"TypeError" in JavaScript — What It Means and How to Fix It
What the JavaScript error "TypeError" means and how to fix it.
Published October 29, 2026
"TypeError" is thrown when a value is used in a way that's incompatible with its type.
Key points
- Check the browser console's stack trace to find exactly which line and call triggered the error
Example
null.toString() // TypeError: Cannot read properties of null