Unable to thrown an error in Express Node - node.js

Question

I have a following Post route
router.post("/message", async (req, res) => {
const newMessage = new Message({
From: req.body.sendersPhoneNumber,
To: 9188123560,
OTP: req.body.randomNumber,
Message: req.body.TextToSend
})
newMessage.save().then((response) => {
const from = "NEXMO"
const to = response.To
const text = response.Message
nexmo.message.sendSms(from, to, text, {type: 'unicode'}, (error, responseData) => {
if (error) {
console.log(error)
throw new Error (error)
} else {
console.dir(responseData)
res.send(responseData)
}
})
})
})
In this, I want to throw an error If there is an error for which i did something like this
if (error) {
console.log(error)
throw new Error (error)
}
But that doesn't seem to be working, can some help me by sharing, how can we throw an error in nodeJs
This is my request from frontend
axios.post(test_url_base + "/contact/message", this.state).then(response => {

Answer 1

Solution 01:
Line 1: Need a third parameter, next to pass the error to the next handler.
Line 16: pass the error to the next error handler, return next(error);
NB: In your root file like index.js or server.js or whatever you are using, You need an error handler, like,
app.use((err, req, res, next) => {
console.log('Found a error');
});
Your final code will be,
router.post("/message", async (req, res, next) => {
const newMessage = new Message({
From: req.body.sendersPhoneNumber,
To: 9188123560,
OTP: req.body.randomNumber,
Message: req.body.TextToSend
})
newMessage.save().then((response) => {
const from = "NEXMO"
const to = response.To
const text = response.Message
nexmo.message.sendSms(from, to, text, {type: 'unicode'}, (error, responseData) => {
if (error) {
console.log(error)
return next(error);
} else {
console.dir(responseData)
res.send(responseData)
}
})
})
})
Solution 2:
If you encounter an error, pass the error to the client side,
Use res.status(400).send(error);
In this case, your code should be,
router.post("/message", async (req, res, next) => {
const newMessage = new Message({
From: req.body.sendersPhoneNumber,
To: 9188123560,
OTP: req.body.randomNumber,
Message: req.body.TextToSend
})
newMessage.save().then((response) => {
const from = "NEXMO"
const to = response.To
const text = response.Message
nexmo.message.sendSms(from, to, text, {type: 'unicode'}, (error, responseData) => {
if (error) {
console.log(error)
return res.send(error);
} else {
console.dir(responseData)
res.send(responseData)
}
})
})
})

Answer 2

as you have done that is also correct way but i don't get why it is not working.
you can also try this one
if (error) {
return next(error)
}
or you can also do this
res.render('error', { error: err })

Answer 3

Put try catch block , so that any error thrown from try block gets caught in catch block.
router.post("/message", async (req, res) => {
try {
const newMessage = new Message({
From: req.body.sendersPhoneNumber,
To: 9188123560,
OTP: req.body.randomNumber,
Message: req.body.TextToSend
})
newMessage.save().then((response) => {
const from = "NEXMO"
const to = response.To
const text = response.Message
nexmo.message.sendSms(from, to, text, { type: 'unicode' }, (error, responseData) => {
if (error) {
console.log(error)
throw new Error(error)
} else {
console.dir(responseData)
res.send(responseData)
}
})
});
}
catch (e) {
res.send({ status: 400, error: e });
}
})