chriswitko · January 17, 2022 10:50 · Feb 21, 2021 · Feb 21, 2021 · Nov 19, 2019 · Nov 19, 2019
diff --git a/_Full-socketio-client-and-server-example.md b/_Full-socketio-client-and-server-example.md
@@ -17,8 +17,8 @@ Create a folder, run `npm init -f` on it and paste both `server.js` and `client.
 
 Install the required libraries:
 
-    npm install socket.io
-    npm install socket.io-client
+    npm install socket.io@3.1.1
+    npm install socket.io-client@3.1.1
 
 Run the server:
 

diff --git a/_Full-socketio-client-and-server-example.md b/_Full-socketio-client-and-server-example.md
@@ -1,5 +1,7 @@
 # Full socket.io client and server example
 
+*Last updated: 2021-02-21, tested with socket.io v3.1.1*
+
 This is the simplest implementation you will find for a client/server WebSockets architecture using socket.io.
 
 To see a full explanation, read my answer on SO here: https://stackoverflow.com/a/24232050/778272.

diff --git a/server.js b/server.js
@@ -1,7 +1,7 @@
 
 const
-    io = require("socket.io"),
-    server = io.listen(8000);
+    {Server} = require("socket.io"),
+    server = new Server(8000);
 
 let
     sequenceNumberByClient = new Map();

diff --git a/_Full-socketio-client-and-server-example.md b/_Full-socketio-client-and-server-example.md
@@ -1,6 +1,6 @@
 # Full socket.io client and server example
 
-This is the most keep-it-simple implementation you will find for a client-server web sockets architecture using socket.io.
+This is the simplest implementation you will find for a client/server WebSockets architecture using socket.io.
 
 To see a full explanation, read my answer on SO here: https://stackoverflow.com/a/24232050/778272.
 

diff --git a/_Full-socketio-client-and-server-example.md b/_Full-socketio-client-and-server-example.md
@@ -1,8 +1,15 @@
 # Full socket.io client and server example
 
+This is the most keep-it-simple implementation you will find for a client-server web sockets architecture using socket.io.
+
 To see a full explanation, read my answer on SO here: https://stackoverflow.com/a/24232050/778272.
 
-## How to use
+If you're looking for examples using frameworks, check these links:
+
+- [socket.io + Express](https://github.com/luciopaiva/socketio-with-express)
+- [socket.io + Restify](https://github.com/luciopaiva/socketio-with-restify)
+
+## How to run
 
 Create a folder, run `npm init -f` on it and paste both `server.js` and `client.js` there (see files below). Needless to say, you must have Node.js installed on your system.
 

diff --git a/Full socket.io client and server example.md → _Full-socketio-client-and-server-example.md b/Full socket.io client and server example.md → _Full-socketio-client-and-server-example.md
diff --git a/README.md → Full socket.io client and server example.md b/README.md → Full socket.io client and server example.md
diff --git a/README.md b/README.md
@@ -1,6 +1,8 @@
-To see a full exaplanation, read my answer on SO here: https://stackoverflow.com/a/24232050/778272.
+# Full socket.io client and server example
 
-# How to use
+To see a full explanation, read my answer on SO here: https://stackoverflow.com/a/24232050/778272.
+
+## How to use
 
 Create a folder, run `npm init -f` on it and paste both `server.js` and `client.js` there (see files below). Needless to say, you must have Node.js installed on your system.
 

diff --git a/README.md b/README.md
@@ -0,0 +1,18 @@
+To see a full exaplanation, read my answer on SO here: https://stackoverflow.com/a/24232050/778272.
+
+# How to use
+
+Create a folder, run `npm init -f` on it and paste both `server.js` and `client.js` there (see files below). Needless to say, you must have Node.js installed on your system.
+
+Install the required libraries:
+
+    npm install socket.io
+    npm install socket.io-client
+
+Run the server:
+
+    node server
+
+Open other terminal windows and spawn as many clients as you want by running:
+
+    node client
diff --git a/client.js b/client.js
@@ -0,0 +1,6 @@
+
+const
+    io = require("socket.io-client"),
+    ioClient = io.connect("http://localhost:8000");
+
+ioClient.on("seq-num", (msg) => console.info(msg));
diff --git a/server.js b/server.js
@@ -0,0 +1,28 @@
+
+const
+    io = require("socket.io"),
+    server = io.listen(8000);
+
+let
+    sequenceNumberByClient = new Map();
+
+// event fired every time a new client connects:
+server.on("connection", (socket) => {
+    console.info(`Client connected [id=${socket.id}]`);
+    // initialize this client's sequence number
+    sequenceNumberByClient.set(socket, 1);
+
+    // when socket disconnects, remove it from the list:
+    socket.on("disconnect", () => {
+        sequenceNumberByClient.delete(socket);
+        console.info(`Client gone [id=${socket.id}]`);
+    });
+});
+
+// sends each client its current sequence number
+setInterval(() => {
+    for (const [client, sequenceNumber] of sequenceNumberByClient.entries()) {
+        client.emit("seq-num", sequenceNumber);
+        sequenceNumberByClient.set(client, sequenceNumber + 1);
+    }
+}, 1000);
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