Array[0] undefined

Question

When I output my code I get this output:

0[object Object]

1[object Object]

I believe this is because it is an object. Although I'm pretty noob, so I believe an object is an array. Correct me if that's wrong.

I noticed the object in my console:

Objectresult: Objectadmin_county: "Somerset"admin_district: "Sedgemoor"admin_ward: "Axevale"ccg: "NHS Somerset"codes: Objectcountry: "England"eastings: 343143european_electoral_region: "South West"incode: "2WL"latitude: 51.2870673059808longitude: -2.81668795540695lsoa: "Sedgemoor 001A"msoa: "Sedgemoor 001"nhs_ha: "South West"northings: 154531nuts: "Somerset"outcode: "BS26"parish: "Axbridge"parliamentary_constituency: "Wells"postcode: "BS26 2WL"primary_care_trust: "Somerset"quality: 1region: "South West"__proto__: Objectstatus: 200__proto__: Object

it maybe neater to look at this: https://api.postcodes.io/postcodes?lon=0.080647&lat=51.626281000000006&radius=115

I am trying to separate these parts into usable items stored as variables. I tried array[0] but that is undefined. Which I assume means I need to do something more like object(array[0])

I've been searching a while and I'm not getting anywhere.

Here's my full code that I was forking from elsewhere.

$(window).ready(function() {
  $(initiate_geolocation);
});

function initiate_geolocation() {
  navigator.geolocation.getCurrentPosition(handle_geolocation_query);
}

function handle_geolocation_query(position) {
  var lat = position.coords.latitude;
  var lon = position.coords.longitude;
  var url = "https://api.postcodes.io/postcodes?lon=" + lon + "&lat=" + lat + "&radius=125";
  post(url).done(function(postcode) {
    displayData(postcode);
    // console.log("postcode says: "+postcode);
    console.log(postcode[0[1]]);
  });
}

//display results on page
function displayData(postcode) {
  var html = "";
  $('#text').hide();
  for (var index in postcode['result']) {
    html += "<div class='row'>";
    html += "<div class='cell'>";
    html += index.replace(/_/g, ' ').strFirstUpper();
    html += "</div><div class='cell'>";
    html += postcode['result'][index];
    html += "</div></div>";
    console.log(postcode)
  }
  $('#text').html(html).fadeIn(300);
}

//ajax call
function post(url) {
  return $.ajax({
    url: url,
    success: function() {
      //woop
    },
    error: function(desc, err) {
      $('#text').html("Details: " + desc.responseText);
    }
  });
}

//uppercase 
String.prototype.strFirstUpper = function() {
  return this.charAt(0).toUpperCase() + this.slice(1);
}

@import url(//fonts.googleapis.com/css?family=Roboto);
html {
  font-family: 'Roboto', sans-serif;
}

.header {
  position: fixed;
  z-index: 10;
  width: 100%;
  background: -moz-linear-gradient(90deg, #394D66, #3A5B85);
  background: linear-gradient(90deg, #394D66, #3A5B85);
  height: 80px;
  min-width: 500px;
}

h1 {
  font-weight: 400;
  text-align: center;
  margin: 0px;
  font-size: 1.5em;
  color: #9DC3EB;
  text-transform: uppercase;
}

h1 span {
  font-size: 0.8em;
  text-transform: lowercase;
  color: #E0E0E0;
}

.row {
  width: 100%;
  font-size: 1.2em;
  padding: 5px 0px;
  border-bottom: 1px solid #ccc;
}

.inputHolder {
  width: 100%;
  font-size: 20px;
  text-align: center;
}

.inputHolder input {
  text-align: center;
  color: #333;
}

.cell {
  display: inline-block;
  width: 49%;
  color: #393939;
}

.row .cell:first-child {
  text-align: right;
  padding-right: 10px;
}

.row:hover {
  background: #ccc;
}

#text {
  z-index: 0;
  padding: 90px 0px;
  width: 60%;
  margin: 0px auto;
  min-width: 500px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.3/modernizr.min.js"></script>
<div class='header'>
  <h1><span>Postcode Seach with</span> Postcodes.io</h1>
  <!-- <div class='inputHolder'>
    <input placeholder='Postcode' type='text' id='txtPostcode'/>
    <input type='button' value='Search' id='btnPostcode'/>
  </div>
  -->
</div>


<div id='text'></div>

Eventually i want this code to ask you for permission to discover your location when you open the page and then find your post code (using postcode.io). I've got most of the way there but my noobishness is hurting me badly. Any help is much appreciated.

The code must be https to run geolocation.