Frontend Caching Done Right

In this article we’ll cover how the browser cache and HTTP headers work, when and how to use stale-while-revalidate, how service workers give you programmatic control over caching, what you should never cache, and how cache invalidation works in practice. All of it from the perspective of building for platforms that can’t afford to get this wrong. Caching is one of those topics that every frontend developer thinks they understand, until they’re staring at a production issue where users are getting stale data, or worse, the server is getting hammered because nothing is being cached at all. I’ve worked on platforms handling more than 10 million active users. And I can tell you, caching stops being a “nice to have” the moment your scale starts growing. It becomes the difference between a platform that feels fast and one that quietly falls apart under load. This article is everything I’ve learned about frontend caching, written the way I wish someone had explained it to me early in my care