In Node JS there is a __dirname constant. Can I define my own constants

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Editorial Team

Asked: June 18, 20262026-06-18T10:08:01+00:00 2026-06-18T10:08:01+00:00

In Node JS there is a __dirname constant.

Can I define my own constants in the same form?

eg:

__root

or

__myCrazyConstant

Thanks!

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Editorial Team · Answer 1 · 2026-06-18T10:08:02+00:00

Editorial Team

You can make a variable with any name you want, no matter how many underscores it contains.

You can create a constant with the const keyword:

const myContsant = 42;
myConstant = 0;
console.log(myConstant); // 42

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