CORS error when trying to run via npm run start

[Erudition]

It launches the browser to localhost:3000, which loads the web page, but as soon as you try to use it nothing happens.
The API is running on port 8080 apparently, so this is a CORS violation as they are considered different domains.

Here is what gets spammed in the console:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:8080/api/projects. (Reason: CORS request did not succeed)

I found https://stackoverflow.com/questions/31602697/webpack-dev-server-cors-issue and other possible solutions, but I couldn't find where to put it, as there doesn't seem to be a server in this repo.