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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSV Upload</title>
</head>
<body>
    <h1>Upload CSV File</h1>
    <form id="uploadForm" enctype="multipart/form-data" method="post">
        <input type="file" name="file" accept=".csv">
        <input type="submit" value="Upload">
    </form>
    <div id="result"></div>

    <script>
        document.getElementById('uploadForm').addEventListener('submit', function(event) {
            event.preventDefault();
            const form = new FormData(this);
            fetch('/upload_csv', {
                method: 'POST',
                body: form
            })
            .then(response => response.json())
            .then(data => {
                document.getElementById('result').innerText = JSON.stringify(data, null, 2);
            })
            .catch(error => {
                console.error('Error:', error);
            });
        });
    </script>
</body>
</html>