catch exception when throw error using nodejs

Question

I want to build api resful, and I want to catch error when I throw error, but it is not working

controller.js

Article.findOne({_id: my_id}, function(err, article){

if(article === null){
   throw Error('Article is not found');
}else{
   res.status(200).json(article);
}

});

When my_id is not in database, I cant not catch error and response json app.js

app.use(function(err, req, res, next) {
    res.status(200).json({
        'status' : 500,
        'messages' : err
    });

});

How are you catching the exception?? Simple try.. catch works in js. — Ravi
– Ravi, Commented Dec 29, 2014 at 11:37

Vsevolod Goloviznin · Accepted Answer · 2014-12-29 11:24:12Z

2

You don't need to throw an error as it halts the execution of the whole script.

With express you can just pass the error to the next function and you error catcher will work.

router.get('/', function(req, res, next) {
    Article.findOne({_id: my_id}, function(err, article) {
        if(article === null){
           var error = Error('Article is not found');
           next(error);
        }else{
           res.status(200).json(article);
        }
    });
});

answered Dec 29, 2014 at 11:24

Vsevolod Goloviznin

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