is there a mongoose connect error callback

Question

how can i set a callback for the error handling if mongoose isn\'t able to connect to my DB?

i know of

connection.on(\'open\', function () { ... });
         


        

Answer 1

As we can see on the mongoose documentation for Error Handling, since the connect() method returns a Promise, the promise catch is the option to use with a mongoose connection.

So, to handle initial connection errors, you should use .catch() or try/catch with async/await.

In this way, we have two options:

Using the .catch() method:

mongoose.connect('mongodb://localhost:27017/test', { useNewUrlParser: true })
.catch(error => console.error(error));

or using try/catch:

try {
    await mongoose.connect('mongodb://localhost:27017/test', { useNewUrlParser: true });
} catch (error) {
    console.error(error);
}

IMHO, I think that using catch is a cleaner way.