the services.

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