res write prints html tags as text in express

1const express = require("express");
2const https = require("https");
3const app = express();
4
5const url =
6  "https://api.openweathermap.org/data/2.5/weather?q=London,uk&units=metric&appid=0333cb6bfed722ca09f1062ec1ea9ca1";
7app.get("/", (req, res) => {
8  https.get(url, response => {
9    response.on("data", data => {
10      const weatherData = JSON.parse(data);
11      const temp = weatherData.main.temp;
12      const { description, icon } = weatherData.weather[0];
13      const imageURL = `http://openweathermap.org/img/wn/${icon}@2x.png`;
14
15      res.set("Content-Type", "text/html");
16      //OR
17      res.setHeader("Content-Type", "text/html");
18
19      res.send(`
20      <h3>The weather is currently ${description}</h3>
21      <img src="${imageURL}">
22      <h1>The temperature in London is <span>${temp}</span> ° Celsius.</h1>
23      `);
24    });
25  });
26  //res.send('server is up!!!');
27});
28
29app.listen(3000, () => {
30  console.log("Server started!!!");
31});
32