Here's a (slightly out of date) map of protected bike lanes in JC: https://bikejc.github.io/maps?l=wb

In the settings in the lower right of that page, you can also toggle a layer showing the "Bike Master Plan" that was passed by the planning board in 2019: https://bikejc.github.io/maps?l=wbp

I also just put the Bike Master Plan PDF onto a webpage for easier browsing; you can see the full proposed map here: https://bikejc.github.io/bike-master-plan/#map

The data for the maps above mostly came from the city's ArcGIS; this map contains unprotected bike lanes, this one contains bike parking locations. They're also not totally up-to-date.

I'll hopefully be helping update and develop all this further in the next couple months, as I have some time off from work.