Because JS has no standard library and was originally a very light scripting language designed in a few days and used for browser coding. It has evolved very r

Because JS has no standard library and was originally a very light scripting language designed in a few days and used for browser coding. It has evolved very rapidly as the web grew and these frameworks are a natural outcome of everyone trying to create some order from the chaos and figure out a proper architecture and way to do things. The good news is you have lots of choices and it runs everywhere. Bad news is the sprawling mess you have to go through to find the good stuff.