[Node] Catch error for async await

Posted 2020-09-23 Answer1215

When we try to do MongoDB opration, mongoose return Promise, we can use async/await to simply the code:

const mongoose = require(‘mongoose‘);
const Store = mongoose.model(‘Store‘);

exports.createStore = async (req, res) => {
    const store = new Store(req.body);
    await store.save();
    res.redirect(‘/‘);
};

 

The problme here is no error handling, we can use try catch, there is another approach is function composion.

We can define a high order function:

exports.catchErrors = (fn) => {
  return function(req, res, next) {
    return fn(req, res, next).catch(next);
  };
};

 

We just need to wrap express router:

router.post(‘/add‘, catchErrors(storeCtrl.createStore));

 

So the following middlewares can handle those error later.