JSer.info, the weekly JavaScript newsletter, marks its 15th anniversary. Since 2011, it has published 820 articles, introducing 13,606 sites and libraries. The data reveals a shift from quantity to quality, with article descriptions doubling in length. This anniversary reflects on how the JavaScript world has transformed over a decade and a half.

Information sources have evolved dramatically. Early years featured personal blogs like Hatena and conference slides. Today, official documentation from browser vendors and projects dominates. The newsletter's content shifted too: release notes now vastly outnumber tutorials and books, showing how primary sources have become the main channel for technical updates.

Technology trends are clear. jQuery was king in 2011, but React now leads UI frameworks. Build tools moved from webpack to Vite, and the runtime landscape diversified with Deno and Bun challenging Node.js. Meanwhile, technologies like CoffeeScript and Grunt have vanished from coverage, replaced by Rust-based tools and WebAssembly.