What's the difference between JSON formatting and validation?

Formatting (pretty-printing) adds indentation and line breaks to make JSON readable. Validation checks that the syntax is correct — missing commas, unclosed brackets, etc. This tool does both at once.

Why is my JSON showing an error?

Common issues: trailing commas after the last item, single quotes instead of double quotes, unquoted property names, or comments (JSON doesn't support comments).

Can I minify JSON with this tool?

This tool formats (expands) JSON. To minify, use your browser's console: JSON.stringify(JSON.parse(yourJson)).

Is my JSON data sent to a server?

No. Formatting runs entirely in your browser.

JSON Formatter

Format, beautify and validate JSON online. Instantly pretty-print minified JSON with proper indentation.

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Formatted JSON

Frequently asked questions

JSON Formatter & Validator Online — Beautify JSON Free

Minified or malformed JSON is hard to read and debug. Paste your JSON into our formatter and it will be instantly pretty-printed with consistent indentation and syntax validation. If your JSON has errors, a clear message tells you exactly what's wrong.

Instant formatting

Paste minified or compact JSON and get a properly indented, human-readable result immediately.

Syntax validation

Invalid JSON shows a clear error message pinpointing the problem — missing comma, extra bracket, wrong quote type.

Private

Runs entirely in your browser. Your JSON data never leaves your machine.

Whether you're debugging an API response, reading a config file, or just trying to make sense of a blob of JSON — our formatter makes it readable in one click.