Node.js - Try Catch Error Not Being Returned

Question

i have written a node.js api using the express framework. I am using await and async. I catch the asynchronous function in a try catch block. However in the catch(err) method the err is not being returned.

try {

            const job = await this.jobRepository.functionDoesNotExist();

            if (job.success === false) {
                return res.status(404).json({
                    success: false,
                    status: 404,
                    data: job,
                    message: "Failed to retrieve job"
                });
            }

            return res.status(200).json({
                success: true,
                status: 200,
                data: job.data,
                message: "Successfully retrieved job"
            });

        } catch (err) {

            return res.status(500).json({
                success: false,
                status: 500,
                data: err,
                message: "The server threw an unxpected errror"
            });

        }

In the above example i am deliberately calling a function that does not exist so that it throws an error.

The response i get is below. It is hitting the catch block, but the error is not being added to the data object.

{
    "success": false,
    "status": 500,
    "data": {},
    "message": "The server threw an unxpected errror"
}

However, if i move the below line out of the try catch block. The console will throw the following error.

    const job = await this.jobRepository.functionDoesNotExist();

"error":{},"level":"error","message":"uncaughtException: this.jobRepository.functionDoesNotExist is not a function\nTypeError: this.jobRepository.functionDoesNotExist is not a function\n    at JobController.<anonymous>

So my question is, why is this error not being displayed in the response when the call is made within the try catch block.

Anand Undavia · Accepted Answer · 2018-08-24 10:27:26Z

3

By default, The error object is not JSON.stringify()-able. Read Here

To get the stack trace however, you can use err.stack like so:

    return res.status(500).json({
        success: false,
        status: 500,
        data: err.stack,
        message: "The server threw an unxpected errror"
    });

edited Aug 24, 2018 at 10:27

answered Aug 24, 2018 at 9:44

Anand Undavia

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