Like others have said you need to provide a unique User-Agent in the HTTP header.
Since you're using NodeJS, I'm assuming you're using a library like require.
Fixing this is as easy as changing code from this:
require(url, callback);
To this:
var options = { url: url, headers: { 'User-Agent': 'Unique user agent goes here.' } };
require(options, callback);
This is a pretty easy fix. Just look up how to change the HTTP Header in whatever library or node-module you're using.
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