how to handle error using async in nodeJS?

Question

I am cleaning my code and moving from callback hell to async/await and try/catch but I still want to make my code DRY as I have too many routes and performing same try catch in every request. What could be the best way to handle this?

this my example code in one of the GET route.

router.get('/customer', async (req, res, next) => {
    try {
        const customer = await Customer.find({}).populate('buisness').exec();
        return res.status(200).json({
            result: customer
        });
    } catch (e) {
        return next(e);
    }
});

now if I repeat same thing on every route it is not following DRY code. what could be the best?

Ron Nagar · Accepted Answer · 2019-11-06 15:54:21Z

5

const errorHandlerMiddleware = async (req, res, next) =>  {
  try {
    await next();
  } catch (err) {
    // handle the error here
  }
};
router.use(errorHandlerMiddleware);

router.get('/customer', async (req, res, next) => {
  const customer = await Customer.find({}).populate('buisness').exec();
  return res.status(200).json({
    result: customer
  });
});

use errorHandlerMiddleware before all your routes, this middleware will catch every exception that is thrown from your routes. now every time there is an exception in your route it will be caught in the middleware

edited Nov 6, 2019 at 15:54

answered Nov 6, 2019 at 15:28

Ron Nagar

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