📋 Developer Tools

JSON Formatter & Validator

Format, validate, and minify JSON instantly. Highlights errors, supports pretty-print and compact output. Free online JSON formatter — no sign-up.

Free to use No sign-up Works instantly

Input JSON

Output

Indent:

How to Use

Paste your JSON

Paste raw, minified, or malformed JSON into the input box.

Click Format

Hit Format to pretty-print with indentation, or Minify to compact it.

Copy the result

Copy the formatted output to clipboard with one click.

Frequently asked
questions

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write, and easy for machines to parse and generate.

What does "formatting" JSON mean?

Formatting (or "pretty-printing") adds indentation and line breaks to make JSON easier to read. Minifying removes all unnecessary whitespace to reduce file size.

Is my JSON data sent to a server?

No. All formatting and validation happens in your browser using JavaScript. Your data never leaves your device.

What are common JSON errors?

Common errors include: missing quotes around keys, trailing commas, using single quotes instead of double quotes, and unescaped special characters in strings.