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.
Paste any JSON string and click Validate. If it's valid, you'll see the type and key count. If there's an error, the tool shows the exact position with surrounding context and an arrow pointing to the problematic character.
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.