How to import socket.io npm packege - Nodejs

Question

const socketio = new Server();

import Server from 'socket.io';
SyntaxError: The requested module 'socket.io' does not provide an export named 'default'

```const app = express(); const server = createServer(app); const socketio = io(server);``` I am still getting the following error ```const socketio = io(server); ^ TypeError: io is not a function``` — John John, Dec 06 '20 at 05:29
Does this answer your question? [Pass options to ES6 module imports](https://stackoverflow.com/questions/29923879/pass-options-to-es6-module-imports) — turivishal, Dec 06 '20 at 06:04

Megh Agarwal · Accepted Answer · 2021-06-03T04:30:40.050

10

There are two kinds of exports: named exports (several per module) and default exports (one per module). It is possible to use both at the same time, but usually it is best to keep them separate.

Why are you receiving this error: The import statement you wrote, provides the Server which is not a default export. If socket.io had actually exported Server as below, then you would not get an error.

module.exports = {
  //Other exports
  Server as default
}

~~You could have done this:~~

import * as io from "socket.io"
import express from 'express';
import { createServer } from 'http';

const app = express(); 
const server = createServer(app); 
const socketio = new io.Server(server);

Edit:

You can import socket.io like this:

import { Server } from 'socket.io';
import express from 'express';
import { createServer } from 'http';

const app = express(); 
const server = createServer(app); 
const socketio = new Server(server);

edited Jun 03 '21 at 04:30

answered Dec 06 '20 at 05:46

Megh Agarwal

216
1
7

```import express from 'express'; import { createServer } from 'http'; import * as io from 'socket.io'; const app = express(); const server = createServer(app); const socketio = io(server);``` – John John Dec 06 '20 at 05:50
here is the error ```const socketio = io(server); ^ TypeError: io is not a function``` – John John Dec 06 '20 at 05:51
import it like then then: `import { io } from 'socket.io'` – Megh Agarwal Dec 06 '20 at 05:59
```import { io } from 'socket.io'; ^^ SyntaxError: The requested module 'socket.io' does not provide an export named 'io'``` – John John Dec 06 '20 at 06:01
When I try this method, I just get io.Server is not a constructor error.. =/ any ideas what might be causing that? – Nick Jun 02 '21 at 21:20
@Nick I have updated the answer. Please try that. – Megh Agarwal Jun 03 '21 at 04:32

John John · Answer 2 · 2020-12-06T06:44:36.730

2

I can not beleive Socket.io is making it so difficult to import their npm package.

Here is the answer. Thank you @MeghAgarwal

import { Server } from 'socket.io';
import express from 'express';
import { createServer } from 'http';

const app = express(); 
const server = createServer(app); 
const socketio = new Server(server);

edited Dec 06 '20 at 06:44

answered Dec 06 '20 at 06:15

John John

1,305
2
16
37

score 1 · Answer 3 · 2020-12-07T08:51:30.090

1

As of v3, the correct way to do it is:


const httpServer = require('http').createServer((req, res) => {
  res.setHeader('Content-Type', 'text/html');
  res.setHeader('Content-Length', Buffer.byteLength(content));
  res.end(content);
});
// Or const httpServer = require('http').createServer(app) if you use express

const io = require('socket.io')(httpServer);

And if you import * as io from 'socket.io', you got to call io.io(httpServer). I ran into the same error

edited Dec 07 '20 at 08:51

answered Dec 06 '20 at 05:37

this is what i did ```const app = express(); const server = createServer(app); // socketio const socketio = io(server);``` – John John Dec 06 '20 at 05:42
const server = require('http').createServer(app) would do the trick @John – Dec 06 '20 at 05:57
I need to use ```import``` – John John Dec 06 '20 at 05:58
I also used `import * as io from 'socket.io' `, but I had to do `const socket = new io.Server(server, . . . . .` – Mike K Jan 11 '21 at 11:04

score 0 · Answer 4 · answered Mar 08 '21 at 18:00

0

I got the same error. This works for me

const express = require('express');
const app = express();

const io = require("socket.io")(80);
const http = require("http");
const server = http.createServer(app);

answered Mar 08 '21 at 18:00

Azad Kumar

13
2

How to import socket.io npm packege - Nodejs

4 Answers4