Free JSON Formatter & Validator

Pretty-print, minify, and validate JSON with clear error messages, right in your browser. Free, no sign-up.

Paste your JSON

Output

✓ 100% free✓ Runs in your browser✓ No sign-up

How it works

Three steps, no fuss.

Paste your JSON

Drop in raw or messy JSON from an API or file.

Format or minify

Pretty-print for readability, or minify for production.

Copy the result

Grab clean, validated JSON in one click.

FAQ

JSON formatter questions, answered.

What does this tool check?

It validates that your JSON is syntactically correct using the browser's built-in JSON parser, and shows a clear error message with what went wrong if it isn't.

Is my data sent to a server?

No. Formatting and validation happen entirely in your browser. Nothing is uploaded.

What's the difference between format and minify?

Format adds indentation and line breaks for readability. Minify strips all unnecessary whitespace for the smallest possible file size.

Is this free?

Yes, completely free with unlimited use.

Need a tool built just for you?

This free tool is a small taste of what we do. Go4Lead.tech builds custom software, web and mobile apps, and internal tools for businesses.

See our services → Start a project