Here is the main idea.

1. Get Input from the user(client-side) and send it to the server on submit.
2. In the server, scrape data from any external website (Suppose it will be the whole Html of the target URL).
3. Manipulate those data to get specific values using the user inputs.
4. Then send back specific data to the client-side and show it to the user.

I can scrape Html with the following Javascript code.

const request = require('request')
const cheerio = require('cheerio');


let options = {
    url: 'https://targetwebsite.com',
    headers: {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 Edg/93.0.961.47'
        
    }
};

request(options, function(err, resp, html) {
    if (!err) {
        console.log(html);
    }
})

Now I just needed to know how can I do the whole process.