Is my JSON sent to a server?

No. Parsing happens entirely in your browser — your data never leaves the page.

What's the largest JSON I can format?

Roughly 10 MB before browser performance degrades. For bigger files, use a desktop tool like jq.

Can I format JSON with comments?

Standard JSON does not allow comments. If your JSON has // or /* */ comments, remove them first or use a JSONC-aware editor.

What's the difference between JSON and JSONC?

JSONC (JSON with Comments) is a superset used by VS Code config files. This tool handles standard JSON (RFC 8259). Strip comments before pasting.

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JSON Formatter & Validator

Format, validate, and minify JSON — with syntax error pinpointing.

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About this tool

Paste any JSON, get a beautified or minified version. Invalid JSON is highlighted with the exact line and column of the error. Works with files up to 10 MB.

How to use

1 Paste your JSON text into the input area.
2 Click Beautify for readable indented output, or Minify to strip whitespace.
3 If there's an error, the exact line and column will be highlighted.
4 Click Copy to copy the formatted JSON to your clipboard.

Frequently Asked Questions

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