javascript - Getting Promise Pending with Firebase and Express/Node.js -

i've run trouble working firebase. i'd retrieve data firebase database using express server , pass data object can use in jade templates. want take data 2 different endpoints , set data value of key in firebasedata object you'll see below. instead of receiving object keys , values expect 2 values each promise {<pending>}. log firebasedata object out in console see , nothing rendered in dom. rendering page quickly? here code working with:

app.get("/cac", function(req, res){    var firebasedata = {};    function getfirebasedata(endpoint){     return firebase.database().ref(endpoint).once("value", function(snapshot){           return snapshot.val();     });   }    firebasedata.members = getfirebasedata("cac_members");    firebasedata.events = getfirebasedata("cac_events");    console.log(firebasedata);   res.render("cac", firebasedata);  }); 

in console:

{ members: promise { <pending> },   events: promise { <pending> } } 

i haven't had experiences promises feel i'm doing should working. there better way doing this? i'd appreciate pointers!

the firebase data loaded asynchronously. promises 1 way of dealing , they're great fit need.

your code needs wait until promises fulfilled, easy promise.all():

app.get("/cac", function(req, res){    var firebasedata = {};    function getfirebasedata(endpoint){     return firebase.database().ref(endpoint).once("value", function(snapshot){           return snapshot.val();     });   }    promise.all([getfirebasedata("cac_members"), getfirebasedata("cac_events")).then(function(snapshots) {     firebasedata.members = snapshots[0];     firebasedata.events = snapshots[1];     console.log(firebasedata);     res.render("cac", firebasedata);   }); });