Run npm script with environment variable from package.json

Question

I am using a specific task runner to execute my node scripts called Yoshi. I want to run a script from package.json, for example, yoshi test but with a custom environment variable (for example special_variable):

"scripts": {
    "start": "yoshi start", 
    "test":  "special_variable=value yoshi test // this case"
}

Possible duplicate of How to set Environment variables from within package.json [Node.js] — RobC
– RobC, Commented Jun 26, 2018 at 9:28
They are explicitly speaking about the NODE_ENV variable and not a custom one... — Technotronic
– Technotronic, Commented Jun 26, 2018 at 11:39
The solution in the linked answer equally applies to custom variables too. E.g. FOO=bar - I fail to see what makes your variable any more special than NODE_ENV? If you're using a Bash shell you can check this by using printenv in an npm-script. For instance: "list-env-vars" : "FOO=bar printenv", then run npm run list-env-vars and you'll see FOO=bar listed as an env variable. — RobC
– RobC, Commented Jun 26, 2018 at 12:50
Weird, I tried it before and it didn't work, but now, looks like you are right. I'm closing this one. — Technotronic
– Technotronic, Commented Jun 27, 2018 at 10:31

RobC · Accepted Answer · 2019-02-12 13:22:34Z

3

Apparently, I can pass an environment variable using the ENV prefix in my npm-script like this:

"scripts": {
    "start": "yoshi start", 
    "test":  "ENV special_variable=value yoshi test"
}

edited Feb 12, 2019 at 13:22

RobC

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answered Jun 24, 2018 at 16:24

Technotronic

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Aliaksandr Sushkevich · Accepted Answer · 2018-06-24 16:42:45Z

2

I think you can create .env file and add your variables there.

answered Jun 24, 2018 at 16:42

Aliaksandr Sushkevich

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