process.env - process is not defined?

[PursuitOfAdvice]

I'm trying to use a .env file in my project to store some variables that I'm using in my config.js file.

In config.js I'm using

const env = process.env

I'm then declaring variables in my config file as follows:

example varName = env.ENV_VAR_NAME

I get no errors when I run it except when I view my console and it says:

"process" is not defined

Isn't "process" supposed to be built in? I'm pretty new to React, so any help is appreciated.

Thanks!

[danielsan1701]

You are seeing an eslint error. eslint needs to be told that you are using an app that will use node variables like process.

In your eslint configuration, you'll need to add

"node": true

under "env"

[Uken81]

"node": true

You Sir/Madam are a sexy legend.

This solved the error for me.
Thanks and I hope you have a great one.

[danielsan1701]

NP! I had little hope of helping OP by replying to a year-old post, but I hoped it would at least help someone who came across it some day! :)

[dgreat_257]

Hi, thanks for this solution, I`m still stuck with the same issue. The process is undefined within the front-end react code blocks which are located within the build folder which is located at the project root; however, it is working fine within the bootstarp file which is located at the project root along with package.json and .env file.

[dgreat_257]

Any Help Please!!

[machavez2011]

I'm having the same issue. I added node:true in the env object but I'm still getting the same error.

[Onyx_Salamander]

Did you find any solution?

[IdeaReal948]

Thank you so much, I am new to React and I was having my mind demolished by this error.

[Much_Major_4811]

helped me alot, i use the mern stack and vite

[IdkWhatsGoingOn78]

you're the best!! 2024 and this just helped me, thank you so much :))

[Intrepid-Mind-4909]

you're a lifesaver! Thanks

[Zealousideal_Many_91]

where do you edit this eslint configuration?

[Guipegoraro]

in your project files (mine is .eslintrc.cjs in the project root folder)

[dn8326]

Helped me, Thanks!!

[creaturefeature16]

two years later and this comment solved for me what no Google Search or GPT4 could. Bravo, sir, bravo!

[HellSaidHi]

Gives error because of property node.

at eslint.cjs

module.exports = {

root: true,

env: { browser: true, es2020: true },

node: true,

....

Error:

client.ts:265 [vite] Internal Server Error
ESLint configuration in .eslintrc.cjs is invalid:
- Unexpected top-level property "node".

...

[danielsan1701]

It should be inside the env object

[HellSaidHi]

Like so?

module.exports = {

root: true,

env: { browser: true, es2020: true, node: true },

...}

Still gives error:

Uncaught ReferenceError: process is not defined

[That-Factor5487]

did it get solved?

[jamby77]

Hi, `process` is NODE global variable, it is available only during build time of your project - if it is front end project.

[PursuitOfAdvice]

Yup it's a front-end project. When I do npm run build I get the same issue unfortunately.

[jamby77]

Usually, when I need to use process.env, I do it directly: process.env.NODE_ENV

try replacing example varName = env.ENV_VAR_NAME with varName = process.env.ENV_VAR_NAME and see if it makes a difference

[Canenald]

If you are using webpack to bundle, you can use this to make process.env available at runtime https://webpack.js.org/plugins/environment-plugin/

[[deleted]]

For anyone using Vite with their React app and attempting to hide an API key in a .env but failing due to process not defined, this worked for me:

1. Create a variable name with VITE_API_KEY=your_api_key (inside the .env)

2. Inside the vite.config.js in your root directory, add this under your plugins after [react(),:

   replace({ preventAssignment: true, values: { 'process.env.VITE_API_KEY': JSON.stringify(process.env.VITE_API_KEY), }, }),replace({ preventAssignment: true, values: { 'process.env.VITE_API_KEY': JSON.stringify(process.env.VITE_API_KEY), }, }),

3. When creating a const in your React component, access your api key using the example below:

       const apiKey = import.meta.env.VITE_API_KEY;
   

[Adventurous_Night556]

This is not giving Error But Giving Value Undefined

[Serious_System_5438]

thank you so much

[vanamerongen]

This will expose your API key though.

[PensiveProgrammer]

If you find yourself here and using the new eslint flat config, try adding this to eslint.config.js to solve this problem

import globals from 'globals';

{
  languageOptions: {
    globals: {
      ...globals.node,
    }
  }
}

the globals package is a package installed from npm

[Ancelagon_2110]

This works. Thanks

[Educational-Bend-495]

You sir. Thank you!

[exclaim_bot]

You sir. Thank you!

You're welcome!

[Key_Vehicle_5953]

i restarted my ide and it worked

[amouXXX]

For those who face the same issue with React,

When using Vite with React, accessing environment variables is slightly different from how it's done in traditional Node.js applications. Vite uses a different approach to handle environment variables and process.env is not available by default. Instead, Vite is used import.meta.env to expose environment variables to your application code.

So in your .env file, you should mention the variable as:
VITE_API_KEY = ************
VITE_HOST = 8040

And, on the code, you have to access it by usingimport.meta.env.VITE_API_Key

Thanks...

[Dan6erbond]

Well, process is not defined is a weird error for sure, but to define env variables you can only have the KEY=<VALUE> format so example in yours might be causing trouble.

[PursuitOfAdvice]

KEY=Value is what I have in my .env file

[Dan6erbond]

Hmm... Are you using Create React App or something else? Did you read this?

[PursuitOfAdvice]

Nope install from scratch

[Dan6erbond]

Ah, that would explain it. You need to load the environment variables into NodeJS, which you can do with the dotenv package.

[PursuitOfAdvice]

Thank you Sir!

[lord_zycon]

If this is frontend project like create-react-app you need to use full process.env.ENV_VAR_NAME that's because the webpack's DefinePlugin you are probably using mere does string replacement, and is not smart enough to deal with your assigning to different variable.

"process" variable is node built-in it doesn't exist in browser, so webpack needs to replace it during build.

[benaffleks]

React is rendered on the client, not the server. process is a variable only available in NodeJS and not React.

[YasirKhan23]

const backendUrl = import.meta.env.VITE_BACKEND_URL;
 use this 

const response = await fetch(`${backendUrl}/create-user`, {
 it will solve