NodeJs makes this task extremely simple using the net package. Of course there are port scanning packages available on npm that make this task much easier but I'm a developer and I like to write my own code.
Listing 1
var net = require('net');
async function scan(){
let host = "127.0.0.1";
let start = 80;
let stop = 65000;
for(let port = start; port <= stop; port++){
try{
await connect(host, port);
console.log(`Port ${port} open`);
}catch(e){
// Do nothing
}
}
console.log('Scan complete');
}
async function connect(host, port){
return new Promise((res, rej) => {
net.connect({host : host, port: port}, () => {
res(true);
}).on("error", err => {
rej(err);
});
});
}
scan();
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