What does JSON formatting do?

Formatting (or beautifying) adds consistent indentation and line breaks to make JSON human-readable. It does not change the data — only the visual layout.

Minifying removes all unnecessary whitespace, line breaks, and indentation from JSON. This reduces file size, which is useful for API responses, configuration files, and network payloads.

Yes. All formatting happens in your browser using JavaScript. Your JSON is never sent to any server.

Why am I getting 'Invalid JSON'?

Common causes include trailing commas after the last item, single quotes instead of double quotes, unquoted property names, and missing brackets or braces. JSON is stricter than JavaScript object syntax.

Can I format JSON from an API response?

Yes. Copy the raw JSON response from your browser's developer tools or API client and paste it here to format it instantly.

Developer Tools

JSON Formatter

Validate, format, and minify JSON directly in the browser with no file upload and no external processing required, including fullscreen editing for long responses and config files.

Indent size

JSON input / output

4 lines • 44 chars

Paste JSON, beautify it in place, minify it for transport, or validate it before copying the final output.

Quick examples

Ready to validate and format JSON.