Catch the JavaScript bugs before your users do.
Paste any JavaScript, however long. A whole HTML page works too, and only its script blocks are scanned. The scan lists every problem with the line it sits on and a fix you can copy, and one click can repair the safe ones for you.
or press Ctrl + Enter
Scan report
This is a static scan of the JavaScript you pasted. Treat each result as a lead to verify. Some findings can be false alarms, and code in other files or values only known at run time cannot be seen.