I have the following lines of code in my index.js file:
const express = require('express');
const app = express();
const server = require('http').Server(app);
const io = require('socket.io').listen(server);
When I start my server with:
node --inspect server/index.js
I get:
TypeError: require(...).listen is not a function.
Any and all help appreciated!
You need http server.
The correct way to start a socket server is,
const express = require("express");
const http = require("http");
const app = express();
const server = http.createServer(app)
const socketio = require('socket.io')
const io = socketio(server);
io.on("connection", socket => {
console.log("connected");
socket.on("welcome", (data) => {
console.log("welcome message", data);
})
});
server.listen(3000, () => console.log(`listen on port ${port}`))
The client,
const io = require("socket.io-client");
let socket = io.connect("http://localhost:3000");
socket.emit("welcome", "Hi");
Related
I am using Node.JS and I am using http to use an express server which then my WebSocket is on, but when I try to connect to the socket it gives me an 'Expected HTTP/' error.
My code:
const express = require('express');
const app = express();
const server = require('http').createServer(app);
app.get('/', (req, res) => {
res.send("Hello World!");
});
const wss = new WebSocket.Server({ server });
// web socket stuff here
server.listen(port, () => {
console.log(`HTTP Server started on port ${port}`);
});
And then on another Node project, I have this to connect:
const WebSocket = require('ws');
const ws = new WebSocket.WebSocket('ws://localhost:3000/ws');
Any help?
//my memory in this question was that
const WebSocket = require('ws');
const socket = new WebSocket.Server({ port: 2424, host: "localhost"});
socket.on('connection', function(ws, wss) {
var domain = wss.headers.origin;
//etc...
But maybe you have a front for communicate if is not the good response ?
A form in the index.html will make a post request to the /history route and fetch the data from the MongoDB database:
server.js:
const express = require('express');
const app = express();
const path = require('path');
const http = require('http');
const https = require('https');
const server = http.createServer(app);
const io = require('socket.io')(server);
app.get('/history', (req, res) => {
res.sendFile(__dirname + '/client/history.html');
});
app.post("/history", (req, res)=> {
// fetch data from database
io.emit('data-history', data)
}
In the history.js:
const socket = io('http://localhost:3000');
io.on('data-history', (data) => {
// render data to the page
}
Somehow the data cannot be transferred from server.js to history.js. I am aware that the socket got disconnected when I am switching pages,
I have an existing project written in Express, where I've made a messaging system. Everything was working on POST/GET methods (to send and receive the messages).
I wanted to make them appear in real time, so I installed socket.io both on the client and server side. In my server.js I added these lines:
const http = require("http");
const io = require("socket.io");
const server = http.createServer();
const socket = io.listen(server);
and changed my app.listen(...) into server.listen(...).
Added also:
socket.on("connection", socket => {
console.log("New client connected");
socket.on('test', (test) => {
console.log('test-test')
});
socket.emit('hello', {hello:'hello!'});
socket.on("disconnect", () => console.log("Client disconnected"));
});
On the front part I put such code in the componentDidMount method:
const socket = socketIOClient();
socket.emit('test', {test:'test!'})
socket.on('hello', () => {
console.log('aaa')
})
Now I got 2 problems. Although the console.log() works correctly, I get an error on the React app:
WebSocket connection to 'ws://localhost:3000/sockjs-node/039/lmrt05dl/websocket' failed: WebSocket is closed before the connection is established.
Is that normal?
Also, when I change app.listen(...) into server.listen(...) in the server.js file, my routing stops working. All the POST and GET methods don't work, because the server is responding endlessly. Is that possible to use the socket.io just on a specific method in a specific routing file?
I keep my routes that way: app.use('/api/user', user); where user is a router file.
UPDATE:
full server.js require:
const express = require('express');
const mongoose = require('mongoose');
const dotenv = require('dotenv');
const bodyparser = require('body-parser');
const passport = require('passport');
const user = require('./routes/api/v1/User');
const company = require('./routes/api/v1/Company');
const http = require("http");
const io = require("socket.io");
const app = express();
dotenv.config();
app.use(passport.initialize());
require('./config/seed');
require('./config/passport')(passport);
const server = http.createServer();
const socket = io.listen(server);
You're not initializing server properly. Try making the following change
// const server = http.createServer();
const server = http.createServer(app);
and make sure you listen on server and not io
server.listen(PORT_GOES_HERE)
[UPDATE]
Working Example:
var app = require('express')();
var server = require('http').Server(app);
var io = require('socket.io')(server);
server.listen(80);
// WARNING: app.listen(80) will NOT work here!
// DO STUFF WITH EXPRESS SERVER
app.get('/', function (req, res) {
res.sendFile(__dirname + '/index.html');
});
io.on('connection', function (socket) {
socket.emit('news', { hello: 'world' });
socket.on('my other event', function (data) {
console.log(data);
});
});
For more details check this: https://socket.io/docs/
I'm trying to use Socket.io combined with Express.JS (using Express application generator).
I've found some aswers how to do this (Using socket.io in Express 4 and express-generator's /bin/www).My problem is that i cannot make use of the sockets inside the routes folder.
I can use them in the app.js and bin/www.js files. When i call the route index.js it just keeps loading the webpage for a long time without giving any errors.
bin/www.js
...
/**
* Create HTTP server.
*/
var server = http.createServer(app);
var io = app.io
io.attach( server );
...
app.js
...
// Express
var app = express();
// Socket.io
var io = socket_io();
app.io = io;
var routes = require('./routes/index')(io);
...
routes/index.js
module.exports = function(io) {
var app = require('express');
var router = app.Router();
io.on('connection', function(socket) {
console.log('User connected');
});
return router;
}
Here is a simple example on how to use Socket.io with Express that I made available on GitHub here:
https://github.com/rsp/node-websocket-vs-socket.io
The backend code is this:
var path = require('path');
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.get('/', (req, res) => {
console.error('express connection');
res.sendFile(path.join(__dirname, 'si.html'));
});
io.on('connection', s => {
console.error('socket.io connection');
for (var t = 0; t < 3; t++)
setTimeout(() => s.emit('message', 'message from server'), 1000*t);
});
http.listen(3002, () => console.error('listening on http://localhost:3002/'));
console.error('socket.io example');
See https://github.com/rsp/node-websocket-vs-socket.io/blob/master/si.js
As you can see here, I am creating the express app with:
var app = require('express')();
Then I create an http server with that app with:
var http = require('http').Server(app);
And finally I use that http server to create the Socket.io instance:
var io = require('socket.io')(http);
After running:
http.listen(3002, () => console.error('listening on http://localhost:3002/'));
it all works together.
You can see the entire example on GitHub with both backend and frontend code that works. It currently uses Express 4.14.0 and socket.io 1.4.8.
For anyone who still want to use socket.io and express http request. Easiest way is to create two seprate instance of http server listing to different ports. 1 for websockets and 2nd for api requests.
const express = require("express");
const app = express();
const httpServer = require("http").createServer(app);
const io = require("socket.io")(httpServer, {
path: '/'
});
// routes and io on connection
httpServer.listen(5000, () => {
console.log("Websocket started at port ", 5000)
});
app.listen(3000, () =>{
console.log("Http server listening at", 3000)
})
i am trying to get my chat app in node.js/socket.io to work on SSL (https), i am now at the moment i dont get errors when i startup the server but i cant connect anymore.
I googled and tried so much examples but i cant get it to work.
This was my old code (this works in http)
var express = require('express')
, app = express()
, http = require('http')
, server = http.createServer(app)
, io = require('socket.io').listen(server);
server.listen(8080);
app.get('/', function (req, res) {
res.sendfile(__dirname + '/index.html');
});
This is my changed code:
var https = require('https');
var fs = require('fs');
var options = {
key: fs.readFileSync('cert.key'),
cert: fs.readFileSync('cert.crt')
};
var express = require('express')
, app = express();
var server = https.createServer(options);
var io = require('socket.io').listen(server);
server.listen(8080);
app.get('/', function (req, res) {
res.sendfile(__dirname + '/index.html');
});
This is how I created the https server on node. Try it once it is working fine for me .
var port = "80";
var express = require('express')
, app = express()
, http = require('http')
, server = http.createServer(app);
server.listen(port);
var fs = require('fs');
var net = require('net');
var tls = require('tls');
var sslOptions = {
key: fs.readFileSync('public/server.key'),
cert: fs.readFileSync('public/server.crt')
};
tls.createServer(sslOptions, function (cleartextStream) {
var cleartextRequest = net.connect({
port: port, //your port
host: serverStr // your server address
}, function () {
cleartextStream.pipe(cleartextRequest);
cleartextRequest.pipe(cleartextStream);
});
}).listen(443);