React Js Convert Image to Base64 Encoded Binary

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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>Image to Base64</title>
</head>
<body>
    <h1>Javascript Convert Image to Bas64 String</h1>
    <input type="file" id="imageInput" onchange="convertToBase64()">
    <textarea id="base64Output" rows="10" cols="50"></textarea>
​
    <script>
        function convertToBase64() {
            const input = document.getElementById('imageInput');
            const output = document.getElementById('base64Output');
​
            const file = input.files[0];
            const reader = new FileReader();
​
            reader.onloadend = function () {
                output.value = reader.result;
            }
​
            if (file) {
                reader.readAsDataURL(file);
            } else {
                output.value = "Please select an image.";
            }
        }
    </script>
</body>
</html>
​