How can I intercept CTRL+V keypress and then alert what was pasted using JavaScript or jQuery?

I want to do the following:
User presses CTRL V while focused on the webpage
Page intercepts it and shows an alert with what the user has tried to paste

For example:
User has “foo” in clipboard
User presses CTRL V while focused on the webpage
Page shows an alert with “foo” in it

I am new to JavaScript, and I am not sure how can I implement this.
Any help will be appreciated. Thanks!