Create Json

Is there any node except function nodes that can be used to create a JSON something similar to SET node. The problem with the function node is that there is no way to map items and it takes to long to copy every path? I want it to be independent of the HTTP node as well.

Not sure if I understand what you want the node to do exactly. Can you please give an example.
Do you mean literally a JSON-string or really a JavaScript-Object?

I would like a node similar to SET or the HTTP but where you could build a custom JSON and where the function is there to map against earlier nodes.

So lets say just like the HTTP requests are working with rawbody but where the node only should create a JSON and not make HTTP request.

I hope you understand the explanation