找不到“ process.env.NODE_ENV”

Question

The variable process.env.NODE_ENV always bothers me every time I see it in a config file, especially webpack.config.js . Where can I find this? Because sometimes I want to change it's value to production instead of development .

Answer 1

You can set any environmental variable like NODE_ENV while running your applications.

Linux/Mac

NODE_ENV=production node myapp.js

Windows/Powershell

$env:NODE_ENV="production" ; node myapp.js

You can access environmental variable NODE_ENV inside your myapp.js by

process.env.NODE_ENV

Answer 2

process.env.NODE_ENV is Node.js environment.

With the help of this mostly we decide our deployment environment in which we are deploying the code.

It can be development , stag or production .

We can do other stuff on env , it's up to us.

to set in Linux

export NODE_ENV=production

on Windows

set NODE_ENV=production

Example

config.js

{development:{
//your `env` value
},
production:{
//Your `env` value
}}

Now on the basis of NODE_ENV your env will be set