Answers for "Uncaught TypeError: $.ajax is not a function"

ajax is not a function

// Make sure you are not using the slim version

Uncaught TypeError: $.ajax is not a function

Neither of the answers here helped me.
The problem was: I was using the slim build of jQuery, which had some things removed, ajax being one of them.

The solution: Just download the regular (compressed or not) version of jQuery and include it in your project.