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2023

2022

2021

2020

2019

2018

Release notes

4.7.1 (2023-06-28)

The client bundle contains a few fixes regarding the WebTransport support.

Dependencies

4.7.0 (2023-06-22)

Bug Fixes

  • remove the Partial modifier from the socket.data type (#4740) (e5c62ca)

Features

Support for WebTransport

The Socket.IO server can now use WebTransport as the underlying transport.

WebTransport is a web API that uses the HTTP/3 protocol as a bidirectional transport. It's intended for two-way communications between a web client and an HTTP/3 server.

References:

Until WebTransport support lands in Node.js, you can use the @fails-components/webtransport package:

import { readFileSync } from "fs";
import { createServer } from "https";
import { Server } from "socket.io";
import { Http3Server } from "@fails-components/webtransport";

// WARNING: the total length of the validity period MUST NOT exceed two weeks (https://w3c.github.io/webtransport/#custom-certificate-requirements)
const cert = readFileSync("/path/to/my/cert.pem");
const key = readFileSync("/path/to/my/key.pem");

const httpsServer = createServer({
  key,
  cert
});

httpsServer.listen(3000);

const io = new Server(httpsServer, {
  transports: ["polling", "websocket", "webtransport"] // WebTransport is not enabled by default
});

const h3Server = new Http3Server({
  port: 3000,
  host: "0.0.0.0",
  secret: "changeit",
  cert,
  privKey: key,
});

(async () => {
  const stream = await h3Server.sessionStream("/socket.io/");
  const sessionReader = stream.getReader();

  while (true) {
    const { done, value } = await sessionReader.read();
    if (done) {
      break;
    }
    io.engine.onWebTransportSession(value);
  }
})();

h3Server.startServer();

Added in 123b68c.

Client bundles with CORS headers

The bundles will now have the right Access-Control-Allow-xxx headers.

Added in 63f181c.

Dependencies

4.6.2 (2023-05-31)

Bug Fixes

  • exports: move types condition to the top (#4698) (3d44aae)

Dependencies

4.6.1 (2023-02-20)

Bug Fixes

  • properly handle manually created dynamic namespaces (0d0a7a2)
  • types: fix nodenext module resolution compatibility (#4625) (d0b22c6)

Dependencies

4.6.0 (2023-02-07)

Bug Fixes

  • add timeout method to remote socket (#4558) (0c0eb00)
  • typings: properly type emits with timeout (f3ada7d)

Features

Promise-based acknowledgements

This commit adds some syntactic sugar around acknowledgements:

  • emitWithAck()
try {
  const responses = await io.timeout(1000).emitWithAck("some-event");
  console.log(responses); // one response per client
} catch (e) {
  // some clients did not acknowledge the event in the given delay
}

io.on("connection", async (socket) => {
    // without timeout
  const response = await socket.emitWithAck("hello", "world");

  // with a specific timeout
  try {
    const response = await socket.timeout(1000).emitWithAck("hello", "world");
  } catch (err) {
    // the client did not acknowledge the event in the given delay
  }
});
  • serverSideEmitWithAck()
try {
  const responses = await io.timeout(1000).serverSideEmitWithAck("some-event");
  console.log(responses); // one response per server (except itself)
} catch (e) {
  // some servers did not acknowledge the event in the given delay
}

Added in 184f3cf.

Connection state recovery

This feature allows a client to reconnect after a temporary disconnection and restore its state:

  • id
  • rooms
  • data
  • missed packets

Usage:

import { Server } from "socket.io";

const io = new Server({
  connectionStateRecovery: {
    // default values
    maxDisconnectionDuration: 2 * 60 * 1000,
    skipMiddlewares: true,
  },
});

io.on("connection", (socket) => {
  console.log(socket.recovered); // whether the state was recovered or not
});

Here's how it works:

  • the server sends a session ID during the handshake (which is different from the current id attribute, which is public and can be freely shared)
  • the server also includes an offset in each packet (added at the end of the data array, for backward compatibility)
  • upon temporary disconnection, the server stores the client state for a given delay (implemented at the adapter level)
  • upon reconnection, the client sends both the session ID and the last offset it has processed, and the server tries to restore the state

The in-memory adapter already supports this feature, and we will soon update the Postgres and MongoDB adapters. We will also create a new adapter based on Redis Streams, which will support this feature.

Added in 54d5ee0.

Compatibility (for real) with Express middlewares

This feature implements middlewares at the Engine.IO level, because Socket.IO middlewares are meant for namespace authorization and are not executed during a classic HTTP request/response cycle.

Syntax:

io.engine.use((req, res, next) => {
  // do something

  next();
});

// with express-session
import session from "express-session";

io.engine.use(session({
  secret: "keyboard cat",
  resave: false,
  saveUninitialized: true,
  cookie: { secure: true }
}));

// with helmet
import helmet from "helmet";

io.engine.use(helmet());

A workaround was possible by using the allowRequest option and the "headers" event, but this feels way cleaner and works with upgrade requests too.

Added in 24786e7.

Error details in the disconnecting and disconnect events

The disconnect event will now contain additional details about the disconnection reason.

io.on("connection", (socket) => {
  socket.on("disconnect", (reason, description) => {
    console.log(description);
  });
});

Added in 8aa9499.

Automatic removal of empty child namespaces

This commit adds a new option, "cleanupEmptyChildNamespaces". With this option enabled (disabled by default), when a socket disconnects from a dynamic namespace and if there are no other sockets connected to it then the namespace will be cleaned up and its adapter will be closed.

import { createServer } from "node:http";
import { Server } from "socket.io";

const httpServer = createServer();
const io = new Server(httpServer, {
  cleanupEmptyChildNamespaces: true
});

Added in 5d9220b.

A new "addTrailingSlash" option

The trailing slash which was added by default can now be disabled:

import { createServer } from "node:http";
import { Server } from "socket.io";

const httpServer = createServer();
const io = new Server(httpServer, {
  addTrailingSlash: false
});

In the example above, the clients can omit the trailing slash and use /socket.io instead of /socket.io/.

Added in d0fd474.

Performance Improvements

  • precompute the WebSocket frames when broadcasting (da2b542)

Dependencies

4.5.4 (2022-11-22)

This release contains a bump of:

Dependencies

4.5.3 (2022-10-15)

Bug Fixes

  • typings: accept an HTTP2 server in the constructor (d3d0a2d)
  • typings: apply types to "io.timeout(...).emit()" calls (e357daf)

Dependencies

4.5.2 (2022-09-02)

Bug Fixes

  • prevent the socket from joining a room after disconnection (18f3fda)
  • uws: prevent the server from crashing after upgrade (ba497ee)

Dependencies

2.5.0 (2022-06-26)

⚠️ WARNING ⚠️

The default value of the maxHttpBufferSize option has been decreased from 100 MB to 1 MB, in order to prevent attacks by denial of service.

Security advisory: GHSA-j4f2-536g-r55m

Bug Fixes

  • fix race condition in dynamic namespaces (05e1278)
  • ignore packet received after disconnection (22d4bdf)
  • only set 'connected' to true after middleware execution (226cc16)
  • prevent the socket from joining a room after disconnection (f223178)

Dependencies

4.5.1 (2022-05-17)

Bug Fixes

  • forward the local flag to the adapter when using fetchSockets() (30430f0)
  • typings: add HTTPS server to accepted types (#4351) (9b43c91)

Dependencies

4.5.0 (2022-04-23)

Bug Fixes

  • typings: ensure compatibility with TypeScript 3.x (#4259) (02c87a8)

Features

Catch-all listeners for outgoing packets

This is similar to onAny(), but for outgoing packets.

Syntax:

socket.onAnyOutgoing((event, ...args) => {
  console.log(event);
});

Added in 531104d.

Broadcast and expect multiple acknowledgements

Syntax:

io.timeout(1000).emit("some-event", (err, responses) => {
  // ...
});

Added in 8b20457.

maxHttpBufferSize value negotiation

A "maxPayload" field is now included in the Engine.IO handshake, so that clients in HTTP long-polling can decide how many packets they have to send to stay under the maxHttpBufferSize value.

This is a backward compatible change which should not mandate a new major revision of the protocol (we stay in v4), as we only add a field in the JSON-encoded handshake data:

0{"sid":"lv_VI97HAXpY6yYWAAAC","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":5000,"maxPayload":1000000}

Added in 088dcb4.

Dependencies

4.4.1 (2022-01-06)

Bug Fixes

  • types: make RemoteSocket.data type safe (#4234) (770ee59)
  • types: pass SocketData type to custom namespaces (#4233) (f2b8de7)

4.4.0 (2021-11-18)

Bug Fixes

  • only set 'connected' to true after middleware execution (02b0f73)

Features

  • add an implementation based on uWebSockets.js (c0d8c5a)
  • add timeout feature (f0ed42f)
  • add type information to socket.data (#4159) (fe8730c)

4.3.2 (2021-11-08)

Bug Fixes

  • fix race condition in dynamic namespaces (#4137) (9d86397)

4.3.1 (2021-10-16)

Bug Fixes

4.3.0 (2021-10-14)

Bug Fixes

  • typings: add name field to cookie option (#4099) (033c5d3)
  • send volatile packets with binary attachments (dc81fcf)

Features

4.2.0 (2021-08-30)

Bug Fixes

  • typings: allow async listener in typed events (ccfd8ca)

Features

  • ignore the query string when serving client JavaScript (#4024) (24fee27)

4.1.3 (2021-07-10)

Bug Fixes

  • fix io.except() method (94e27cd)
  • remove x-sourcemap header (a4dffc6)

4.1.2 (2021-05-17)

Bug Fixes

  • typings: ensure compatibility with TypeScript 3.x (0cb6ac9)
  • ensure compatibility with previous versions of the adapter (a2cf248)

4.1.1 (2021-05-11)

Bug Fixes

  • typings: properly type server-side events (b84ed1e)
  • typings: properly type the adapter attribute (891b187)

4.1.0 (2021-05-11)

Features

  • add support for inter-server communication (93cce05)
  • notify upon namespace creation (499c892)
  • add a "connection_error" event (7096e98, from engine.io)
  • add the "initial_headers" and "headers" events (2527543, from engine.io)

Performance Improvements

  • add support for the "wsPreEncoded" writing option (dc381b7)

4.0.2 (2021-05-06)

Bug Fixes

  • typings: make "engine" attribute public (b81ce4c)
  • properly export the Socket class (d65b6ee)

4.0.1 (2021-03-31)

Bug Fixes

  • typings: add fallback to untyped event listener (#3834) (a11152f)
  • typings: update return type from emit (#3843) (1a72ae4)

4.0.0 (2021-03-10)

Bug Fixes

  • make io.to(...) immutable (ac9e8ca)

Features

  • add some utility methods (b25495c)
  • add support for typed events (#3822) (0107510)
  • allow to exclude specific rooms when broadcasting (#3789) (7de2e87)
  • allow to pass an array to io.to(...) (085d1de)

3.1.2 (2021-02-26)

Bug Fixes

  • ignore packets received after disconnection (494c64e)

3.1.1 (2021-02-03)

Bug Fixes

  • properly parse the CONNECT packet in v2 compatibility mode (6f4bd7f)
  • typings: add return types and general-case overload signatures (#3776) (9e8f288)
  • typings: update the types of "query", "auth" and "headers" (4f2e9a7)

3.1.0 (2021-01-15)

Features

Bug Fixes

  • allow integers as event names (1c220dd)

2.4.1 (2021-01-07)

Reverts

  • fix(security): do not allow all origins by default (a169050)

3.0.5 (2021-01-05)

Bug Fixes

  • properly clear timeout on connection failure (170b739)

Reverts

  • restore the socket middleware functionality (bf54327)

2.4.0 (2021-01-04)

Bug Fixes

  • security: do not allow all origins by default (f78a575)
  • properly overwrite the query sent in the handshake (d33a619)

3.0.4 (2020-12-07)

3.0.3 (2020-11-19)

3.0.2 (2020-11-17)

Bug Fixes

  • merge Engine.IO options (43705d7)

3.0.1 (2020-11-09)

Bug Fixes

  • export ServerOptions and Namespace types (#3684) (f62f180)
  • typings: update the signature of the emit method (50671d9)

3.0.0 (2020-11-05)

Bug Fixes

  • close clients with no namespace (91cd255)

Features

  • emit an Error object upon middleware error (54bf4a4)
  • serve msgpack bundle (aa7574f)
  • add support for catch-all listeners (5c73733)
  • make Socket#join() and Socket#leave() synchronous (129c641)
  • remove prod dependency to socket.io-client (7603da7)
  • move binary detection back to the parser (669592d)
  • add ES6 module export (8b6b100)
  • do not reuse the Engine.IO id (2875d2c)
  • remove Server#set() method (029f478)
  • remove Socket#rooms object (1507b41)
  • remove the 'origins' option (a8c0600)
  • remove the implicit connection to the default namespace (3289f7e)
  • throw upon reserved event names (4bd5b23)

BREAKING CHANGES

  • the Socket#use() method is removed (see 5c73733)

  • Socket#join() and Socket#leave() do not accept a callback argument anymore.

Before:

socket.join("room1", () => {
 io.to("room1").emit("hello");
});

After:

socket.join("room1");
io.to("room1").emit("hello");
// or await socket.join("room1"); for custom adapters
  • the "connected" map is renamed to "sockets"
  • the Socket#binary() method is removed, as this use case is now covered by the ability to provide your own parser.
  • the 'origins' option is removed

Before:

new Server(3000, {
  origins: ["https://example.com"]
});

The 'origins' option was used in the allowRequest method, in order to determine whether the request should pass or not. And the Engine.IO server would implicitly add the necessary Access-Control-Allow-xxx headers.

After:

new Server(3000, {
  cors: {
    origin: "https://example.com",
    methods: ["GET", "POST"],
    allowedHeaders: ["content-type"]
  }
});

The already existing 'allowRequest' option can be used for validation:

new Server(3000, {
  allowRequest: (req, callback) => {
    callback(null, req.headers.referer.startsWith("https://example.com"));
  }
});

  • Socket#rooms is now a Set instead of an object

  • Namespace#connected is now a Map instead of an object

  • there is no more implicit connection to the default namespace:

// client-side
const socket = io("/admin");

// server-side
io.on("connect", socket => {
  // not triggered anymore
})

io.use((socket, next) => {
  // not triggered anymore
});

io.of("/admin").use((socket, next) => {
  // triggered
});
  • the Server#set() method was removed

This method was kept for backward-compatibility with pre-1.0 versions.

3.0.0-rc4 (2020-10-30)

Features

  • emit an Error object upon middleware error (54bf4a4)
  • serve msgpack bundle (aa7574f)

3.0.0-rc3 (2020-10-26)

Features

  • add support for catch-all listeners (5c73733)
  • make Socket#join() and Socket#leave() synchronous (129c641)
  • remove prod dependency to socket.io-client (7603da7)

BREAKING CHANGES

  • the Socket#use() method is removed (see 5c73733)

  • Socket#join() and Socket#leave() do not accept a callback argument anymore.

Before:

socket.join("room1", () => {
 io.to("room1").emit("hello");
});

After:

socket.join("room1");
io.to("room1").emit("hello");
// or await socket.join("room1"); for custom adapters

3.0.0-rc2 (2020-10-15)

Bug Fixes

  • close clients with no namespace (91cd255)

Code Refactoring

  • remove duplicate _sockets map (8a5db7f)

Features

  • move binary detection back to the parser (669592d)

BREAKING CHANGES

  • the "connected" map is renamed to "sockets"
  • the Socket#binary() method is removed, as this use case is now covered by the ability to provide your own parser.

3.0.0-rc1 (2020-10-13)

Features

  • add ES6 module export (8b6b100)
  • do not reuse the Engine.IO id (2875d2c)
  • remove Server#set() method (029f478)
  • remove Socket#rooms object (1507b41)
  • remove the 'origins' option (a8c0600)
  • remove the implicit connection to the default namespace (3289f7e)
  • throw upon reserved event names (4bd5b23)

BREAKING CHANGES

  • the 'origins' option is removed

Before:

new Server(3000, {
  origins: ["https://example.com"]
});

The 'origins' option was used in the allowRequest method, in order to determine whether the request should pass or not. And the Engine.IO server would implicitly add the necessary Access-Control-Allow-xxx headers.

After:

new Server(3000, {
  cors: {
    origin: "https://example.com",
    methods: ["GET", "POST"],
    allowedHeaders: ["content-type"]
  }
});

The already existing 'allowRequest' option can be used for validation:

new Server(3000, {
  allowRequest: (req, callback) => {
    callback(null, req.headers.referer.startsWith("https://example.com"));
  }
});

  • Socket#rooms is now a Set instead of an object

  • Namespace#connected is now a Map instead of an object

  • there is no more implicit connection to the default namespace:

// client-side
const socket = io("/admin");

// server-side
io.on("connect", socket => {
  // not triggered anymore
})

io.use((socket, next) => {
  // not triggered anymore
});

io.of("/admin").use((socket, next) => {
  // triggered
});
  • the Server#set() method was removed

This method was kept for backward-compatibility with pre-1.0 versions.

2.3.0 (2019-09-20)

This release mainly contains a bump of the engine.io and ws packages, but no additional features.

2.2.0 (2018-11-29)

Features

  • add cache-control header when serving the client source (#2907) (b00ae50)

Bug fixes

  • throw an error when trying to access the clients of a dynamic namespace (#3355) (a7fbd1a)

2.1.1 (2018-05-17)

Features

socket.local.to('room101').emit(/* */);

2.1.0 (2018-03-29)

Features

// by default, the object is recursively scanned to check whether it contains some binary data
// in the following example, the check is skipped in order to improve performance
socket.binary(false).emit('plain-object', object);

// it also works at the namespace level
io.binary(false).emit('plain-object', object);
io.of(/^\/dynamic-\d+$/).on('connect', (socket) => {
  // socket.nsp.name = '/dynamic-101'
});

// client-side
const client = require('socket.io-client')('/dynamic-101');

Bug fixes

  • properly emit 'connect' when using a custom namespace (#3197) (f4fc517)
  • include the protocol in the origins check (#3198) (1f1d64b)

Important note ⚠️ from Engine.IO 3.2.0 release

There are two non-breaking changes that are somehow quite important:

  • ws was reverted as the default wsEngine (socketio/engine.io#550), as there was several blocking issues with uws. You can still use uws by running npm install uws --save in your project and using the wsEngine option:
var engine = require('engine.io');
var server = engine.listen(3000, {
  wsEngine: 'uws'
});