https://www.npmjs.com/package/node-red-contrib-snap4city-user
Is there any documentation for these nodes ? What are they ? Why should I care ?
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are nodes that allow to exploit the smart city API of Km4City. https://www.km4city.org
whcih is a totally open source platform for smart city.
the smart city API are documented in the mentioned portal
and also in swagger: https://www.km4city.org/swagger/external/
I cannot put more than two links in the post 
the classic doc per node is into the package
If you read the documentation on packaging on the website it should guide you as to where the info should be found.
https://nodered.org/docs/creating-nodes/packaging
