Question

168

How can I check if an environment variable is set in Node.js?

rated 0 times [ 172] [ 4] / answers: 1 / hits: 78894 / 9 Years ago, tue, may 5, 2015, 12:00:00

I would like to check if an environment variable is set in my Express JS server and perform different operations depending on whether or not it is set.

I've tried this:

if(process.env.MYKEY !== 'undefined'){

    console.log('It is set!');

} else {

    console.log('No set!');

}

I'm testing without the process.env.MYKEY but the console prints It is set.

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everardo

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4 Years ago

answered 9 Years ago luna · Accepted Answer

This is working fine in my Node.js project:

if(process.env.MYKEY) { 

    console.log('It is set!'); 

}

else { 

    console.log('No set!'); 

}

EDIT:

Note that, As @Salketer mentioned, depends on the needs, falsy value will be considered as false in snippet above. In case a falsy value is considered as valid value. Use hasOwnProperty or checking the value once again inside the block.

> x = {a: ''}

{ a: '' }

> x.hasOwnProperty('a')

true

Or, feel free to use the in operator

if (MYKEY in process.env) {

    console.log('It is set!');

} else {

    console.log('No set!');

}