How to set environment variables from within package.json?

Question

How to set some environment variables from within package.json to be used with npm start like commands?

Here's what I currently have in my package.json:

{   ...   "scripts": {     "help": "tagove help",     "start": "tagove start"   }   ... } 

I want to set environment variables (like NODE_ENV) in the start script while still being able to start the app with just one command, npm start.

Answer 1

Set the environment variable in the script command:

... "scripts": {   "start": "node app.js",   "test": "NODE_ENV=test mocha --reporter spec" }, ... 

Then use process.env.NODE_ENV in your app.

Note: This is for Mac & Linux only. For Windows refer to the comments.