Using Websocket with express and Nodejs not working

Question

I have this code which I am using for my express server. The server works when I access the routes over http however when I try to connect to it over wss it doesnt work. What am I doing wrong?

const morgan = require("morgan");
const cors = require("cors");
const passport = require("passport");
const localStrategy = require("./auth/local");
const jwtStrategy = require("./auth/jwt");
const expressValidator = require("express-validator");
const config = require("./config");

const app = express();

const http = require("http").Server(app);
const io = require("socket.io")(http);

app.use(cors());
app.use(express.json());
app.use(expressValidator());
app.use(morgan("common"));
app.use(passport.initialize());

passport.use(localStrategy);
passport.use(jwtStrategy);

require("./routes")(app);

io.on("connect_error", (err) => {
  console.log(`connect_error due to ${err.message}`);
});
io.on("connection", (socket) => {
  console.log("a user connected", socket);
});

http.listen(config.port);

module.exports = app;

You can look at this example, it uses a slightly different pattern. But the problem might also be on your client side. — tromgy
– tromgy, Commented Jan 20, 2022 at 0:40
I am using this website to test it. piesocket.com/websocket-tester — ssaqan
– ssaqan, Commented Jan 20, 2022 at 0:47

O. Jones · Accepted Answer · 2022-01-20 01:10:01Z

2

Try using ws: in place of wss: for a quick fix.

wss: is the TLS-secured version of ws:, analogous to https: and http:. In fact, websocket connections to a server begin their lives as http / https connections. They're then "upgraded" to websocket connections by the websocket protocol.

So, to get wss: to work on that server of yours, start by getting https: working for the express webserver part. It's the https server behind express that will also handle the connections to be upgraded.

answered Jan 20, 2022 at 1:10

O. Jones

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