crawler.js

/*
    Usage:
    $ node crawler.js <url> <filename>
    Example:
    $ node crawler.js "https://jsonplaceholder.typicode.com/users" "users.json"
*/

const https = require('https');
const fs = require('fs');

const url = process.argv[2];
const filename = process.argv[3];

console.log("\x1b[32mRequest to: \x1b[37m" + url);
console.log("\x1b[32mSave to: \x1b[37m" + filename);

https.get(url, (res) => {
    let body = '';

    console.log("... loading");

    res.on('data', function(chunk){
        body += chunk;
    });

    res.on('end', function(){
        fs.writeFileSync(filename, body);
        console.log("\x1b[32m--Done--");
    });
});