30, 2020. The skills are ranked from No. 15 to No. 1 based on the demand for each, according to Upwork. No. 15: React A React developer uses the open-source React JavaScript (JS) library to build ...

Among the JavaScript skills ... jQuery has fallen 30% since 2015, while Ajax is down even more -- 54%. Backbone.js has also seen its appearance in job postings drop significantly since 2014 ...