I am getting Unhandled Promise Rejection error even though I have the catch section in my code

Question

I am just trying to handle the data from the post request. I am handling data in the catch section so as to log it in the console, but still, I am getting the error Unhandled Promise Rejection.

router.post('/', (req, res, next) => {
    const product = new Product({
        _id: new mongoose.Types.ObjectId(),
        name: req.body.name,
        price: req.body.price
    });
    product
        .save()
        .then(result => {
            console.log(result);
        });
        .catch(err => console.log(err));

    res.status(201).json({
        message: 'Handling post request to /products.',
        createdProduct: product
    });
});

Answer 1

Sometimes the db libraries do that. I had similar experience before. You can use global error handler and see what is going on.

process.on('unhandledRejection', function(reason, p){
   //call handler here
});

this might shed some more light to the issue.