Access the JSON Data from an API

JavaScript
1

Tell us what’s happening:

Your code so far


<script>
  document.addEventListener('DOMContentLoaded',function(){
    document.getElementById('getMessage').onclick=function(){
      req=new XMLHttpRequest();
      req.open("GET",'/json/cats.json',true);
      req.send();
      req.onload=function(){
        json=JSON.parse(req.responseText);
        document.getElementsByClassName('message')[0].innerHTML=JSON.stringify(json);
        // Add your code below this line
        console.log(json[2].altText);
        
        // Add your code above this line
      };
    };
  });
</script>
<style>
  body {
    text-align: center;
    font-family: "Helvetica", sans-serif;
  }
  h1 {
    font-size: 2em;
    font-weight: bold;
  }
  .box {
    border-radius: 5px;
    background-color: #eee;
    padding: 20px 5px;
  }
  button {
    color: white;
    background-color: #4791d0;
    border-radius: 5px;
    border: 1px solid #4791d0;
    padding: 5px 10px 8px 10px;
  }
  button:hover {
    background-color: #0F5897;
    border: 1px solid #0F5897;
  }
</style>
<h1>Cat Photo Finder</h1> 
<p class="message box">
  The message will go here
</p>
<p>
  <button id="getMessage">
    Get Message
  </button>
</p>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/data-visualization/json-apis-and-ajax/access-the-json-data-from-an-api

2

I would like to suggest that you use the newer fetch API. It is alot cleaner imo.

Beware that fetch returns a promise which has to resolve. There is an easy way to wait for a promise: .then.

a req would look like this:

fetch(‘url’)
.then(res =>res.json())
.then(data => do something(data))

The arrows are simply arrow functions in case you are wondering. And res.json is necessary to parse the json from req.body. here is a link about fetch.

https://www.google.at/url?sa=t&source=web&rct=j&url=https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch&ved=2ahUKEwiK0bCg8bHbAhUJPVAKHZMBA_wQFjABegQIBxAB&usg=AOvVaw3Kkf8Qr_xPvBDQkMzp4VHv

3

HI, when you look at the JSON File you can see that Loki is listed here

{
"id": 2,
"imageLink": "https://s3.amazonaws.com/freecodecamp/mischievous-cat.jpg",
"altText": "A ginger cat with one eye closed and mouth in a grin-like expression. Looking very mischievous. ",
"codeNames": [
"The Doctor",
"Loki",
"Joker"
]
}

The solution to your question is that you have to access this code, because accessing an array always begins with a 0

console.log(json[2].codeNames[1]);

Hope that helps.
Cheers Ch

7 Likes