Express Gateway is an API Gateway built on Express.js. It has the advantage of being simple and minimalist but also flexible and highly extensible thanks to JavaScript plugins. Let's give it a try.
First of all, if you don't already have a recent version of NodeJS installed, please grab the latest one here https://nodejs.org/en/download/current/.
Now, you can install Express Gateway using npm.
npm
npm install -g express-gateway