Node.js tls.DEFAULT_MAX_VERSION Method

The tls.DEFAULT_MAX_VERSION is an inbuilt application programming interface of class TLS within tls module which is used to return the default value of the maxVersion option of tls.DEFAULT_MAX_VERSION().

Syntax:

const tls.DEFAULT_MAX_VERSION

Parameters: This method does not accept any parameter.

Return Value: This method returns the default value of the maxVersion option of tls.DEFAULT_MAX_VERSION().

How to generate the 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-----
   

   Now save the 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-----
   

   Now save the file as public-cert.pem

Example 1: Filename: index.js

// Node.js program to demonstrate the
// tls.DEFAULT_MAX_VERSION method

var tls = require('tls'),
    fs = require('fs'),

    // Port and host address for server
    PORT = 1337,
    HOST = '127.0.0.1',
    value = null;

// Private key and public certificate
// for access
var options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
    rejectUnauthorized: false
};

// Creating and initializing 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, ""));
        });

        // Stopping the server
        // by using the close() method
        server.close(() => {
            console.log("Server closed successfully");
        });
    });

// Start listening on a specific port and
// address by using listen() method
server.listen(PORT, HOST, function () {
    console.log("I'm listening at %s, on "
        + "port %s", HOST, PORT);
});

// Creating and initializing client
var client = tls.connect(PORT, HOST,
    options, function () {

        // Getting max version by using
        // tls.DEFAULT_MAX_VERSION method
        value = tls.DEFAULT_MAX_VERSION;

        client.write(" max version : " + value);

        client.end(() => {
            console.log("Client closed successfully");
        });
    });

Run the index.js file using the following command:

node index.js

Output:

I'm listening at 127.0.0.1, on port 1337
Client closed successfully

Received:  max version : TLSv1.3
Server closed successfully

Example 2: Filename: index.js

// Node.js program to demonstrate the
// tls.DEFAULT_MAX_VERSION 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 access
var options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
    rejectUnauthorized: false
};

// Creating and initializing server
var server = tls.createServer(options,
    function (socket) {

        // Getting max version by using
        // tls.DEFAULT_MAX_VERSION method
        value = tls.DEFAULT_MAX_VERSION;

        socket.write(" max version : " + value);

        // Stopping the server
        // by using the close() method
        server.close(() => {
            console.log("Server closed successfully")
        });
    });

// Start listening on a specific port and address
// by using listen() method
server.listen(PORT, HOST, function () {
    console.log(
        "I'm listening at %s, on port %s",
        HOST, PORT);
});

// Creating and initializing client
var client = tls.connect(PORT, HOST,
    options, function () {
        console.log("client is connected");
    });

client.on("data", function (data) {

    console.log('Received: %s',
        data.toString().replace(/(\n)/gm, ""));

    // Close the connection after
    // receiving the message
    client.end(() => {
        console.log("client closed successfully")
    });
});

Run the index.js file using the following command:

node index.js

Output:

I'm listening at 127.0.0.1, on port 1337
client is connected
Received:  max version : TLSv1.3
client closed successfully
Server closed successfully

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