React is definitely worth learning . It is not just a fad. React itself is not what’s important, but rather the patterns that React has popularized in Web development. The principles of functional programming and unidirectional data flow have existed for decades, but are only now being widely adopted on the Web.
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If you have example applications using React and Express together yes ; very much so. Your skillset is the minimum for building a front end plus back end router to drive an API. You will of course need some sort of database in there somewhere.
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