Catch specific Exception in JavaScript

Question

I know that using following block, it is able to catch an Exception.

try{
    // Code
}catch(err){
    alert(err.message);
}

Say, I want to catch a NumberFormatException. How can I catch a specific Exception using JavaScript?
(I actually want to catch NumberFormatException, InterruptedException, ConnectException which are well defined in Java)

JavaScript is not Java. There is no NumberFormatException in JavaScript, nor InterruptedException, nor ConnectException. JavaScript has as much in common with Java as a manhole has with a man. If you wish to know whether a string is a well-formed number or not, use isNaN() on the result of parseInt() or parseFloat(). — Amadan
– Amadan, Commented Oct 14, 2014 at 10:08
developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Prabhu Murthy
– Prabhu Murthy, Commented Oct 14, 2014 at 10:09
this thread has more answers stackoverflow.com/questions/1433558/… — Dominic Johnston Whiteley
– Dominic Johnston Whiteley, Commented Jul 13, 2022 at 0:42

simonzack · Accepted Answer · 2014-10-14 10:08:41Z

8

Javascript has no standard way of doing this.

try{
    // Code
}catch(err){
    if(err instanceof SomeException){
        alert(err.message);
    }
}

Firefox has an extension, which I think is nice and should be more standard.

answered Oct 14, 2014 at 10:08

simonzack

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