diff --git a/templates/js/www b/templates/js/www
index 2622a321..46a99f6f 100755
--- a/templates/js/www
+++ b/templates/js/www
@@ -12,7 +12,7 @@ var http = require('http');
  * Get port from environment and store in Express.
  */
 
-var port = process.env.PORT || '3000';
+var port = normalizePort(process.env.PORT || '3000');
 app.set('port', port);
 
 /**
@@ -29,6 +29,26 @@ server.listen(port);
 server.on('error', onError);
 server.on('listening', onListening);
 
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+  var port = parseInt(val, 10);
+
+  if (isNaN(port)) {
+    // named pipe
+    return val;
+  }
+
+  if (port >= 0) {
+    // port number
+    return port;
+  }
+
+  return false;
+}
+
 /**
  * Event listener for HTTP server "error" event.
  */
@@ -38,14 +58,18 @@ function onError(error) {
     throw error;
   }
 
+  var bind = typeof port === 'string'
+    ? 'Pipe ' + port
+    : 'Port ' + port
+
   // handle specific listen errors with friendly messages
   switch (error.code) {
     case 'EACCES':
-      console.error('Port ' + port + ' requires elevated privileges');
+      console.error(bind + ' requires elevated privileges');
       process.exit(1);
       break;
     case 'EADDRINUSE':
-      console.error('Port ' + port + ' is already in use');
+      console.error(bind + ' is already in use');
       process.exit(1);
       break;
     default: