Verify if checkbox is checked with JavaScript

In this video you will learn how to check if a checkbox is checked with #JavaScript
That is, verify if the input of type checkbox is marked

[albertt]

Thanks a lot for this video, Matt! I am searching how to do this for 2.5 hours and watched a couple of videos but yours is the one which worked for me.

[robloxaalexx]

This saved me, Matt. Just started coding JS and I was hardstuck with this issue. After a lot of research you had the best solution. Thanks!

[lailaabdulrahman]

Thanks alot it is very useful 👍 it help me alot

[unnamed]

Somebody knows why it gives me null? and the error "cant read properties of null" (reading "checked")