How to reach contents of a nested JSON response body in javascript?

I need to automate some API tests with frisby.js, and I'm stuck at accessing to some data which is nested inside JSON response body.

Below is my code

var frisby = require('c:/frisby');

frisby.create('Request available Voyages')
    .post('someURL', {
        departureVoyage: {
            from: "500",
            to: "500",
            date: '2017-01-07'}})
    .inspectJSON()
    .afterJSON(function (voyage) {
       console.log(voyage.departureVoyage.voyages);}

Below is the output of inspectJSON() function

{ type: 'voyageResponseWsDTO',
  departureVoyage:
   { date: '2017-01-07',
     voyages:
      [ { endTime: '22:30',
          quotas:
           [ { id: '8796095719239',
               limit: 66,
               name: 'PROMOTION',
               price: '34',
               priceCurrency: 'USD' },
             { id: '8796095620935',
               limit: 271,
               name: 'ECONOMY',
               price: '51',
               priceCurrency: 'USD' },
             { id: '8796095489863',
               limit: 19,
               name: 'BUSINESS',
               price: '72',
               priceCurrency: 'USD' },
             { id: '8796234721095',
               limit: 0,
               name: 'CAR PROMOTION',
               price: '84',
               priceCurrency: 'USD' },
             { id: '8796095752007',
               limit: 2,
               name: 'VIP',
               price: '800',
               priceCurrency: 'USD' } ],
          time: '20:00',
          vessel:
           { carriesVehicles: true,
             TypeCode: 'FE',
             TypeName: 'Ferry' } } ] } }

and below is the output of console.log(voyage.departureVoyage.voyages);

[ { endTime: '22:30',
    quotas: [ [Object], [Object], [Object], [Object], [Object] ],
    time: '20:00',
    vessel:
     { carriesVehicles: true,
       TypeCode: 'FE',
       TypeName: 'Ferry' } } ]

My problem is, when I try to access content of "quotas" with "console.log(voyage.departureVoyage.voyages.quotas);" I get "undefined" message. Do you know a way how can I reach data of this "quotas"? Because I need to reach properties of this "quotas", like id of one them.

Thanks

voyage.departureVoyage.voyages is an array, and quotas is in the first item of that array,

So refer it like below for quotas inside it,

voyage.departureVoyage.voyages[0].quotas