How to get copy response in NodeJS?

I'm running the copy from stdin command from node.js just like this site suggests to do:
But, I don't know how to get the result of the copy command. For instance, I've copied in data and the data doesn't fit the table, so no rows get inserted. When I do this from dbvisualizer, it doesn't give me an error, but it says that 0 rows were affected. I don't know how to get those results from node.js.

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