A lot of modern backend code looks roughly the same. Define a route. Write a handler. Validate input. Query data. Return a response. It works. But after building enough APIs, something starts to become obvious: Most of the code isn’t unique. It’s repetition wrapped in slightly different logic. The Traditional Route Handler Model Most applications are structured around handlers. Something like this: app . get ( " /posts/:id " , async ( req , res ) => { const id = req . params . id ; if ( ! id ) { return res . status ( 400 ). json ({ error : " Missing id " }); } const post = await db . posts . findById ( id ); if ( ! post ) { return res . status ( 404 ). json ({ error : " Post not found " }); } return res . json ( post ); }); Enter fullscreen mode Exit fullscreen mode There’s nothing inherently wrong with this.…