What aggregation cursor methods are supported by Nodejs drivers?

What actually gets returned from aggregate with a cursor is a node transform stream interface with a few other convenience methods, notably:

explain: [Function],get: [Function],getOne: [Function],each: [Function],next: [Function],

Which you can obtain by simply dumping the cursor object using console.log. Those should be self explanatory with the get() method being equivalent to .toArray().

Since this is a standard streaming interface the methods and event handlers are available as per this interface, so with an example:

  var MongoClient = require('mongodb').MongoClient;  MongoClient.connect("mongodb://localhost/test", function(err,db) {    var items = [];    var counter = 0;    var cursor = db.collection('tags').aggregate(      [        { "$project": {          "t1": 1,          "t2": 1        }}      ],      { "cursor": { "batchSize": 25 } }    );    console.log( cursor );    cursor.on('data', function(data) {      console.log( this );  // dump the current state info      items.push( data );      counter++;    });    cursor.on('end', function() {      console.log( "Iterated " + counter + " times" );    });  });

The "data" event is fired with each cursor iteration and properties on the object will show whether the stream is complete or still iterating and so on.