Clean way to handle different exceptions in Javascript?

Question

I'm Java developer and I'm now learning Javascript creating a personal project. I don't know how to handle different errors in Javascript in a clean way and I can't find a good solution on the web.

I'm consuming some external APIs using axios. The external resource use a pagination system, so when I get back a 204 status code means that there are not more pages to consume, so I've to perform a different action than the others error.

In Java I would have created a MyException class and added another catch. How to do in Javascript?

I don't really like how I do it. There's a better or cleaner way to do it? Maybe I should save 'NO_PAGE' as global constant? Here is a code example:

const myFunc = async () => { try { //... Some code using axios } catch (error) { if (error.request._currentRequest.res.statusCode === 204) { throw Error('NO_PAGE'); } else { throw Error("Can't get goods: \n" + error.message); } } }; 

const myOtherFunc = async () => { try { myFunc(); //... Some code } catch (error) { if (error.message === 'NO_PAGE') { // ...Perform some action; } console.log(error); } }; 

Answer 1

If you prefer to create custom errors, why don't you do so? https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error#Custom_Error_Types.

Unfortunately you can't catch specific errors in javascript like you're used to in java. So you still have to match something in an if statement.

catch (e) { if (e instanceof CustomError) 

At least this solution is nicer and less error prone than string matching on error message. Yet, I guess that's also pretty subjective.