How to avoid Node.Js app quit when there's a Javascript error?

Question

Suppose I have the following typo in my Node.Js app Javascript code:

    max_weight = Match.floor(max_weight/min_weight)

It's supposed to be Math.floor instead of Match.floor so when the code executes I get the error:

ReferenceError: Match is not defined

and then my Node.Js app quits.

How can I ensure that even if an error like this occurs, the app does not quit but simply reports the error and continues the code execution?

I understand I should solve problems like this before launching into production, but, still, what if I want the code to continue the execution despite the error?

Ghonima · Accepted Answer · 2020-02-16 11:07:05Z

2

By wrapping your code in a try catch block, you should be able to

try {
  max_weight = Match.floor(max_weight/min_weight);
}
catch(err) {
  // do something to log error
}

be aware that the lines inside the try block after where the error is found will not be executed.

answered Feb 16, 2020 at 11:07

Ghonima

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Comments

Zeeshan Hassan Memon · Accepted Answer · 2020-02-16 12:26:49Z

1

This could be achieved in two ways.

First approach is to use node.js global error handling way:

process.on('uncaughtException', function(err) {
  console.log(err); // do something with error or ignore it
});

let max_weight = 17, min_weight = 5;
max_weight = Match.floor(max_weight / min_weight);

Other approach is to handle it locally at code level:

try {
    // trying to do something that might fail should be inside try block
    let max_weight = 17, min_weight = 5;
    max_weight = Match.floor(max_weight/min_weight);
} catch(err) {
    console.log(err); // do something with error or ignore it
}

Clone node-cheat error-handling, run node error-handling.js.

edited Feb 16, 2020 at 12:26

answered Feb 16, 2020 at 11:32

Zeeshan Hassan Memon

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3 Comments

Aerodynamika Over a year ago

So does it mean that if I use the global handling it won’t quit anymore but will just do the console log ?

Manjeet Singh Over a year ago

One thing you should not do is to listen for the uncaughtException event, emitted read here

Zeeshan Hassan Memon Over a year ago

Above are possible options specific to what OP has asked, It is not clear yet whether OP is using express or koa or something else, otherwise response could be bit different.

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