NodeJS server loading Loop - node.js

Question

const http = require('http');
const fs = require('fs');
const requests = require('requests');
const homefile = fs.readFileSync("./home.html", 'utf-8');
const replaceVal = (tempVal, orgVal) => {
let temperature = tempVal.replace(`{%tempVal%}`, orgVal.main.temp);
return temperature;
}
const server = http.createServer((req, res) => {
if (req.url == '/') {
requests('https://api.openweathermap.org/data/2.5/weather?q=Pune&appid=4bebabe44d8d1f07b79b9bbc8ed9dd33')
.on('data', function (chunk) {
const objdata = JSON.parse(chunk);
const arrayDatda = [objdata];
console.log(arrayDatda);
const realtimeData = arrayDatda.map((val) => replaceVal(homefile, val)).join("")
// console.log(realtimeData)
res.write(realtimeData)
})
.on('end', function (err) {
if (err) {
console.log('connection closed due to errors', err);
}
res.end("working");
});
}
})
server.listen(80, '127.0.0.1');
Whenever I try to restart the server it just goes on loading loop and didn't show any results until I stop the loading

Answer 1

I tried running your code without the file replacement logic you've written and got this error.
_http_outgoing.js:679
throw new ERR_INVALID_ARG_TYPE('first argument',
^
TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer. Received an instance of Array
at write_ (_http_outgoing.js:679:11)
at ServerResponse.write (_http_outgoing.js:644:15)
You have to send a supported content-type to res.write.
const realtimeData = arrayDatda.map((val) => replaceVal(homefile, val)).join("")
realtimeData is an Array and is not supported.
const http = require('http');
const fs = require('fs');
const requests = require('requests');
// const homefile = fs.readFileSync("./home.html", 'utf-8');
// const replaceVal = (tempVal, orgVal) => {
// let temperature = tempVal.replace(`{%tempVal%}`, orgVal.main.temp);
// return temperature;
// }
const server = http.createServer((req, res) => {
if (req.url == '/') {
requests('https://api.openweathermap.org/data/2.5/weather?q=Pune&appid=4bebabe44d8d1f07b79b9bbc8ed9dd33')
.on('data', function (chunk) {
const objdata = JSON.parse(chunk);
const arrayDatda = [objdata];
console.log(arrayDatda);
// const realtimeData = arrayDatda.map((val) => replaceVal(homefile, val)).join("")
// console.log(realtimeData)
// converting arrayDatda to string and sending works
res.write(JSON.stringify(arrayDatda))
})
.on('end', function (err) {
if (err) {
console.log('connection closed due to errors', err);
}
res.end("working");
});
}
})
server.listen(8080, '127.0.0.1');
So after replacing your file with data that you've received from API, you have to serve that file in res.write, not the realtimeDatda variable which is an Array.
I suggest going through the basics of node http server again and learn about how to serve different content types and static files.
Here is a good beginner blog:
https://www.digitalocean.com/community/tutorials/how-to-create-a-web-server-in-node-js-with-the-http-module