Web UI

st2web is a React-based HTML5 web application. It allows you to control the whole process of execution, from running an action to seeing the results of the execution. It also helps you to explore workflow executions up to the results of individual tasks. All in real time.


st2web is installed via the st2web RPM or deb package. This is installed by default when using the one-line install method. You can access the UI by pointing your browser to https://<server hostname>/. If you are using st2vagrant, it would be

st2web is a pure HTML5 application and consists only of js scripts, html templates, css styles and static files including custom fonts and svg images. For the application to work correctly, all files should be served to the browser. By default they are served by nginx. For your custom deployments, you can also use Apache or a similar dedicated web server.

Note that the StackStorm API endpoint should be accessible from the browser, not the web server running static content.


For the UI to work properly, both the web client and StackStorm server side should be configured appropriately.

On the web client side, the file config.js in the project contains the list of servers this UI can connect to. This is typically /opt/stackstorm/static/webui/config.js. The file consists of an array of objects, each with name, url and auth properties.

hosts: [{
  name: 'Express Deployment',
  url: '',
  auth: ''
  name: 'Development Environment',
  url: 'http://:9101'
  auth: 'https://:9100'

Multiple servers can be configured for the user to pick from. To disconnect from the current server and return to login screen, pick ‘Disconnect’ from the drop down at the top right corner of the UI.

On the StackStorm side, CORS should also be configured. In st2.conf, the allow_origin property of the [api] section should contain the Origin header the browser sends with every request. For example, if you have deployed the UI on its own server and are accessing it using http://webui.example.com, your config should look like this:

# Host and port to bind the API server.
host =
port = 9101
logging = /etc/st2/logging.api.conf
# List of allowed origins for CORS, use when deploying st2web client
# The URL must match the one the browser uses to access the st2web
allow_origin = http://webui.example.com

Origin consists of scheme, hostname and port (if it isn’t 80). Path (including trailing slash) should be omitted.

Please note that some of the origins are already included by default and do not require additional configuration:

  • http://localhost:3000 - development version of gulp running locally

  • http://localhost:9101, - st2api pecan deployment

  • api_url from [auth] section of st2.conf

Although this is not recommended and will undermine your security, you can allow every web UI deployment to connect to your server by setting allow_origin = *.


To configure st2web to support authentication, edit config.js and add an auth: line for every server that supports authentication. This should specify the URL to the auth service - usually this will look something like auth: ''. To enable authentication on the server side, please refer to Authentication.