Deploying a Node.js App to Production: The Complete 2026 Guide From localhost to production users. Everything you need to know, nothing you don't. Before You Deploy: The Checklist // 1. Environment variables (not hardcoded!) const config = { port : process . env . PORT || 3000 , dbUrl : process . env . DATABASE_URL , jwtSecret : process . env . JWT_SECRET , }; // 2. Error handling in place process . on ( ' uncaughtException ' , ( err ) => { console . error ( ' Fatal: ' , err ); process . exit ( 1 ); }); // 3. Graceful shutdown const server = app . listen ( config . port ); function shutdown ( signal ) { console . log ( ` ${ signal } received` ); server . close (() => { console . log ( ' HTTP server closed ' ); db . close (). then (() => process . exit ( 0 )); }); setTimeout (() => process . exit ( 1 ), 10000 ); // Force exit after 10s } process . on ( ' SIGTERM ' , () => shutdown ( ' SIGTERM ' )); process .…