Access properties of Javascript variable -

i want access specific properties of response object received request server.

getrespondersinrange: function() {     this.$http.get('v1/responders?'.concat("latitude=" + this.latitude + "&longitude=" + this.longitude)).then(function(response) {         this.responders = response.data["data"];         console.log(this.responders);     }.bind(this)); }, 

the console.log returns this:

i want access field "userreference", can't find out how. tried:

1. console.log(this.responders["userreference"]
2. console.log(this.responders.userreference

it returns array, try access property way:

this.responders[0]["userreference"];