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Node.js server.address() Method
  • Last Updated : 15 Sep, 2020

The server.address() is an inbuilt application programming interface of class Socket within tls module which is used to get the bound address of the server.

Syntax:

const server.address()

Parameters: This method does not accept any parameter.

Return Value: This method return the bound address containing the family name, and port of the server.

How to generate private key and public certificate?



  1. Private key: Open notepad and copy paste the following key:

    -----BEGIN RSA PRIVATE KEY-----
    MIICXQIBAAKBgQC38R9wXcUbhOd44FavgmE5R3K4JeYOHLnI7dUq1B8/Gv7l3SOg
    JKef/m9gM1KvUx951mapXGtcWgwB08J3vUE2YOZ4tWJArrVZES0BI/RmFAyhQFP5
    HcWl3LSM9LRihP98F33oIkKaCxA5LxOrkgpV4HrUzIKTABDYah7RPex1WQIDAQAB
    AoGBAIXR71xxa9gUfc5L7+TqBs+EMmrUb6Vusp8CoGXzQvRHMJCMrMFySV0131Nu
    o0YYRDsAh1nJefYLMNcXd1BjqI+qY8IeRsxaY+9CB2KKGVVDO2uLdurdC2ZdlWXT
    Vwr3dDoyR0trnXJMmH2ijTeO6bush8HuXxvxJBjvEllM5QYxAkEA3jwny9JP+RFu
    0rkqPBe/wi5pXpPl7PUtdNAGrh6S5958wUoR4f9bvwmTBv1nQzExKWu4EIp+7vjJ
    fBeRZhnBvQJBANPjjge8418PS9zAFyKlITq6cxmM4gOWeveQZwXVNvav0NH+OKdQ
    sZnnDiG26JWmnD/B8Audu97LcxjxcWI8Jc0CQEYA5PhLU229lA9EzI0JXhoozIBC
    TlcKFDuLm88VSmlHqDyqvF9YNOpEdc/p2rFLuZS2ndB4D+vu6mjwc5iZ3HECQCxy
    GBHRclQ3Ti9w76lpv+2kvI4IekRMZWDWnnWfwta+DGxwCgw2pfpleBZkWqdBepb5
    JFQbcxQJ0wvRYXo8qaUCQQCgTvWswBj6OTP7LTvBlU1teAN2Lnrk/N5AYHZIXW6m
    nUG9lYvH7DztWDTioXMrruPF7bdXfZOVJD8t0I4OUzvC
    -----END RSA PRIVATE KEY-----

    Save file as private-key.pem

  2. Public certificate: Open notepad and copy paste the following key:

    -----BEGIN CERTIFICATE-----
    MIICfzCCAegCCQDxxeXw914Y2DANBgkqhkiG9w0BAQsFADCBgzELMAkGA1UEBhMC
    SU4xEzARBgNVBAgMCldlc3RiZW5nYWwxEDAOBgNVBAcMB0tvbGthdGExFDASBgNV
    BAoMC1BhbmNvLCBJbmMuMRUwEwYDVQQDDAxSb2hpdCBQcmFzYWQxIDAeBgkqhkiG
    9w0BCQEWEXJvZm9mb2ZAZ21haWwuY29tMB4XDTIwMDkwOTA1NTExN1oXDTIwMTAw
    OTA1NTExN1owgYMxCzAJBgNVBAYTAklOMRMwEQYDVQQIDApXZXN0YmVuZ2FsMRAw
    DgYDVQQHDAdLb2xrYXRhMRQwEgYDVQQKDAtQYW5jbywgSW5jLjEVMBMGA1UEAwwM
    Um9oaXQgUHJhc2FkMSAwHgYJKoZIhvcNAQkBFhFyb2ZvZm9mQGdtYWlsLmNvbTCB
    nzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAt/EfcF3FG4TneOBWr4JhOUdyuCXm
    Dhy5yO3VKtQfPxr+5d0joCSnn/5vYDNSr1MfedZmqVxrXFoMAdPCd71BNmDmeLVi
    QK61WREtASP0ZhQMoUBT+R3Fpdy0jPS0YoT/fBd96CJCmgsQOS8Tq5IKVeB61MyC
    kwAQ2Goe0T3sdVkCAwEAATANBgkqhkiG9w0BAQsFAAOBgQATe6ixdAjoV7BSHgRX
    bXM2+IZLq8kq3s7ck0EZrRVhsivutcaZwDXRCCinB+OlPedbzXwNZGvVX0nwPYHG
    BfiXwdiuZeVJ88ni6Fm6RhoPtu2QF1UExfBvSXuMBgR+evp+e3QadNpGx6Ppl1aC
    hWF6W2H9+MAlU7yvtmCQQuZmfQ==
    -----END CERTIFICATE-----

    Save file as public-cert.pem

Example 1: Filename: index.js

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// Node.js program to demonstrate the
// server.address() method
  
var tls = require('tls'),
    fs = require('fs'),
  
// Port and host address for server    
PORT = 1337,
HOST = '127.0.0.1',
value = "";
   
// Private key and public certificate for acess
var options = {
  key: fs.readFileSync('private-key.pem'),
  cert: fs.readFileSync('public-cert.pem'),
  rejectUnauthorized: false
};
  
// Creating and intializing server
var server = tls.createServer(options, function(socket) {
  
  // Print the data that we received
  socket.on("data", function(data) {
      console.log('\nReceived: %s ',
      data.toString().replace(/(\n)/gm, ""));
  });
  
});
  
// Start listening on a specific port and address
server.listen(PORT, HOST, function() {
  console.log("I'm listening at %s, on port %s", HOST, PORT);
});
  
// When an error occurs, show it.
server.on("error", function(error) {
  
  console.error(error);
  // Close the connection after the error occurred.
  // server.destroy();
  
});
  
server.on("end", ()=>{
  server.end();
  // server.destroy();
})
  
// Creating and intializing client
var client = tls.connect(PORT, 
     HOST, options, function() {
  
  // Check if the authorization worked
  if (client.authorized) {
      console.log("Connection authorized by"
          + " a Certificate Authority.");
  } else {
      console.log("Connection not authorized: "
             + client.authorizationError)
  }
  
  // Send a friendly message
  client.write("Bound address : " + value);
  client.end();
});
  
// Getting the bound address 
// by using address method
value = client.address();
  
// console.log("Bound address : " + value)
  
client.on("close", function() {
  console.log("Connection closed");
});
  
// When an error occurs, show it.
client.on("error", function(error) {
  
  console.error(error);
  // Close the connection after the error occurred.
  client.destroy();
  
});

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Output:

I'm listening at 127.0.0.1, on port 1337
Connection not authorized: DEPTH_ZERO_SELF_SIGNED_CERT

Received: Bound address : [object Object]
Connection closed

Example 2: Filename: index.js

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// Node.js program to demonstrate the
// server.address() method
  
var tls = require('tls'),
    fs = require('fs'),
  
// Port and host address for server    
PORT = 1337,
HOST = '127.0.0.1';
   
// Private key and public certificate for acess
var options = {
  key: fs.readFileSync('private-key.pem'),
  cert: fs.readFileSync('public-cert.pem'),
  rejectUnauthorized: false
};
  
// Creating and intializing server
var server = tls.createServer(options, function(socket) {
  
  // Print the data that we received
  socket.on('data', function(data) {
      console.log('\nReceived: %s ',
      data.toString().replace(/(\n)/gm, ""));
  });
});
  
  
// Start listening on a specific port and address
server.listen(PORT, HOST, function() {
  console.log("I'm listening at %s, "
       + "on port %s", HOST, PORT);
});
  
// Creating and intializing client
var client = tls.connect(PORT,
     HOST, options, function() {
    
 // Getting the bound address 
 // by using address method
 const value = client.address();
 client.write("Bound address : " + value)
  
 client.end();
});

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Run the index.js file using the following command:

node index.js

Output:

I'm listening at 127.0.0.1, on port 1337

Received: Bound address : [object Object] 

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/tls.html#tls_server_address

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