I created a app.js file and there I am trying to connect with mongoDB atlas. The error 'UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with.catch()' is throwing when I run in terminal.
const connect = async function () {
const MongoClient = require('mongodb').MongoClient;
const uri = "mymongoDB atals url for nodejs";
MongoClient.connect(uri, { useNewUrlParser: true });
const collection = client.db("feedback").collection("itinerary");
// perform actions on the collection object
client.close();
};
connect().then(() => {
console.log('handle success here');
}).catch((exception) => {
console.log('handle error here: ', exception)
})
Try putting the async function operations in try catch block as below. I hope this should do the work.
const connect = async function () {
try {
const MongoClient = require('mongodb').MongoClient;
const uri = "mymongoDB atals url for nodejs";
MongoClient.connect(uri, { useNewUrlParser: true });
const collection = client.db("feedback").collection("itinerary");
// perform actions on the collection object
client.close();
} catch (e) {
console.log("Error", e)
}
};
connect().then(() => {
console.log('handle success here');
}).catch((exception) => {
console.log('handle error here: ', exception)
})
Try this:
const MongoClient = require('mongodb').MongoClient;
const connect = function () {
return new Promise((resolve, reject) => {
try {
const uri = "mymongoDB atals url for nodejs";
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect(err => {
if (err) {
reject(err)
}
const collection = client.db("feedback").collection("itinerary");
client.close();
resolve();
});
} catch (e) {
reject(e);
}
})
};
connect().then(() => {
console.log('handle success here');
}).catch((exception) => {
console.log('handle error here: ', exception)
})
Try this approach:
const MongoClient = require('mongodb').MongoClient;
// replace the uri string with your connection string.
const uri = "mymongoDB atals url for nodejs"
MongoClient.connect(uri, function(err, client) {
if(err) {
console.log('handle error here: ');
}
console.log('handle success here');
const collection = client.db("feedback").collection("itinerary");
// perform actions on the collection object
client.close();
});
Try by wrapping all the content of your function in a try
/ catch
block:
const connect = async function () {
try {
const MongoClient = require('mongodb').MongoClient;
const uri = "mymongoDB atals url for nodejs";
MongoClient.connect(uri, { useNewUrlParser: true });
// most probably this is throwing the error. Notice the extra await
const collection = await client.db("feedback").collection("itinerary");
// perform actions on the collection object
client.close();
} catch (e) {
console.log(`Caught error`,e)
}
};
connect().then(() => {
console.log('handle success here');
}).catch((exception) => {
console.log('handle error here: ', exception)
})
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