node package manager



real-time, in-app notifications and admin for web and mobile via the command line. see it in action


Sending notifications with Holler is as easy as four steps:

1. Install a module

Holler is built with Node and is distributed as an npm module. If you don't have Node yet, install the hell out of it. Next we just install holler:

npm install holler -g

2. Include Holler

New! Be sure to include the holler.css stylesheet as of v1.9.0:

<link href="PATH/TO/holler/css" rel="stylesheet"/>

On the client, Holler can be easily configured to use a specific host and port regardless of the app's http server. This is done via a global hollerConfig object. The holler-client.js script tag should then be included:

      var hollerConfig = {
        host: "",
        port: "1337"
<script type="text/javascript" src="PATH/TO/holler-client.min.js"></script>

3. Start a server

The server can be started with an optional port. If no port is specified, it will be defaulted to 1337.

holler-server 1337

4. Holler stuff

Show notifications to all users currently using your app in real-time using holler.js. Notifications use Alertify so they look nice and sexy.

  • Log Messages

holler http://yourServerUrl:port log "This is a standard log message."
  • Success Messages

holler http://yourServerUrl:port success "This is a success message."
  • Error Messages

holler http://yourServerUrl:port error "This is an error message."
  • Refresh Page

Now you can use holler to perform admin tasks such as refreshing the current page. Again, all users using the app will have their page refreshed in real-time.

holler http://yourServerUrl:port refresh
  • Error Messages

You can also redirect the current page to a new url. Again, all users using the app will have their page redirected in real-time.

holler http://yourServerUrl:port redirect http://someOtherUrl


Holler.js uses Grunt for file linting and uglification. To start contributing, first make sure node is installed. Then:

git clone && cd holler
git submodule update --recursive --init
npm install
# start a server at localhost (e.g.
# view demo.html in a browser
# send a log message
holler log "foobar"