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    ෴ browserver-node ෴

    Build Status

    This is a browserver proxy for node.js.

    Use browserver-node to create servers that act as a two-way proxies between an HTTP server and a WebSocket server, by

    • forwarding incoming HTTP requests on to WebSocket connected clients, and back.
    • forwarding incoming WebSocket messages to other HTTP servers, and back.

    This library, along with browserver-client, is all the code you need to set up your own browserver.


    // http, websocket, and browservers
    var http   = require("http")
    var engine = require("")
    var brow   = require("brow")
    function handler(req, res) {
      // your usual HTTP server logic
    // instantiate http and websocket servers
    var httpServer = http.createServer(handler)
    var wsServer   = engine.attach(httpServer)
    // pass each to a new browserver...
    var browServer = new brow.Server({
      http: httpServer,
      ws: wsServer,
      host: "*"
    // ... and start listening!
    httpServer.listen(80, function() {
      // wait for incoming/outgoing browser connections...


    browserver is available through npm.

    npm install brow


    browserver = new brow.Server(options)

    This joins a WebSocket server and HTTP server, returning a new browserver instance. The options argument accepts the following properties:

    • ws: Required. Must be an instance of a WebSocket server (such as ws) or compatible shim (such as, that emits socket instances through connection events.

    • http: Optional. If specified, must be an instance of http.Server. If omitted, an instance will be instantiated and bound to port 3572 (the Unicode codepoint for the brow ).

    • host Optional. If specified, must be a string containing one and only one asterisk (*), which is replaced with a socket id when a WebSocket connection is established. Note that this means you will need a wildcard CNAME or A record in your DNS settings that resolves to the appropriate domain or IP address. If omitted, CloudFoundry's * domain is used, which resolves all domains/subdomains to

    browserver.on("connection", function(client){ ... })

    The browserver server emits a connection event with a WebSocket-connected browserver client, whenever one connects. Each client is an instance of brow.Client, with an id property that defaults to a random lowercase alphanumeric string generated upon instantiation. How these ids are generated can be customized by overriding the static method.

    client.on("close", function(){ ... })

    browserver clients emit a close event when their underlying WebSocket is closed.


    • Add integrated hooks for authorization and authentication of requests, both incoming and outgoing.




    npm i brow

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