如何在异步函数中引发异常？

Question

my use case is something like this,

1. First I get the image path and restaurant id from the front-end.
2. Then I check whether this restaurant has 5 images already. If yes I send and exception says "Sorry maxmimum number of images you can upload is 5."
3. I want to attach that error to my respond as well.

This is my code.

 export async function upload_images_to_restaurant(req, res, next) { try { const data = req.swagger.params.body.value; console.log("Data", data); const restaurant_id = data.restaurant_id; const count = await db.restaurant_images.count({ where: { restaurant_id: restaurant_id } }) if (count >= 5) { throw "Sorry maxmimum number of images you can upload is 5." } else { const upload = db.restaurant_images.create(data) } console.log("Count", count) res.sendStatus(200); } catch (error) { console.log("Errors", error); res.stauts(422).json(error) } } 

In the catch block console log it outputs the error.But after that it gives me an error

This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch().

I'm wondering why I'm getting this error since what I throw is correctly output in the catch block's console log .

Answer 1

Because there is a typo. You should write 'res.status(...' instead of 'res.stauts'. This exception is not handled by 'try... catch...' expression.