SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

HOW IT WORKS

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

PRIVATE MESSAGING

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

HOW IT WORKS

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

PRIVATE MESSAGING

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit

SOCKET.IO

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

CLIENT INSTALLATION

The client can also be run from Node.js. Note: for the reasons cited above, you may want to exclude debug from your browser bundle. With webpack, you can use webpack-remove-debug.. Note for TypeScript users: the types are now included in the socket.io-client package and thus the types from @types/socket.io-client are not needed anymore and may in fact cause errors: SERVER API | SOCKET.IO Socket. A Socket is the fundamental class for interacting with browser clients. A Socket belongs to a certain Namespace (by default /) and uses an underlying Client to communicate.. It should be noted the Socket doesn’t relate directly to the actual underlying TCP/IP socket and it is only the name of the class.. Within each Namespace, you can also define arbitrary channels (called room) that THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

ROOMS | SOCKET.IO

In that case, every socket in the room excluding the sender will get the event.. To leave a channel you call leave in the same fashion as join.. Default room. Each Socket in Socket.IO is identified by a random, unguessable, unique identifier Socket#id.For your convenience, each socket automatically joins a room identified by its own id.

FAQ | SOCKET.IO

Can I use wildcards in events?Not in Socket.IO directly, but check out this plugin by Hao-kang Den. It provides a Socket.IO middleware to deal with wildcards. Prevent flooding from single connection?L

SOCKET.IO 3 RELEASE

We are happy to announce the release of Socket.IO v3! Migration guideThis release contains a few non backward compatible changes. We have published a dedicated migration guide with all necessary detai NATIVE SOCKET.IO AND ANDROID Native Socket.IO and Android. 20 January 2015 — Naoyuki Kanezawa. In this tutorial well learn how to create a chat client that communicates with a Socket.IO Node.JS chat server, with our native Android Client! If you want to jump straight to the code, it’s on GitHub. Otherwise,

read on!

SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

HOW IT WORKS

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

PRIVATE MESSAGING

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

HOW IT WORKS

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

PRIVATE MESSAGING

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit

SOCKET.IO

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

CLIENT INSTALLATION

The client can also be run from Node.js. Note: for the reasons cited above, you may want to exclude debug from your browser bundle. With webpack, you can use webpack-remove-debug.. Note for TypeScript users: the types are now included in the socket.io-client package and thus the types from @types/socket.io-client are not needed anymore and may in fact cause errors: SERVER API | SOCKET.IO Socket. A Socket is the fundamental class for interacting with browser clients. A Socket belongs to a certain Namespace (by default /) and uses an underlying Client to communicate.. It should be noted the Socket doesn’t relate directly to the actual underlying TCP/IP socket and it is only the name of the class.. Within each Namespace, you can also define arbitrary channels (called room) that THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

ROOMS | SOCKET.IO

In that case, every socket in the room excluding the sender will get the event.. To leave a channel you call leave in the same fashion as join.. Default room. Each Socket in Socket.IO is identified by a random, unguessable, unique identifier Socket#id.For your convenience, each socket automatically joins a room identified by its own id.

FAQ | SOCKET.IO

Can I use wildcards in events?Not in Socket.IO directly, but check out this plugin by Hao-kang Den. It provides a Socket.IO middleware to deal with wildcards. Prevent flooding from single connection?L

SOCKET.IO 3 RELEASE

We are happy to announce the release of Socket.IO v3! Migration guideThis release contains a few non backward compatible changes. We have published a dedicated migration guide with all necessary detai NATIVE SOCKET.IO AND ANDROID Native Socket.IO and Android. 20 January 2015 — Naoyuki Kanezawa. In this tutorial well learn how to create a chat client that communicates with a Socket.IO Node.JS chat server, with our native Android Client! If you want to jump straight to the code, it’s on GitHub. Otherwise,

read on!

SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

HOW IT WORKS

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

PRIVATE MESSAGING

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

HOW IT WORKS

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

PRIVATE MESSAGING

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit

SOCKET.IO

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

CLIENT INSTALLATION

The client can also be run from Node.js. Note: for the reasons cited above, you may want to exclude debug from your browser bundle. With webpack, you can use webpack-remove-debug.. Note for TypeScript users: the types are now included in the socket.io-client package and thus the types from @types/socket.io-client are not needed anymore and may in fact cause errors: SERVER API | SOCKET.IO Socket. A Socket is the fundamental class for interacting with browser clients. A Socket belongs to a certain Namespace (by default /) and uses an underlying Client to communicate.. It should be noted the Socket doesn’t relate directly to the actual underlying TCP/IP socket and it is only the name of the class.. Within each Namespace, you can also define arbitrary channels (called room) that THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection

ROOMS | SOCKET.IO

In that case, every socket in the room excluding the sender will get the event.. To leave a channel you call leave in the same fashion as join.. Default room. Each Socket in Socket.IO is identified by a random, unguessable, unique identifier Socket#id.For your convenience, each socket automatically joins a room identified by its own id. CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

FAQ | SOCKET.IO

Can I use wildcards in events?Not in Socket.IO directly, but check out this plugin by Hao-kang Den. It provides a Socket.IO middleware to deal with wildcards. Prevent flooding from single connection?L

SOCKET.IO 3 RELEASE

We are happy to announce the release of Socket.IO v3! Migration guideThis release contains a few non backward compatible changes. We have published a dedicated migration guide with all necessary detai NATIVE SOCKET.IO AND ANDROID Native Socket.IO and Android. 20 January 2015 — Naoyuki Kanezawa. In this tutorial well learn how to create a chat client that communicates with a Socket.IO Node.JS chat server, with our native Android Client! If you want to jump straight to the code, it’s on GitHub. Otherwise,

read on!

SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

HOW IT WORKS

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

PRIVATE MESSAGING

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

HOW IT WORKS

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

PRIVATE MESSAGING

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit

SOCKET.IO

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

CLIENT INSTALLATION

The client can also be run from Node.js. Note: for the reasons cited above, you may want to exclude debug from your browser bundle. With webpack, you can use webpack-remove-debug.. Note for TypeScript users: the types are now included in the socket.io-client package and thus the types from @types/socket.io-client are not needed anymore and may in fact cause errors: SERVER API | SOCKET.IO Socket. A Socket is the fundamental class for interacting with browser clients. A Socket belongs to a certain Namespace (by default /) and uses an underlying Client to communicate.. It should be noted the Socket doesn’t relate directly to the actual underlying TCP/IP socket and it is only the name of the class.. Within each Namespace, you can also define arbitrary channels (called room) that THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection

ROOMS | SOCKET.IO

In that case, every socket in the room excluding the sender will get the event.. To leave a channel you call leave in the same fashion as join.. Default room. Each Socket in Socket.IO is identified by a random, unguessable, unique identifier Socket#id.For your convenience, each socket automatically joins a room identified by its own id. CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

FAQ | SOCKET.IO

Can I use wildcards in events?Not in Socket.IO directly, but check out this plugin by Hao-kang Den. It provides a Socket.IO middleware to deal with wildcards. Prevent flooding from single connection?L

SOCKET.IO 3 RELEASE

We are happy to announce the release of Socket.IO v3! Migration guideThis release contains a few non backward compatible changes. We have published a dedicated migration guide with all necessary detai NATIVE SOCKET.IO AND ANDROID Native Socket.IO and Android. 20 January 2015 — Naoyuki Kanezawa. In this tutorial well learn how to create a chat client that communicates with a Socket.IO Node.JS chat server, with our native Android Client! If you want to jump straight to the code, it’s on GitHub. Otherwise,

read on!

SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

GET STARTED

Support Socket.IO; Get started CHOOSE YOUR OWN ADVENTURE! Write a simple chat application; Recommended for beginners to Socket.IO or Node.js. The “Hello world!” of the framework is here.. A basic CRUD project; Let’s create a classic CRUD (Create-Read-Update-Delete) application with Socket.IO.We’ll introduce acknowledgements and the ability to broadcast events.

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

HOW IT WORKS

THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection LOGGING AND DEBUGGING Removing debug from your browser bundle. While useful during development, the debug package adds an extra weight to the final bundle (about 4KB minified and gzipped), that’s why it is excluded from the slim bundle (more details about the various browser bundles can be found here).. If you are using webpack, you can remove it with webpack-remove-debug:

CLIENT INSTALLATION

SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

GET STARTED

Support Socket.IO; Get started CHOOSE YOUR OWN ADVENTURE! Write a simple chat application; Recommended for beginners to Socket.IO or Node.js. The “Hello world!” of the framework is here.. A basic CRUD project; Let’s create a classic CRUD (Create-Read-Update-Delete) application with Socket.IO.We’ll introduce acknowledgements and the ability to broadcast events.

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

HOW IT WORKS

THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection LOGGING AND DEBUGGING Removing debug from your browser bundle. While useful during development, the debug package adds an extra weight to the final bundle (about 4KB minified and gzipped), that’s why it is excluded from the slim bundle (more details about the various browser bundles can be found here).. If you are using webpack, you can remove it with webpack-remove-debug:

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit

PRIVATE MESSAGING

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source | SERVER API | SOCKET.IO Socket. A Socket is the fundamental class for interacting with browser clients. A Socket belongs to a certain Namespace (by default /) and uses an underlying Client to communicate.. It should be noted the Socket doesn’t relate directly to the actual underlying TCP/IP socket and it is only the name of the class.. Within each Namespace, you can also define arbitrary channels (called room) that THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection

CLIENT INSTALLATION

The client can also be run from Node.js. Note: for the reasons cited above, you may want to exclude debug from your browser bundle. With webpack, you can use webpack-remove-debug.. Note for TypeScript users: the types are now included in the socket.io-client package and thus the types from @types/socket.io-client are not needed anymore and may in fact cause errors: CLIENT API | SOCKET.IO io.protocol (Number) The protocol revision number (currently: 5). The protocol defines the format of the packets exchanged between the client and the server.

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

FAQ | SOCKET.IO

Can I use wildcards in events?Not in Socket.IO directly, but check out this plugin by Hao-kang Den. It provides a Socket.IO middleware to deal with wildcards. Prevent flooding from single connection?L

EMITTING EVENTS

There are several ways to send events between the server and the client. Basic emitThe Socket.IO API is inspired from the Node.js EventEmitter, which means you can emit events on one side and register USING MULTIPLE NODES When deploying multiple Socket.IO servers, there are two things to take care of: enabling sticky session, if HTTP long-polling is enabled (which is the default): see below using the Redis adapter (or

CHAT | SOCKET.IO

Caught a mistake? Edit this page on GitHubGitHub SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

GET STARTED

Support Socket.IO; Get started CHOOSE YOUR OWN ADVENTURE! Write a simple chat application; Recommended for beginners to Socket.IO or Node.js. The “Hello world!” of the framework is here.. A basic CRUD project; Let’s create a classic CRUD (Create-Read-Update-Delete) application with Socket.IO.We’ll introduce acknowledgements and the ability to broadcast events.

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

HOW IT WORKS

THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection LOGGING AND DEBUGGING Removing debug from your browser bundle. While useful during development, the debug package adds an extra weight to the final bundle (about 4KB minified and gzipped), that’s why it is excluded from the slim bundle (more details about the various browser bundles can be found here).. If you are using webpack, you can remove it with webpack-remove-debug:

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit

PRIVATE MESSAGING

SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

GET STARTED

Support Socket.IO; Get started CHOOSE YOUR OWN ADVENTURE! Write a simple chat application; Recommended for beginners to Socket.IO or Node.js. The “Hello world!” of the framework is here.. A basic CRUD project; Let’s create a classic CRUD (Create-Read-Update-Delete) application with Socket.IO.We’ll introduce acknowledgements and the ability to broadcast events.

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

HOW IT WORKS

THE SOCKET INSTANCE (SERVER-SIDE) Besides: emitting and listening to events broadcasting events joining and leaving rooms The Socket instance has a few attributes that may be of use in your application: Socket#idEach new connection LOGGING AND DEBUGGING Removing debug from your browser bundle. While useful during development, the debug package adds an extra weight to the final bundle (about 4KB minified and gzipped), that’s why it is excluded from the slim bundle (more details about the various browser bundles can be found here).. If you are using webpack, you can remove it with webpack-remove-debug:

CLIENT INSTALLATION

ADMIN UI | SOCKET.IOSEE MORE ON SOCKET.IO

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit

PRIVATE MESSAGING

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

CLIENT INSTALLATION

The client can also be run from Node.js. Note: for the reasons cited above, you may want to exclude debug from your browser bundle. With webpack, you can use webpack-remove-debug.. Note for TypeScript users: the types are now included in the socket.io-client package and thus the types from @types/socket.io-client are not needed anymore and may in fact cause errors: SERVER API | SOCKET.IO Socket. A Socket is the fundamental class for interacting with browser clients. A Socket belongs to a certain Namespace (by default /) and uses an underlying Client to communicate.. It should be noted the Socket doesn’t relate directly to the actual underlying TCP/IP socket and it is only the name of the class.. Within each Namespace, you can also define arbitrary channels (called room) that CLIENT API | SOCKET.IO io.protocol (Number) The protocol revision number (currently: 5). The protocol defines the format of the packets exchanged between the client and the server.

CLIENT INSTALLATION

The debug package allows to print debug information to the console. You can find more information here.. During development, we recommend to use the socket.io.dev.js bundle. By setting localStorage.debug = 'socket.io-client:socket', any event received by the client will be printed to the console.. For production, please use the socket.io.slim.js bundle, which is an optimized build excluding

TESTING | SOCKET.IO

Example with jest. Installation: npm i -D jest const { createServer } = require ("http"); const { Server } = require ("socket.io"); const Client = require ("socket.io

SOCKET.IO P2P

Today were very happy to introduce Socket.IO P2P, the easiest way to establish a bidirectional events channel between two peers with a server fallback to provide maximum reliability.. Lets look at the API and build a little chat application. Or check out the repository directly!. Socket.IO P2P provides an easy and reliable way to setup a WebRTC connection between peers and communicate

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command: CLIENT INITIALIZATION Once you have installed the Socket.IO client library, you can now init the client. The complete list of options can be found below. In the examples below, the io object comes either from: the { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit NATIVE SOCKET.IO AND ANDROID

CHAT | SOCKET.IO

Caught a mistake? Edit this page on GitHubGitHub

SOCKET.IO C++

Socket.IO C++. 13 April 2015 — Melo Yao. I’m really proud to announce the first release of the Socket.IO C++ Client on GitHub! Based on Boost and WebSocket++, this full-featured Socket.IO 1.0 client has the fundamental advantage of working on multiple SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

GET STARTED

Recommended for beginners to Socket.IO or Node.js. The “Hello world!” of the framework is here. Let’s create a classic CRUD ( C reate- R ead- U pdate- D elete) application with Socket.IO. We’ll introduce acknowledgements and the ability to broadcast events. A slightly more complex chat application, introducing middlewares and

rooms

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

GET STARTED

HOW IT WORKS

CLIENT INSTALLATION

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit NATIVE SOCKET.IO AND ANDROID

CHAT | SOCKET.IO

Caught a mistake? Edit this page on GitHubGitHub

SOCKET.IO C++

Socket.IO C++. 13 April 2015 — Melo Yao. I’m really proud to announce the first release of the Socket.IO C++ Client on GitHub! Based on Boost and WebSocket++, this full-featured Socket.IO 1.0 client has the fundamental advantage of working on multiple

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

GET STARTED

In this guide we’ll create a basic chat application. It requires almost no basic prior knowledge of Node.JS or Socket.IO, so it’s ideal for users of all knowledge levels. IntroductionWriting a chat ap

ROOMS | SOCKET.IO

In that case, every socket in the room excluding the sender will get the event.. To leave a channel you call leave in the same fashion as join.. Default room. Each Socket in Socket.IO is identified by a random, unguessable, unique identifier Socket#id.For your convenience, each socket automatically joins a room identified by its own id. SERVER API | SOCKET.IO Socket. A Socket is the fundamental class for interacting with browser clients. A Socket belongs to a certain Namespace (by default /) and uses an underlying Client to communicate.. It should be noted the Socket doesn’t relate directly to the actual underlying TCP/IP socket and it is only the name of the class.. Within each Namespace, you can also define arbitrary channels (called room) that CLIENT API | SOCKET.IO Manager. The Manager manages the Engine.IO client instance, which is the low-level engine that establishes the connection to the server (by using transports like WebSocket or HTTP long-polling). The Manager handles the reconnection logic. A single Manager can be used by

several Sockets.

LOGGING AND DEBUGGING Logging and debugging. Socket.IO is now completely instrumented by a minimalistic yet tremendously powerful utility called debug by TJ Holowaychuk. Before 1.0, the Socket.IO server would default to logging everything out to the console. This turned out to be annoyingly verbose for many users (although extremely useful for others), so now

we

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

SOCKET.IO P2P

Today were very happy to introduce Socket.IO P2P, the easiest way to establish a bidirectional events channel between two peers with a server fallback to provide maximum reliability.. Lets look at the API and build a little chat application. Or check out the repository directly!. Socket.IO P2P provides an easy and reliable way to setup a WebRTC connection between peers and communicate CLIENT INITIALIZATION Once you have installed the Socket.IO client library, you can now init the client. The complete list of options can be found below. In the examples below, the io object comes either from: the { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit NATIVE SOCKET.IO AND ANDROID

CHAT | SOCKET.IO

Caught a mistake? Edit this page on GitHubGitHub

SOCKET.IO C++

Socket.IO C++. 13 April 2015 — Melo Yao. I’m really proud to announce the first release of the Socket.IO C++ Client on GitHub! Based on Boost and WebSocket++, this full-featured Socket.IO 1.0 client has the fundamental advantage of working on multiple SOCKET.IOGET STARTEDDOCUMENTATIONDEMOSSERVER APICLIENT APIROOMS AND

NAMESPACES

SOCKET.IO 4.0 IS HERE. Socket.IO enables real-time, bidirectional and event-based communication. It works on every platform, browser or device, focusing equally on reliability and speed.

GET STARTED

Recommended for beginners to Socket.IO or Node.js. The “Hello world!” of the framework is here. Let’s create a classic CRUD ( C reate- R ead- U pdate- D elete) application with Socket.IO. We’ll introduce acknowledgements and the ability to broadcast events. A slightly more complex chat application, introducing middlewares and

rooms

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

GET STARTED

HOW IT WORKS

CLIENT INSTALLATION

EMIT CHEATSHEET

Server-sideio.on("connection", (socket) => { // basic emit socket.emit(/* */); // to all clients in the current namespace except the sender socket.broadcast.emit NATIVE SOCKET.IO AND ANDROID

CHAT | SOCKET.IO

Caught a mistake? Edit this page on GitHubGitHub

SOCKET.IO C++

Socket.IO C++. 13 April 2015 — Melo Yao. I’m really proud to announce the first release of the Socket.IO C++ Client on GitHub! Based on Boost and WebSocket++, this full-featured Socket.IO 1.0 client has the fundamental advantage of working on multiple

INTRODUCTION

What Socket.IO isSocket.IO is a library that enables real-time, bidirectional and event-based communication between the browser and the server. It consists of: a Node.js server: Source |

GET STARTED

In this guide we’ll create a basic chat application. It requires almost no basic prior knowledge of Node.JS or Socket.IO, so it’s ideal for users of all knowledge levels. IntroductionWriting a chat ap

ROOMS | SOCKET.IO

In that case, every socket in the room excluding the sender will get the event.. To leave a channel you call leave in the same fashion as join.. Default room. Each Socket in Socket.IO is identified by a random, unguessable, unique identifier Socket#id.For your convenience, each socket automatically joins a room identified by its own id. SERVER API | SOCKET.IO Socket. A Socket is the fundamental class for interacting with browser clients. A Socket belongs to a certain Namespace (by default /) and uses an underlying Client to communicate.. It should be noted the Socket doesn’t relate directly to the actual underlying TCP/IP socket and it is only the name of the class.. Within each Namespace, you can also define arbitrary channels (called room) that LOGGING AND DEBUGGING Removing debug from your browser bundle. While useful during development, the debug package adds an extra weight to the final bundle (about 4KB minified and gzipped), that’s why it is excluded from the slim bundle (more details about the various browser bundles can be found here).. If you are using webpack, you can remove it with webpack-remove-debug: CLIENT API | SOCKET.IO io.protocol (Number) The protocol revision number (currently: 5). The protocol defines the format of the packets exchanged between the client and the server.

HANDLING CORS

If you have properly configured your server (see above), this could mean that your browser wasn’t able to reach the Socket.IO server.. The following command:

SOCKET.IO P2P

Today were very happy to introduce Socket.IO P2P, the easiest way to establish a bidirectional events channel between two peers with a server fallback to provide maximum reliability.. Lets look at the API and build a little chat application. Or check out the repository directly!. Socket.IO P2P provides an easy and reliable way to setup a WebRTC connection between peers and communicate

SOCKET.IO C++

I’m really proud to announce the first release of the Socket.IO C++ Client on GitHub!. Based on Boost and WebSocket++, this full-featured Socket.IO 1.0 client has the fundamental advantage of working on multiple platforms.Check out the directory of CLIENT INITIALIZATION Once you have installed the Socket.IO client library, you can now init the client. The complete list of options can be found below. In the examples below, the io object comes either from: the