To use case-insensitive switch-case in JavaScript, make the input all upper or all lowercase.
Example
You can try to run the following code to learn how to use a case-insensitive switch:
<!DOCTYPE html>
<html>
<body>
<h3>JavaScript Strings</h3>
<p id="test"></p>
<script>
var str = "amit";
str = str.toUpperCase();
switch (str) {
case 'AMIT': document.write("The name is AMIT <br>");
break;
case 'JOHN': document.write("The name is JOHN <br>");
break;
default: document.write("Unknown name<br>")
}
document.write("Exiting switch block");
</script>
</body>
</html>