I am trying to find any sample projects or articles to guide me how to use
Jourbey Builder from a
nodeJs server. Is there any link available for it.
From Journey Builder For Apps page
All I see are the sdks for
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The example provided in the previous answer is great if you are looking to build a custom activity for Journey Builder. If you are simply wanting to use NodeJS to get Subscribers into an existing interaction within Journey Builder, then there is a REST API that can be used which is documented at: https://code.exacttarget.com/app-development/journey-builder-development/events/how-to-fire-an-event.html
There is a client for Marketing Cloud REST APIs for NodeJS at: https://github.com/ExactTarget/node-fuel
You can refer to this Github example - I've used this successfully earlier.
The key files to look at are
app.js - Triggers the sample app
routes/activity.js - has the various activity handling methods
Feel free to post another thread if you run into any issues.