The Express Problem Express was built in 2010. No built-in validation. No TypeScript support. No schema documentation. And it's slow — 15K requests/sec vs. Fastify's 60K+. Fastify is Express's modern replacement. JSON Schema validation, plugin architecture, TypeScript-first, 3x faster. What Fastify Gives You Simple API import Fastify from ' fastify ' ; const app = Fastify ({ logger : true }); app . get ( ' / ' , async () => { return { hello : ' world ' }; }); app . listen ({ port : 3000 }); Enter fullscreen mode Exit fullscreen mode JSON Schema Validation (+ Auto Documentation) app .…