Compare fonction

Ok, hello everyone, sorry in advance for my average English (google trad, you know) Here, I would like to make sure to compare the novelties that come from my API, with what ALREADY exists on my google task

Hi @YDeltagon, it looks like your API requires credentials which I don’t have. Would you be able to share the data you receive in your HTTP Request node (you can of course redact anything confidential)?

As a very basic example, you can use the Merge node’s Remove Key Matches operation to keep only those items returned by your API which do not exist in Google Tasks yet.

The blog post at How to synchronize data between two systems (n8n.io) talks about the basic concept in more detail.