Troubleshooting Twitch API response in JavaScript

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1

I’m having a weird problem with my JavaScript code that interacts with the Twitch API. I’ve created a function called fetchStreamInfo that should return JSON data, but it’s giving me undefined instead. The strange part is that when I log the data right before the return statement, it shows up correctly.

Here’s a simplified version of my code:

function fetchStreamInfo(streamName) {
  const apiUrl = `https://api.twitch.tv/helix/streams?user_login=${streamName}`;
  
  $.ajax({
    url: apiUrl,
    headers: { 'Client-ID': 'your_client_id_here' },
    success: function(response) {
      console.log(response); // This logs the data correctly
      return response;
    },
    error: function(xhr, status, error) {
      console.error('API request failed:', error);
    }
  });
}

// Trying to use the function
const streamData = fetchStreamInfo('some_stream_name');
console.log(streamData); // This logs undefined

Why isn’t the function returning the data as expected? Am I missing something obvious here? Any help would be appreciated!

2

hey mate, the problem is ur using ajax which is async. so ur function returns before the data comes back. u need to use promises or async/await to handle this. try something like this:

function fetchStreamInfo(streamName) {
return new Promise((resolve, reject) => {
$.ajax({
// ur existing ajax code here
success: resolve,
error: reject
});
});
}

then u can use it like fetchStreamInfo(‘stream’).then(data => console.log(data));

3

The issue you’re encountering is due to the asynchronous nature of AJAX requests. Your fetchStreamInfo function doesn’t actually return anything directly. Instead, the success callback is executed after the AJAX call completes, but by then, the function has already finished executing.

To resolve this, you’ll need to use Promises or async/await. Here’s how you could modify your function using a Promise:

function fetchStreamInfo(streamName) {
  return new Promise((resolve, reject) => {
    const apiUrl = `https://api.twitch.tv/helix/streams?user_login=${streamName}`;
    
    $.ajax({
      url: apiUrl,
      headers: { 'Client-ID': 'your_client_id_here' },
      success: function(response) {
        resolve(response);
      },
      error: function(xhr, status, error) {
        reject(error);
      }
    });
  });
}

// Usage:
fetchStreamInfo('some_stream_name')
  .then(streamData => console.log(streamData))
  .catch(error => console.error('Error:', error));

This approach wraps the AJAX call in a Promise, allowing you to handle the asynchronous data properly.