Domain doesnt matter i guess

Beacuse its always /api/test.js

No matter domain

so you simply can't change the domain

Nextjs always gave /api in it

You can use express js if u want api.something.com

yeah im currently switching from express to next bc serverless makes more sense, currently deployed on api.domain.com and wanted to see if i count keep that not a big issue tho

if you use app router, you can absolutely remove /api

this is incorrect for app dir

if you use the app router, you dont need the /api part

if you use the pages router, you need the /api part, but you can always deploy it to, say, jgoon.domain.com/api and then make another app at api.domain.com that rewrites to this jgoon.domain.com/api.