node.js - how to get the value from mongodb using node js -

node.js - how to get the value from mongodb using node js -

a.remove({"name":'sonu'},function(e,o){}); a.insert({"name":username,"title":username,"age":'25'},function(e,o){});

}); need obtain these values

a.findone({name: username}, function (e, o) {})

node.js mongodb