zero_api Host node js,express app in vercel with minimal configuration vercel is different from heroku Zero API is built with almost no base except js,NODEjs and express. Your existing nodejs,express app can be modified to seamlessly work in Vercel ZERO API File Location Purpose package.json package.json contains all packages,build script for the NODEjs,express app vercel.json vercel.json contains versions,build and root so that a normal NODEjs,express app can work in VERCEL index.js src/index.js index js file that is the base for any NODEjs,express app