Cucumber is a tool for running automated tests written in plain language. Because they're written in plain language, they can be read by anyone on your team. Because they can be read by anyone, you can use them to help improve communication, collaboration and trust on your team. 

Cucumber.js is the JavaScript implementation of Cucumber and runs on both Node.js (4 and above) and modern web browsers.[Cucumber.js是Cucumber的JavaScript实现，可以在Node.js（4及更高版本）和现代 Web浏览器上运行]   

Cucumber安装

npm install cucumber