Where to handle the error in a sequelize ORM query statement?
If you want to handle the specific error, attach a .catch handler
models.Item.create({ title : req.body.title, UserId : req.body.UserId}).then(function(item){ res.json({ "Message" : "Created item.", "Item" : item });}).catch(function (err) { // handle error;});If you want to handle errors more generally (i.e. show a nice error message, instead of killing your server, you might want to have a look at unhandledexception
https://nodejs.org/api/process.html#process_event_uncaughtexception
If you are using express, it also contains some error handling facilities http://expressjs.com/en/guide/error-handling.html
You can handle all ORM errors to return an HTTP 500 status and some default error message by doing something like below
router.use((error, request, response, next) => { response.status(error.status || 500).json({ status: 'error', error: { message: error.message || serverErrorMsg, }, });});The above code also allows you to throw errors with custom messages that will be sent to the client