Pass multiple variables to a package.json script is possible by utilizing the npm run command and

Within my package.json file, I have the following section (NOT BASH, NOT SH, NOT ZSHELL, NOT FISH).

Now that we've established this is indeed my package.json file, let me showcase its contents:

package.json

"scripts": {
"dev": "NODE_ENV=myValue myProgram"
}

I am looking to add additional variables (e.g. MYVAR=myOtherValue) to the above file, which, as mentioned before, is my package.json file. How can I achieve this (adding more variables to my package.json file)?

To clarify, I am not inclined to refer to the manpage of bash, zshell, fish, or sh. This is precisely why I am posing the question here instead of consulting the manpage - if that were the case, I wouldn't be seeking answers here and would resort to reading the manual. Your understanding is greatly appreciated.

node.jsnpmenvironment-variablesnpm-scripts

Answer №1

Ensure your script includes the following:

"dev": "NODE_ENV=myValue MYVAR=myOtherValue myProgram"

You have the ability to include multiple environment variables separated by spaces.

This concept is derived from the typical behavior in command line terminals such as bash, where you can define and access various environmental settings on the spot:

FOO1=baz FOO2=fnord FOO3=baz env | grep FOO
FOO1=baz
FOO2=fnord
FOO3=baz

Answer №2

I agree with Stevek on this topic. I found the answer provided frustrating due to its references to bash, considering that I am working on a Windows system using Powershell. My goal is to pass multiple environmental variables and ensure compatibility with Windows systems utilizing Powershell. Any mention of *nix commands only serves to confuse the issue unless it pertains to enabling cross-system functionality.

As this answer remains incomplete, I will share what I have discovered:

This resource explains how to pass a single variable: How to set environment variables from within package.json

 "start": "set NODE_ENV=YOURENV&&node start.js"

The question remains: how can multiple variables be passed? The search continues.

It has been suggested that using 'cross-env' is the preferred method: cross-env NODE_ENV=production my-command

Further details are available in this post: https://github.com/kentcdodds/cross-env/issues/15

"scripts": {
  "debug": "cross-env NODE_PATH=. DEBUG=app:* nodemon bootload.js"
}

However, it should be noted that 'cross-env' does not utilize PowerShell but instead leverages the deprecated cmd shell in Windows. This brings us back to the primary concern [unless modifications are made as outlined here: https://github.com/kentcdodds/cross-env/issues/192#issuecomment-513341729]

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