Use the Number() method in JavaScript to convert to Number. You can try to run the following code to learn how to convert -Infinity Number in JavaScript.
Example
<!DOCTYPE html>
<html>
<body>
<p>Convert -Infinity to Number</p>
<script>
var myVal = -Infinity;
document.write("Number : " + Number(myVal));
</script>
</body>
</html>Output
Convert -Infinity to Number Number : -Infinity