How to stop API GET request once data is fetched successfully - node.js

Question

My question is strictly related to MEAN stack. I want to fetch the total count of documents stored in my MongoDB databse. My express server is working fine but on postman I can see still it is still making request even though i got correct count on console:
Here is my code:
api.js
const uri = 'mongodb://tanzee.......ue&w=majority'
const { MongoClient } = require("mongodb");
const client = new MongoClient(uri);
router.get('/totalmovies', function(req, res) {
run().catch(console.dir);
});
async function run() {
try {
await client.connect();
const database = client.db("mycollection");
const movies = database.collection("movies");
const estimate = await movies.estimatedDocumentCount();
console.log(`Estimated number of documents in the movies collection: ${estimate}`);
} finally {
await client.close();
}
}
I took help from the official doc of mongodb: https://docs.mongodb.com/drivers/node/usage-examples/count/
Output:
(node:15511) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
Estimated number of documents in the movies collection: 80
I'm new to this stack. Once the output is fetched, my code should stop the GET call immediately. Please point out my mistakes.

Answer 1

Your code is correct, the request is pending as you are not sending any response thats why the requester is still waiting to receive one. A simple fix is to send data back to the requester.
router.get('/totalmovies', async function(req, res) {
const result = await run();
// check how are you getting result when it is a success/failure
// apply condition same in the below if/else
// it just for reference, it might be correct though
if (result > 0) {
res.status(200).send(result);
} else {
res.status(404).send({'No Data in DB'});
}
});
(node:15511) DeprecationWarning: current URL string parser is
deprecated, and will be removed in a future version. To use the new
parser, pass option { useNewUrlParser: true } to MongoClient.connect.
for this to work:
const client = new MongoClient(uri, { useNewUrlParser: true })
Don't close and rebuild the connection for every request:
async function run() {
try {
await client.connect();
const database = client.db("mycollection");
const movies = database.collection("movies");
const estimate = await movies.estimatedDocumentCount();
console.log(`Estimated number of documents in the movies collection: ${estimate}`);
return estimate;
} catch (e){
console.error('Error in fetching the data from DB')
}
}