TLDR - Take existing Express.js apps and host them easily onto cheap, auto-scaling, serverless infrastructure on AWS Lambda and AWS HTTP API with Serverless Express. It's packed loads of production-ready features, like custom domains, SSL certificates, canary deployments, and costs ~$0.000003 per request.
Serverless Expess is a pure Express.js experience and it's perfect for those that want to focus on apps, not infrastructure complexity.