nodejs - mongodb native find all documents

You can stream the results of a node.js native driver's query by calling stream() on the returned cursor:

var stream = collection.find().stream();
stream.on('data', function(doc) {
    console.log(doc);
});
stream.on('error', function(err) {
    console.log(err);
});
stream.on('end', function() {
    console.log('All done!');
});

The easiest way is to use a Cursor (reference):

var cursor = db.collection('test').find();

// Execute the each command, triggers for each document
cursor.each(function(err, item) {
    // If the item is null then the cursor is exhausted/empty and closed
    if(item == null) {
        db.close(); // you may not want to close the DB if you have more code....
        return;
    }
    // otherwise, do something with the item
});

If there's a lot of computation you need to do, you might consider whether a Map-Reduce (reference) would fit your needs as the code would execute on the DB server, rather than locally.