JSON validation checks your code for syntax errors — missing commas, unclosed brackets, invalid characters, and more. Our free JSON validator pinpoints the exact line and column where the error occurs, saving you from manually scanning hundreds of lines.
The most common errors are: trailing commas (after the last item), missing quotes around keys, single quotes instead of double, and unescaped characters. Our validator catches all of these.
The validator shows where errors are, but you'll need to fix them in the input area. After fixing, click Validate again to confirm the fix.
Yes, our validate tool is completely free. No registration, no limits.
Yes, all tools including validate are fully responsive. Works on all devices.