library for golang, a realtime application framework.
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erkie Merge pull request #213 from HaraldNordgren/go_versions
Bump Go versions and use 1.n.x to get latest minor versions
Latest commit c8aeb1e Nov 1, 2018

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Please use v1.4 branch, or import "". I have no time to maintain master branch now is an implementation of in golang, which is a realtime application framework.

It is compatible with latest implementation of in node.js, and supports room and namespace.

  • for compatability with 0.9.x, please use branch 0.9.x *


Install the package with:

go get

Import it with:

import ""

and use socketio as the package name inside the code.


Please check the example folder for details.

package main

import (


func main() {
	server, err := socketio.NewServer(nil)
	if err != nil {
	server.On("connection", func(so socketio.Socket) {
		log.Println("on connection")
		so.On("chat message", func(msg string) {
			log.Println("emit:", so.Emit("chat message", msg))
			so.BroadcastTo("chat", "chat message", msg)
		so.On("disconnection", func() {
			log.Println("on disconnect")
	server.On("error", func(so socketio.Socket, err error) {
		log.Println("error:", err)

	http.Handle("/", server)
	http.Handle("/", http.FileServer(http.Dir("./asset")))
	log.Println("Serving at localhost:5000...")
	log.Fatal(http.ListenAndServe(":5000", nil))

Acknowledgements in 1.X.X

See documentation about acknowledgements

Sending ACK with data from SERVER to CLIENT
  • Client-side
 //using client-side
 socket.emit('some:event', JSON.stringify(someData), function(data){
       console.log('ACK from server wtih data: ', data));
  • Server-side
// The return type may vary depending on whether you will return
// In golang implementation of don't used callbacks for acknowledgement,
// but used return value, which wrapped into ack package and returned to the client's callback in JavaScript
so.On("some:event", func(msg string) string {
	return msg //Sending ack with data in msg back to client, using "return statement"
Sending ACK with data from CLIENT to SERVER
  • Client-side
//using client-side
//last parameter of "on" handler is callback for sending ack to server with data or without data
socket.on('some:event', function (msg, sendAckCb) {
    //Sending ACK with data to server after receiving some:event from server
    sendAckCb(JSON.stringify(data)); // for example used serializing to JSON
  • Server-side
//You can use Emit or BroadcastTo with last parameter as callback for handling ack from client
//Sending packet to room "room_name" and event "some:event"
so.BroadcastTo("room_name", "some:event", dataForClient, func (so socketio.Socket, data string) {
	log.Println("Client ACK with data: ", data)

// Or

so.Emit("some:event", dataForClient, func (so socketio.Socket, data string) {
	log.Println("Client ACK with data: ", data)


The 3-clause BSD License - see LICENSE for more details