By googling them I suppose. Most modern opensource projects have repos on github. Here is a bunch of opensource nodejs projects. Since almost no one writes their backend apps from scratch, but instead they use some kind of framework you may search for what frameworks are currently popular with nodejs and find apps, written on them.
If you have no prior experience with nodejs you may wish to start from tutorials and guides from node js docs page
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By googling them I suppose. Most modern opensource projects have repos on github. Here is a bunch of opensource nodejs projects. Since almost no one writes their backend apps from scratch, but instead they use some kind of framework you may search for what frameworks are currently popular with nodejs and find apps, written on them.
If you have no prior experience with nodejs you may wish to start from tutorials and guides from node js docs page