data fatching form api to html in node - node.js

Question

I was learn create wather app by using node.js form youtube and i just copy the code that he was writing but there code is work properly and my code dose not work
in my code I don't understand this line and after type this line my code is give arror before this every thing is right
const rtd = adata.map((val) => replaceVal(index, val)).join(" ");
res.write(rtd);
the code in this image is written by me and this code is note work
const fs = require('fs');
const http = require('http');
var requests = require('requests');
const replaceVal = (tempval, orgVal) => {
let temperature = tempval.replace('{% tempval %}', orgVal.current.temp_c);
temperature = temperature.replace('{% location %}', orgVal.location.region);
temperature = temperature.replace('{% country %}', orgVal.location.country);
return temperature;
}
const index = fs.readFileSync('index.html', 'utf-8');
const server = http.createServer((req, res) => {
if (req.url == '/') {
requests('https://api.weatherapi.com/v1/current.json?key=fbffa2e936464bd292b70117221308&q=india&aqi=no')
.on('data', (chunk) => {
const jdata = JSON.parse(chunk);
const adata = [jdata];
// console.log(adata)
// console.log(adata[0].current.temp_c)
const rtd = adata.map((val) => replaceVal(index, val)).join(" ");
res.write(rtd);
})
.on('end', function (err) {
if (err) return console.log('connection closed due to errors', err);
res.end();
// console.log('')
});
}
})
server.listen(8000, "127.0.0.1");
this is screen shot of the video