It depends entirely on your preference.
There are dedicated platforms to host JUST a node application or you can grab a full VPS - AWS, Linode, Digital Ocean, Azure, Google Cloud to name a few.
Personally, I have multiple VPSes hosted at https://netcup.eu, for which I could also give you a discount / referral code. Those Servers also run a multitude of other applications for me and require knowledge of Linux or a Windows Server License.