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OpenFin JavaScript API

Welcome to the documentation for the OpenFin JavaScript/TypeScript API. OpenFin uses TypeScript strictly as a static check on the validity of JavaScript API usage, so these API docs are valid for both JavaScript and TypeScript.

This API allows you to create an HTML/JavaScript application that has access to the native windowing environment, can communicate with other applications and has access to sandboxed system-level features.

The fin namespace

When running within the OpenFin Runtime your web applications have access to the fin namespace and all the modules within the API without the need to include additional source files. You can treat the fin namespace as you would the window, navigator or document objects.


New applications and windows are instantiated by the respective start and create calls with the following options objects:

For a single-page reference to all application settings and configuration options, see also our Application Config page.


<!DOCTYPE html>
#status-indicator {
display: inline-block;
height: 10px;
width: 10px;
background-color: red;
border-radius: 20px;
#status-indicator.online {
background-color: green;
<script type="text/javascript">
fin.System.getVersion().then(version => {
document.querySelector('#of-version').innerText = version;
OpenFin version <span id="of-version"></span>