To be honest I don't understand the question (most likely my bad). Would something like this help /?userID=94564,5464,46464 then you take the number and split them.
If my tutorial on Building a RESTful API with Express and MongoDB doesn't answer it, then I'm happy to help if you could give me some more info!
I think that tutorial does answer it. Now I'm just trying to get this example to work on my Digital Ocean server :) Trying to figure out this Babel stuff to be able to run 'import' :) haha. Lots of fun and learning.
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