Mongoose: how to catch MongoError error caused by async callback

[Ádám Kecskés]

When I'm trying to push too large data into `mongoDb` I'm getting this error: `MongoError: document is larger than the maximum size 16777216`

I know, it is normal, but I can not catch this error, and my `node.js` process exits.

Can you tell me, how to catch this error?

example 1: can not catch the error, `node` process exits

   

var mongoose = require('mongoose');
    mongoose.connect('mongodb://localhost/test');
   
    mongoose.connection.on('error', function (err) {
        console.log(err);
    });
   
    var Cat = mongoose.model('Cat', {name: Object});
   
   
    setTimeout(function () {
        var kitty = new Cat({
            name: {
                value: 'Zildjian',
                data: (new Array(16 * 1024 * 1024)).join("x")
            }
        });
   
        kitty.save(function (err) {
            if (err) // ...
                console.log('meow');
        });
   
    }, 1000);

Without the timeout I can catch the error:

example 2: error is caught, process doesn't exit

 

   var mongoose = require('mongoose');
    mongoose.connect('mongodb://localhost/test');
   
    mongoose.connection.on('error', function (err) {
        console.log(err);
    });
   
    var Cat = mongoose.model('Cat', {name: Object});
   
   
    var kitty = new Cat({
        name: {
            value: 'Zildjian',
            data: (new Array(16 * 1024 * 1024)).join("x")
        }
    });
   
    kitty.save(function (err) {
        if (err) // ...
            console.log('meow');
    });

I've tried to wrap my code into a `try...catch` but that doesn't caught the error either.

[Valeri Karpov]

Thanks for reporting this issue on github, this was fixed in 4.4.7: https://github.com/Automattic/mongoose/blob/master/History.md#447--2016-03-11