How do I format minified JSON?+
Paste your minified JSON into the editor and it formats automatically. If auto-format is off, click the 'Format' button.
Why does it say 'Invalid JSON'?+
Common causes: trailing commas (not valid in JSON), single quotes instead of double quotes, unescaped special characters, or missing closing brackets. The error message shows the line number to help you locate the issue.
Is there a size limit for the JSON I can paste?+
There is no enforced limit, but very large JSON files (over 10 MB) may slow down the browser's parser. For large files, consider a desktop JSON editor.
What is the difference between JSON and JSONC?+
JSONC is JSON with comments (like TypeScript's tsconfig.json). Standard JSON does not support comments. This tool validates standard JSON - remove comments before pasting JSONC.