JSON undefined or null

Question

Im trying to access a API and heres the tree i want to access:

{"19777621": [{
   "queue": "RANKED_SOLO_5x5",
   "name": "Vladimir's Maulers",
   "entries": [{
      "leaguePoints": 0,
      "isFreshBlood": false,
      "isHotStreak": true,
      "division": "I",
      "isInactive": false,
      "isVeteran": false,
      "losses": 34,
      "playerOrTeamName": "Razdiel",
      "playerOrTeamId": "19777621",
      "wins": 36
   }],
   "tier": "PLATINUM"
}]}

I managed to do a lot of examples but this is the one i really cant figure out how it works, im sure i can the response body but if i try to do something it comes as undefined blank or Object.

<head>
    <script src="//code.jquery.com/jquery-1.12.0.min.js"></script>
    <script src="/js/json2.js"></script>
    <script src="/js/json_parse.js"></script>
</head>
<body>
<script>
$.ajax({
url: 'https://euw.api.pvp.net/api/lol/euw/v2.5/league/by-summoner/19777621/entry?api_key=b05c2777-462b-4bcc-ac2a-a3223bb74876',
type: 'GET',
dataType: 'json',
data: {

},
success: function (json) {
document.write("The Result Is:")

    JSON_Encoded = json;
    JSON_Decoded = JSON.stringify(json);
    document.write(JSON_Decoded[19777621].name[0])
    document.write(JSON_Decoded[19777621].entries.losses[0])

},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert("error getting Summoner data!");
}
});

</script>

I know im doing something wrong i just wanted to know what

Have you tried using a tool like Postman? It allows you to send POST and GET requests to URL's, and shows you the response. It's really useful for testing API's, most likely your API is giving you an error that isn't in a JSON format. EDIT: Or just use Parse instead of stringify, thanks other comments can't believe I missed that. — Glubus
– Glubus, Commented Feb 25, 2016 at 14:02
JSON.stringify turns an object into a, well, JSON string. The reverse is JSON.parse! And you probably don't need either, since the response will probably already be decoded. — deceze
– deceze ♦, Commented Feb 25, 2016 at 14:02
when you're accessing your object too you'd want JSON_Decoded[19777621][0].name — Crawdingle
– Crawdingle, Commented Feb 25, 2016 at 14:06
i did all the changes you guys said and it still doesnt give me anything at all: JSON_Decoded = JSON.parse(json); document.write(JSON_Decoded[19777621][0].name) — Paulo Botelho
– Paulo Botelho, Commented Feb 25, 2016 at 14:07
thanks deceze i should stop a bit and learn how to debug my own stuff — Paulo Botelho
– Paulo Botelho, Commented Feb 25, 2016 at 14:32

Moumit · Accepted Answer · 2016-02-25 14:31:11Z

1

You could write it in this way ...

$.ajax({
url: 'https://euw.api.pvp.net/api/lol/euw/v2.5/league/by-summoner/19777621/entry?api_key=b05c2777-462b-4bcc-ac2a-a3223bb74876',
type: 'GET',
dataType: 'json',
data: {

},
success: function (json){
  document.write("The Result Is:")

  //JSON_Encoded = json;
  //JSON_Decoded = JSON.stringify(json);   
  document.write(json['19777621'][0].name)
  document.write(json['19777621'][0].entries[0].losses)

},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert("error getting Summoner data!");
}
});

edited Feb 25, 2016 at 14:31

answered Feb 25, 2016 at 14:25

Moumit

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