[Support Guide] Using environment variables on Netlify correctly

[Matos28]

Hi all,

I have set my netlify.toml file with [context.deploy-preview.environment] NODE_ENV = "development", but when I create a pull request, my NODE_ENV variable does not change , even if the context indicated during build is ❯ Context deploy-preview

I am using it in a function for a Gatsby site :

function dosmthng() {

  if (process.env.NODE_ENV === "production") {
   // do Something
  } else {    // do Something else }
}

And the result is always ‘// do something’ , even when I am in deploy-preview context…

What am I missing ?

[SamO]

Hi, @Matos28 welcome to the forums. Try these things:

1. Did you make sure that you have saved the changes to your netlify.toml file and committed them to your repository before creating the pull request?
2. Check that the environment variable NODE_ENV is set correctly; go to the “Build & deploy” section, and click on the "Environment" tab to see a list of environment variables. Make sure that NODE_ENV is listed and set to the correct value for the deploy-preview context.
3. Finally give this guide a read and see if it helps answer your question: [Support Guide] Compiled Build and Deploy Resources -- start here!

[matriar]

Hello everyone!

I’m wondering is it possible to reassign default Netlify env var to my own env var that is used by my app?
So for instance, Netlify provides $URL env var - url of a deployed site. My app uses $AAA env var.
Is it possible somewhere in the admin dashboard to assign a custom env var this way?

env var AAA = $URL
smth like this:

[jasiqli]

As stated in this documentation URL is a read-only variable. If you require a different value than provided by Netlify, you’ll need to set another variable @matriar .

[matriar]

@jasiqli thanks,
yeah, I see it is read-only. I don’t want to reassign it, I’d like to use it as a value for another env var.

[jasiqli]

AFAIK that is not possible. At least not via the UI.

Using this example

@fool

npm run build && echo $CONTEXT > public/netlify-context.txt

possibly you could write that variable to a location then read it.

Or using this one

@fool

sed -i s/PLACEHOLDER/${VARIABLENAME}/g webpack.js && my-usual-build-command

do preprocessing replace a placeholder value with that of $URL before building.

[matriar]

for anyone who’ll fall here
If you need Netlify env var to be fallthrough as different name:
updates to the build command npm run build → YOUR_VAR=$URL npm run build could make a trick.

It’s a bit ugly and poor scalable but for a MVP it is enough =)

[abeebabdullahi033]

Please I need help my site is being attcaked:

Why is my env key showing on the source page on Netlify

I noticed that whenever I check the main.js file on the source tab of my website lunched on Netlify I noticed that my environmental variable is showing and I use the Environmental variable on Netlify to avoid this but some how it is showing. And this allow people to keep attcaking my site. Is there anything I can do to stop making the environmental variable showing. Please help. This the source tab of my website. [Screenshot 2023-09-24 at 17.45.36] This is my Netlify Envirnomental variable […

[SamO]

please do not open a thread that is not related to your original post.