Read environment variables in Node.js

Is there a way to read environment variables in Node.js code?

Like for example Python's os.environ['HOME'].

Answers:

Answer
process.env.ENV_VARIABLE

Where ENV_VARIABLE is the name of the variable you wish to access.

See Node.js docs for process.env.

Answer

When using Node.js, you can retrieve environment variables by key from the process.env object:

for example

var mode   = process.env.NODE_ENV;
var apiKey = process.env.apiKey; // '42348901293989849243'

Here is the answer that will explain setting environment variables in node.js

Answer

If you want to use a string key generated in your Node.js program, say, var v = 'HOME', you can use process.env[v].

Otherwise, process.env.VARNAME has to be hardcoded in your program.

Answer

To retrieve environment variables in Node.JS you can use process.env.VARIABLE_NAME, but don't forget that assigning a property on process.env will implicitly convert the value to a string.

Avoid Boolean Logic

Even if your .env file defines a variable like SHOULD_SEND=false or SHOULD_SEND=0, the values will be converted to strings (“false” and “0” respectively) and not interpreted as booleans.

if (process.env.SHOULD_SEND) {
 mailer.send();
} else {
  console.log("this won't be reached with values like false and 0");
}

Instead, you should make explicit checks. I’ve found depending on the environment name goes a long way.

 db.connect({
  debug: process.env.NODE_ENV === 'development'
 });
Answer

You can use env package to manage your environment variables per project:

  • Create a .env file under the project directory and put all of your variables there.
  • Add this line in the top of your application entry file:
    require('dotenv').config();

Done. Now you can access your environment variables with process.env.ENV_NAME.

Answer

Why not use them in the Users directory in the .bash_profile file, so you don't have to push any files with your variables to production?

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