NODE_ENV variable in Node.js

Question

I am a beginner in Node and I see the following code in my project:

process.env.NODE_ENV

What is NODE_ENV and how can I get access to it or change it? It seems to pick up some values but don't know from where is it getting picked up.

Please let me know.

Answer 1

NODE_ENV是环境变量的名称，您可以在shell中访问和更改它，例如： export NODE_ENV=development ，可以在运行进程时进行更改，例如： NODE_ENV=production node application.js ，也可以对其进行更改在您的Shell的配置文件之一中 。