JSON Formatter

Beautify, minify, validate JSON with clear error messages.

Indent

Input JSON

Valid JSON.

Formatted Output

How it works

Paste or type your JSON.
Beautify to indent it, or minify to strip whitespace.
Validation runs as you type, pointing to the exact error location.
Copy the formatted or minified result.

What people use it for

Making a minified API response readable.
Finding the syntax error in JSON that won't parse.
Minifying JSON before embedding it somewhere size-sensitive.

Good to know

It works with standard JSON; JSON5, comments, and trailing commas are not valid JSON and will be flagged.
Files selected with the upload button are limited to 5 MB. Pasted text is processed locally and is bounded by your browser and device memory.

Frequently asked questions

Where is the error in my JSON?

Validation reports the specific location and reason (like an unexpected token or missing comma), so you can jump straight to the problem instead of scanning the whole document.

Can it handle big files?

The file picker accepts JSON files up to 5 MB. Pasted JSON has no separate upload limit, but practical browser and device memory limits still apply.

Is my JSON uploaded?

No. Formatting and validation happen entirely in your browser, which matters when the JSON contains sensitive data.

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