In-depth articles, tutorials, and guides on Networking & Caching — covering everything from fundamentals to advanced patterns.
Not all performance wins come from the same layer. Caches, CDNs, and database indexes all speed up reads, but they solve different bottlenecks and create different failure modes around staleness, invalidation, and query cost.
Service Workers have a complex lifecycle that frequently catches developers off guard. Understanding the installing, waiting, and activating phases — and why a new service worker can sit idle for days waiting to take over — is essential for shipping updates that actually reach users.
Caching makes applications fast. Cache invalidation makes them correct. The challenge is not storing data — it is knowing when stored data is no longer fresh and deciding what to do about it. Every caching strategy is a trade-off between freshness, performance, and complexity.
Web Workers and Service Workers both run JavaScript off the main thread, but they serve fundamentally different purposes. Understanding when to reach for each one — and when not to — is key to building performant, reliable web applications.
CORS errors are among the most common frustrations in web development. Understanding why preflight requests exist and how the browser decides to send them will save you hours of debugging.
Every fetch request you fire without a cancellation mechanism is a potential source of race conditions, memory leaks, and stale state. AbortController is the standard browser API that solves this — and it is simpler than most developers realise.
Axios is a powerful HTTP client for JavaScript that allows you to easily interact with APIs. One of its most useful features is interceptors, which let you run custom code before a request is sent or after a response is received. This guide will walk you through everything you need to know about Axios interceptors, including their types and several practical use cases.