Reverse Proxy for websockets using Express JS

reverse-ws-proxy.js

var http = require('http'),
    httpProxy = require('http-proxy'),
    express = require('express');

// create a server
var app = express();
var proxy = httpProxy.createProxyServer({ target: 'http://localhost:8080', ws: true });
var server = require('http').createServer(app);

// proxy HTTP GET / POST
app.get('/chat/*', function(req, res) {
  console.log("proxying GET request", req.url);
  proxy.web(req, res, {});
});
app.post('/chat/*', function(req, res) {
  console.log("proxying POST request", req.url);
  proxy.web(req, res, {});
});

// Proxy websockets
server.on('upgrade', function (req, socket, head) {
  console.log("proxying upgrade request", req.url);
  proxy.ws(req, socket, head);
});

// serve static content
app.use('/', express.static(__dirname + "/public"));

server.listen(9000);

Thankyou this saved me a lot of time :)

Line 7 should include some minimal error handling or there will be trouble when the target server is temporarily not available

var proxy = httpProxy.createProxyServer({ target: 'http://localhost:8080', ws: true });
.on("error", (e) => {
            console.log(e);
        });