The server.setSecureContext() is an inbuilt application programming interface of class Socket within tls module which is used to replace the secure context for the existing server.

Syntax:

server.setSecureContext(options)

Parameters: This method takes any of the possible properties from the tls.setSecureContext() options arguments.

Return Value: This method does not return anything.

How to generate a private key and public certificates?

Private key: Open Notepad and copy and paste the following key:

Save the file as a private key.pem

Public certificate: Open Notepad and copy and paste the following key:

Save the file as public-cert.pem

Example 1: Filename: index.js

javascript

// Node.js program to demonstrate the
// server.setSecureContext() method
 
const { Console } = require('console');
 
// Server.setSecureContext() API
const 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
const options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
    rejectUnauthorized: false
};
 
// Creating and initializing server
const 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, ""));
    });
 
    // Replacing secure context with the new one
    server.setSecureContext(options.cert);
    console.log("secure replaced sucssesfully");
 
    server.close();
});
 
// 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);
});
 
 
// Creating and initializing client
const 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("I am the client sending"
            + " you a message.");
        client.end();
    });
 
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();
});

Run the index.js file using the following command:

node index.js

Output:

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

Received: I am the client sending you a message.
Connection closed

Example 2: Filename: index.js

javascript

// Node.js program to demonstrate the
// server.setSecureContext() method
const 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
const options = {
    key: fs.readFileSync('private-key.pem'),
    cert: fs.readFileSync('public-cert.pem'),
    rejectUnauthorized: false
};
 
// Creating and initializing server
const 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, ""));
    });
 
    // Replacing secure context with the new one
    server.setSecureContext(options.cert);
    console.log("secure replaced successfully");
 
    server.close();
});
 
// 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 initializing client
const client = tls.connect(PORT, HOST, options, function () {
 
    // Send a friendly message
    client.write("I am the client sending you a message.");
    client.end();
});

Run the index.js file using the following command:

node index.js

Output:

I'm listening at 127.0.0.1, on port 1337
secure replaced successfully

Received: I am the client sending you a message.

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

Node.js server.setSecureContext() Method

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