JSON Formatter

Format, validate, and minify JSON

How to use

1. Paste your JSON (minified or messy) into the input box.
2. The tool instantly validates it and pretty-prints it with proper indentation.
3. If there's a syntax error, the message points you to what's wrong.
4. Copy the formatted JSON, or minify it back to one line.

Why use this tool

• Format & validate: Beautify JSON with consistent indentation and catch syntax errors as you type.
• Minify too: Collapse JSON back to a single line to shrink payloads for production.
• 100% private: Everything runs in your browser. Your data is never uploaded to a server, so it's safe for confidential content.
• Handles big files: Formats large JSON documents instantly without sending them anywhere.

Frequently asked questions

Is my JSON uploaded anywhere?

No. Formatting and validation happen entirely in your browser, so even sensitive API payloads stay on your device.

Why does it say my JSON is invalid?

Common causes are trailing commas, single quotes instead of double quotes, or missing brackets. The error message shows where parsing failed.

Can it minify JSON as well as beautify it?

Yes — you can pretty-print for readability or minify to a single line to reduce size.

Does it change my data?

No. Formatting only adjusts whitespace and indentation; the keys, values, and structure are untouched.

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