CreateMonitor

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The CreateMonitor interface provides information on the progress of an AI model download or some fine-tuning data for the model.

It can be used via:

EventTarget CreateMonitor

Events

Inherits events from its parent, EventTarget.

downloadprogress

Fired when progress is made on the AI model download.

Examples

Basic CreateMonitor usage

A CreateMonitor instance is used via the monitor property of an AI API's create() method (Summarizer.create() is shown below). The monitor property takes a callback function as a value, the argument of which is the CreateMonitor instance. You can then monitor download progress via the instance's downloadprogress event.

js
const summarizer = await Summarizer.create({
  sharedContext:
    "A general summary to help a user decide if the text is worth reading",
  monitor(monitor) {
    monitor.addEventListener("downloadprogress", (e) => {
      console.log(`download progress: ${e.loaded}/${e.total}`);
    });
  },
});

const summary = await summarizer.summarize(myText);

Specifications

Specification
Writing Assistance APIs
# createmonitor

Browser compatibility

desktop mobile server
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
CreateMonitor
Experimental
Chrome – Full support
Chrome 138 (Release date: 2025-06-24)
footnote
footnote Availability may be subject to geographical restrictions.
Edge – No support
Edge 138 (Release date: 2025-06-26)
disabled
disabled From version 138 users must explicitly set the #edge-llm-summarization-api-for-phi-mini preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 122 (Release date: 2025-09-11)
footnote
footnote Availability may be subject to geographical restrictions.
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android
footnote No support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support
Deno – No support
Deno
footnote No support
Node.js – No support
Node.js
footnote No support
downloadprogress event
Experimental
Chrome – Full support
Chrome 138 (Release date: 2025-06-24)
footnote
footnote Availability may be subject to geographical restrictions.
Edge – No support
Edge 138 (Release date: 2025-06-26)
disabled
disabled From version 138 users must explicitly set the #edge-llm-summarization-api-for-phi-mini preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – Full support
Opera 122 (Release date: 2025-09-11)
footnote
footnote Availability may be subject to geographical restrictions.
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android
footnote No support
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support
Deno – No support
Deno
footnote No support
Node.js – No support
Node.js
footnote No support

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.
See implementation notes.
User must explicitly enable this feature.

See also