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

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To check if an environment variable is set in Node.js, we use the in operator.

For instance, we write

if ("DEBUG" in process.env) {
  console.log(process.env.DEBUG);
} else {
  console.log("Env var IS NOT SET");
}

to check if the DEBUG property is in process.env with "DEBUG" in process.env to check if the DEBUG environment variable is set.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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