Hi I got a general question, so I don't confuse things. Let's say I want to built a simple REST api, for this I would need a backend written in node or whatever language. So could I "replace" that part by using supabase, so I would basically use the supabase api and database to create crud operation. I would not need to create a backend from scratch so to say right?

That's correct. Many use cases would replace their traditional backend API with Supabase entirely because it's more efficient and cost effective to have only 1 source of data. In this case, all the data you'd need would be inside your database and you'd use one of the client libraries like

supabase-js

to interact with the database. Other use cases, particularly if they need to interact with third party API's (e.g. data aggregation from multiple sources), would still run some sort of backend in addition to Supabase. In this case, some data might be inserted into the database, but only requested from the third party API when it's actually needed, usually to minimise the risk of huge usage bills.

Thanks a lot for the answer. I am going to built a smaller application which basically just has CRUD operation and I am existed to use supabase 🙂