nodejstest.js

var Db = require('/usr/local/lib/node/mongodb').Db,
    Server = require('/usr/local/lib/node/mongodb').Server;

var client = new Db('nodejs_test', new Server("127.0.0.1", 27017, {}));

client.open(function(err,p_client) {
        client.createCollection('test_insert', function( err, collection ){
                client.collection('test_insert', function(err,collection) {
                        collection.save({_id:ObjectId('4d4c45209a54301520000001'),d:3}, function(err,docs) {console.log(err)});
                })
        })
});

process.exit(1);