Live Demo: JavaScript Convert String to Boolean

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JavaScript Convert String to Boolean</title>
</head>
<body>
    <script>
    // Defining a custom function
    function stringToBoolean(value){
        return (String(value) === '1' || String(value).toLowerCase() === 'true');
    }

// Performing some tests
    console.log(stringToBoolean(true));      // Prints: true
    console.log(stringToBoolean("true"));    // Prints: true
    console.log(stringToBoolean("True"));    // Prints: true
    console.log(stringToBoolean("TRUE"));    // Prints: true
    console.log(stringToBoolean(false));     // Prints: false
    console.log(stringToBoolean("false"));   // Prints: false
    console.log(stringToBoolean("False"));   // Prints: false
    console.log(stringToBoolean(undefined)); // Prints: false
    console.log(stringToBoolean(null));      // Prints: false
    console.log(stringToBoolean(1));         // Prints: true
    console.log(stringToBoolean(0));         // Prints: false
    </script>
    <p><strong>Note:</strong> Press Ctrl+Shift+J (Windows / Linux) or Cmd+Opt+J (Mac) to open Browser Console panel.</p>
</body>
</html>