If you are using jQuery, Angualr JS or plain old JavaScript and getting "Uncaught ReferenceError: $ is not defined" error which means $ is either a variable or a method which you are trying to use before declaring it using var keyword. In jQuery, it's a short name of jQuery() function and most commonly used in $(document).ready(function()). If you are doing some jQuery stuff when DOM is loaded and getting this error it means your browser has a problem loading jQuery library either from the internet or local file system. In this article, you will see some of the most common reasons of "Uncaught ReferenceError: $ is not defined" error and how to solve them, but before that let's learn some basic about the dreaded Uncaught ReferenceError: $ is not defined error.
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