Question 200850 in Javascript Question posted in
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Javascript – dotenv not reading variables inside .env file

I’m trying to use dotenv to load the following .env file:

PORT=4000
BASE_URL=http://127.0.0.1:${PORT}/

require('dotenv').config('.env')

For some reasons, dotenv does not resolve ${PORT} to 4000, instead it just returns a plain string like this:

{
  parsed: {
    PORT: '4000',
    BASE_URL: 'http://127.0.0.1:$PORT/',
  }
}

How can I make dotenv read variables inside .env file?

Tags:

2

Answers


  1. 0

    You can use dotenv-expand because dotenv doesn’t support variable substitution using ${} syntax.

    to use dotenv-expand install

    npm install dotenv-expand

    add require dotenvExpand keep the same .env file with ${} syntax

    var dotenv = require("dotenv");
var dotenvExpand = require("dotenv-expand");

var result = dotenv.config();
dotenvExpand.expand(result);

console.log(result.parsed);

    The output will return like:

    {
  PORT: '4000',
  BASE_URL: 'http://127.0.0.1:4000/'
}

    Output:

    output of env substitution

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  2. 0

    try to access to your variable with process.env
    for exemple process.env.PORT

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