Tag

#JavaScript

6 posts

01May 24, 2026Your Site Looks Fine — Until It Loads on a PhoneMost slow sites aren't badly built — they just do too much work to load. This guide walks the critical rendering path step by step, then fixes the four things Lighthouse always flags: CSS, images, JavaScript, and fonts. Includes the delivery layer (CDN, HTTP/3, Brotli, caching) and how to stop performance from eroding after you fix it.
02April 16, 2026CORS Isn't Blocking You — Your Browser Is. Here's What's Actually HappeningMost developers treat CORS errors as a server configuration mystery. They're not. Your server responded fine — your browser intercepted the response. This post covers the CSRF attack CORS was built to prevent, how origin is actually defined, why Postman never sees CORS errors, how preflight requests work, and what every response header actually means.
03April 1, 2026The Axios npm Supply Chain Attack, ExplainedOn March 31, 2026, two malicious versions of Axios — axios@1.14.1 and axios@0.30.4 — were discovered containing a precision-engineered, self-erasing supply chain attack. The RAT it dropped could silently steal your AWS credentials, API keys, and more — and npm audit reported a clean bill of health the entire time. Here's exactly how it worked.
04September 2, 2025SharedWorker: The Hidden API for Multi-Tab Real-Time AppsSharedWorker is a lesser-known browser API that enables multiple tabs, windows, or iframes of the same origin to share a single background worker. This post dives into use cases, performance benefits, comparisons with other workers, implementation details, and browser support.
05August 20, 2025Deep Dive: V8's JSON.stringify Optimizations and Deterministic OutputJavaScript's JSON.stringify is fundamental for web developers, and V8 has dramatically improved its performance with new optimizations. This deep dive explores the traditional implementation bottlenecks, V8's new insertion-order-based serialization with fast-path optimizations, and provides practical guidance for leveraging these improvements at scale.
06April 21, 2024A comprehensive guide for beginner frontend developers: javascript editionMaster JavaScript and Frontend Development with a Structured Learning Path and Essential Resources

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