csv_parser | Callback based CSV Parser for C | CSV Processing library

You're correct that returning values from the callback in .on('end' is the source of your problem.

Streams are asynchronous. If you want to use this fast-csv library, you're going to need to return a promise from getCountries(). However, I'm assuming that's not what you want, since you're using the result in a config file, which is synchronous.

Either you need to read your csv synchronously, or you need to refactor the way your application works to be able to have your config be asynchronous. I'm assuming the second option isn't possible.

You probably want to look into using another CSV library that doesn't use streams, and is synchronous. Two examples from a quick Google search are:

• https://www.npmjs.com/package/csv-load-sync
• https://www.npmjs.com/package/csvsync

I haven't used either of these libraries personally, but it looks like they'd support what you're trying to do. I'm assuming your CSV file is small enough to all be stored in memory at once, if not, you're going to have to explore more complicated options.

As a side note, is there any specific reason that the data has to be in CSV format? It would seem to be much easier to store it in JSON format. JSON can be imported to your config file directly with require; no external libraries needed.

I figured it out.

I just had to add the path "C:\Windows\System32" in the path variable in environmental variables under Advanced System settings.