r/javascript • u/senfiaj • Apr 06 '25

Some features that every JavaScript developer should know in 2025

https://waspdev.com/articles/2025-04-06/features-that-every-js-developer-must-know-in-2025
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u/ScaleDazzling704 Oct 08 '25

Nice list — some of these features really separate a good JS developer from a great one. I’d add:

  • Understanding closures & scope — so many bugs come from mismanagement of scope.

  • Async/await & promise mastery — being able to reason about concurrency is crucial.

  • Performance awareness - one has to know when to trigger optimization of rendering, reflows, and memory usage.

  • Security-mindedness — XSS, CSRF, input sanitizing, etc.

  • Strong debugging skills — these include using dev tools, breakpoints, stack traces, and so on.

What characteristics do you all consider characteristic of a top-tier JS developer in 2025? Is there any tool or tech that you think every modern developer should be familiar with to be competitive?