使用地图或模板在节点流中转换JSON

I'm relatively new to Javascript and Node and I like to learn by doing, but my lack of awareness of Javascript design patterns makes me wary of trying to reinvent the wheel, I'd like to know from the community if what I want to do is already present in some form or another, I'm not looking for specific code for the example below, just a nudge in the right direction and what I should be searching for.I'm relatively new to Javascript and Node and I