Express.js vs Koa: which is better for performance and middleware control?
The question is about Express.js .
Express.js wins on ecosystem size and maturity; Koa wins on middleware control and a lighter core. Express pulls roughly 125 million weekly npm downloads against about 7.8 million for Koa, a gap of more than 15 to 1. Koa exists because TJ Holowaychuk, one of Express's original creators, started building it in 2013 to strip out the router, view engine, and bundled middleware that Express ships with by default.
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