Unable to get a system env variable inside react

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9 Answers

systemvariableinsideunablereact
90%

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Try this...

const result = require('dotenv').config({
   path: '/full/custom/path/to/your/env/vars'
})

if (result.error) {
   throw result.error
}
88%

Now we have the environment variable REACT_APP_API_URL when in development, and we have the API_URL when serving the built package. We need to differentiate the two in our frontend code. Lucky for us, there is a variable that lets us know which environment we’re in: process.env.NODE_ENV :,This says “If we’re in development, use REACT_APP_API_URL, otherwise us window.API_URL”. And that’s it!,First, let’s add the variable in the development environment so it’s availble when we run npm start. This doesn’t change one bit, we’re just going to add it in the .env file:

REACT_APP_MY_ENV = Some value
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72%

Accessing environment variables in Node.js is a straight-forward process: We set the environment variable and we access it on Node’s process.env object. In React.js, APIs and secrets that need to be accessed (maybe in a fetch) are best hidden from the app code.

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65%

Your project can consume variables declared in your environment as if they were declared locally in your JS files. By default you will have NODE_ENV defined for you, and any other environment variables starting with REACT_APP_.,To define permanent environment variables, create a file called .env in the root of your project:,Environment variables are embedded into the build, meaning anyone can view them by inspecting your app's files.

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75%

In Unix systems, we need to pass the env vars before passing the (or other) commands \,Defining environment variables can vary between OSes. It’s also important to know that this is temporary for the life of the shell session.,It's important to note that NX will only include in the process:

NODE_ENV = development nx build myapp
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40%

To add environment variables to the JavaScript bundle, open next.config.js and add the env config:,Since the release of Next.js 9.4 we now have a more intuitive and ergonomic experience for adding environment variables. Give it a try!

To add environment variables to the JavaScript bundle, open next.config.js and add the env config:

module.exports = {
   env: {
      customKey: 'my-value',
   },
}
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.css - vem1e6 {
   color: var (--expo - theme - text -
      default);font - family: expo - brand - mono,
   Monaco,
   Consolas,
   'Liberation Mono',
   'Courier New',
   monospace,
   'Apple Color Emoji',
   'Segoe UI Emoji',
   'Segoe UI Symbol',
   'Noto Color Emoji';font - size: 13 px;line - height: 20 px;white - space: inherit;padding: 0 px;margin: 0 px;
}.css - vem1e6.code - annotation {
   -webkit - transition: 200 ms ease all;
   transition: 200 ms ease all;
   transition - property: text - shadow, opacity;
   text - shadow: var (--expo - theme - highlight - emphasis) 0 px 0 px 10 px,
      var (--expo - theme - highlight - emphasis) 0 px 0 px 10 px,
      var (--expo - theme - highlight - emphasis) 0 px 0 px 10 px,
      var (--expo - theme - highlight - emphasis) 0 px 0 px 10 px;
}.css - vem1e6.code - annotation: hover {
   cursor: pointer; - webkit - animation: none;animation: none;opacity: 0.8;
}.css - vem1e6.code - hidden {
   display: none;
}.css - vem1e6.code - placeholder {
   opacity: 0.5;
}
export default {
   name: 'CoolApp',
   version: '1.0.0',
   extra: {
      enableComments: process.env.COOLAPP_COMMENTS === 'true',
   },
};
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Have you ever run into a problem in production/staging, when you just wanted to change the API URL in your React app in a quick and easy way?,I believe that my new package, runtime-env-cra solves this problem in a quick and easy way. You won't need to build different images anymore, because you want to change only an environment variable.,We have come up with our solutions over the years here at RisingStack, but everyone had a different opinion about what is the best way to handle runtime environment variables in client apps. So I decided to give it a try with a package to unify this problem (at least for me:)).

Let's say you have a .env file in your root already with the following environment variables.

NODE_ENV = production
REACT_APP_API_URL = https: //api.my-awesome-website.com
   REACT_APP_MAIN_STYLE = dark
REACT_APP_WEBSITE_NAME = My awesome website
REACT_APP_DOMAIN = https: //my-awesome-website.com
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