Setting the logo icon based on the current dataset using environment variables in Sanity Studio.

I am trying to set the logo icon based off the current dataset. I am using SANITY_STUDIO_API_DATASET emv variable but it is always undefined. As matter of fact all sanity env variables are unset all the time.

Hey Petar! The fact that they're all coming through undefined makes me think of this section of the docs:

Environment variables don't inherit their values from

sanity.json

and will be

undefined

until explicitly set.

Thanks Rachel. I was searching for a way to define a theme based off the active dataset.

Thanks Rachel. I was searching for a way to define a theme based off the active dataset.

Hi Petar. I just gave the following a try and it worked, so maybe you can step through it and confirm you did everything the same. If you did, we’ll continue to troubleshoot from there.
First, you’ll want to have two files in the root of your studio folder:

.env.development

and

.env.production

. It’s important they’re at the root—at the same level as your

sanity.json

file. Edit the following to align with the names of your datasets, but you’ll want something like:


Next, you’ll want to make a file to handle the logic of which dataset you’re in, and then output the correct “logo” (or, in my case, I’ll just put text). This file can be named whatever you want and can live wherever you want, but I’ll use

Logo.js

in the root of the studio folder:

Finally, you’ll want to tell your studio that it needs to implement that Logo file. You can open your

sanity.json

file and add the following to `"parts"`:

Now, your

sanity.json

file might look something like this:

There are additional steps you can take if you want, such as implementing Spaces or defining a theme based on your environment. However, you can test this out by running your studio as such:

sanity start

// Should start in your development environment
// Should start in your production environment

Hi Petar. Did you have any luck with this? Wanted to follow up and make sure you got things working as expected.