In the article Debugging Google Cloud Functions in Node we exposed a first approach of what Google Functions Framework was and how could it be used. The article was mainly focused on debugging Google Cloud Function with HTTP signature, ie, those functions intended to be triggered by an HTTP request. There are however other ways of triggering the execution of a Google Cloud Function, as for instance Cloud Storage , Firestore or, more commonly, by forwarding a Pub/Sub message . This article covers how to debug Google Cloud functions intended to be triggered by a Pub/Sub message. Google Cloud functions with cloud event signature Let's assume we have a function that must be triggered by a Pub/Sub message. To do that, we need to perform two actions: Properly configuring Google Cloud to specify that our function will be triggered by a given kind of Pub/Sub message. This part is described in the official documentation and it's out of the scope of this article