In http://mongodb.github.com/node-mongodb-native/api-articles/nodekoarticle1.html there're few examples indicating the following piece of code:

collection.update(

{mykey:2}

, {$push:{docs:{doc2:1}},

{safe:true}

, function(err, result) {});

It should be:

collection.update(

{mykey:2}

, {$push:{docs:

{doc2:1}

}},

{safe:true}

, function(err, result) {});