Stock Market Tracker JavaScript, API

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```javascript
// This example uses the Fetch API to retrieve stock data from a free API
// (e.g., Alpha Vantage).  You'll need an API key from Alpha Vantage
// or another stock data provider.  Replace "YOUR_API_KEY" with your actual key.
//
//  Please note:  Free APIs often have rate limits, so be mindful of how frequently
// you make requests.

const apiKey = "YOUR_API_KEY"; // Replace with your actual API key
const symbol = "AAPL"; // Example stock symbol: Apple
const apiUrl = `https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&symbol=${symbol}&interval=5min&apikey=${apiKey}`;


async function getStockData() {
  try {
    const response = await fetch(apiUrl);

    if (!response.ok) {
      throw new Error(`HTTP error! Status: ${response.status}`);
    }

    const data = await response.json();

    // Check for errors in the Alpha Vantage response
    if (data.hasOwnProperty('Error Message')) {
       throw new Error(`API Error: ${data["Error Message"]}`);
    }
    if (data.hasOwnProperty('Note')) {
        console.warn("API Note: " + data["Note"]);  //Log rate limit warnings
    }


    const timeSeries = data["Time Series (5min)"];

    if (!timeSeries) {
      throw new Error("Could not retrieve time series data.");
    }


    // Get the most recent data point
    const latestTime = Object.keys(timeSeries)[0];
    const latestData = timeSeries[latestTime];

    const open = latestData["1. open"];
    const high = latestData["2. high"];
    const low = latestData["3. low"];
    const close = latestData["4. close"];
    const volume = latestData["5. volume"];

    console.log(`Stock: ${symbol}`);
    console.log(`Time: ${latestTime}`);
    console.log(`Open: ${open}`);
    console.log(`High: ${high}`);
    console.log(`Low: ${low}`);
    console.log(`Close: ${close}`);
    console.log(`Volume: ${volume}`);

    // Update the HTML (optional) - Example
    document.getElementById("stockSymbol").textContent = symbol;
    document.getElementById("stockTime").textContent = latestTime;
    document.getElementById("stockOpen").textContent = open;
    document.getElementById("stockHigh").textContent = high;
    document.getElementById("stockLow").textContent = low;
    document.getElementById("stockClose").textContent = close;
    document.getElementById("stockVolume").textContent = volume;



  } catch (error) {
    console.error("Error fetching or processing stock data:", error);

    // Update the HTML to show the error (optional)
    document.getElementById("stockData").textContent = "Error loading stock data. Check console for details.";
  }
}


// Call the function to fetch and display stock data
getStockData();

// Optionally, set an interval to update the data periodically
// setInterval(getStockData, 60000); // Update every 60 seconds (1 minute)


// Basic HTML structure (place this in your HTML file):
/*
<!DOCTYPE html>
<html>
<head>
  <title>Stock Market Tracker</title>
</head>
<body>
  <h1>Stock Market Tracker</h1>
  <div id="stockData">
    <p>Stock: <span id="stockSymbol"></span></p>
    <p>Time: <span id="stockTime"></span></p>
    <p>Open: <span id="stockOpen"></span></p>
    <p>High: <span id="stockHigh"></span></p>
    <p>Low: <span id="stockLow"></span></p>
    <p>Close: <span id="stockClose"></span></p>
    <p>Volume: <span id="stockVolume"></span></p>
  </div>

  <script src="your_script.js"></script>
</body>
</html>
*/
```
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Stock Market Tracker JavaScript, API

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