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About Manifest V2 Getting started
What are extensions? What are themes? Frequently asked questions
Extension development overview Manifest file format Architecture overview Declare permissions Design the user interface Debugging extensions Samples
Message passing Content scripts Manage events with background scripts Match patterns Cross-origin isolation
Cross-origin XMLHttpRequest Using eval in Chrome extensions
Overriding Chrome settings Extending DevTools OAuth2: Authenticate users with Google Overriding Chrome pages Rich notifications API
Protect user privacy Declare permissions and warn users Stay secure Accessibility (a11y) Localization message formats Give users options
Chrome Web Store Alternative extension distribution options Installing extensions on Linux Tutorial: Google analytics
Extensions
Welcome What's new in Chrome extensions
Support and feedback Get help with Chrome extensions File a bug Submit a feature request Find and follow a bug
Welcome Extensions 101 Development basics Run scripts on every page Inject scripts into the active tab Manage tabs Handle events with service workers
Welcome to Manifest V3 Extensions platform vision Overview of Manifest V3
What are themes? Frequently asked questions
Migrate to Manifest V3 Manifest V3 migration checklist Update the manifest Migrate to a service worker Update your code Replace blocking web request listeners Improve extension security Publish your extension Manifest V2 support timeline Known issues when migrating to Manifest V3
API reference Samples
Extension development overview Manifest file format Architecture overview Declare permissions About extension service workers Design the user interface Debug extensions
About extension service workers Extension service worker basics The extension service worker lifecycle Events in service workers Use WebSockets in service workers
Message passing Content scripts Match patterns Using promises Cross-origin isolation Storage and cookies
Use eval() in sandboxed iframes
Overriding Chrome settings Extending DevTools Fetching favicons OAuth2: Authenticate users with Google Override Chrome pages Rich notifications API Native messaging Audio recording and screen capture Use geolocation WebHID in extensions WebUSB in extensions File handling on Chrome OS Unit testing Chrome Extensions End-to-end testing for Chrome Extensions Tutorial: Testing Chrome Extensions with Puppeteer
Protect user privacy Permission warning guidelines Stay secure Accessibility (a11y) Localization message formats Give users options
Extension hosting Alternative extension installation methods Installing extensions on Linux Use Google Analytics 4
About Manifest V2 Getting started
What are extensions? What are themes? Frequently asked questions
Extension development overview Manifest file format Architecture overview Declare permissions Design the user interface Debugging extensions Samples
Message passing Content scripts Manage events with background scripts Match patterns Cross-origin isolation
Cross-origin XMLHttpRequest Using eval in Chrome extensions
Overriding Chrome settings Extending DevTools OAuth2: Authenticate users with Google Overriding Chrome pages Rich notifications API
Protect user privacy Declare permissions and warn users Stay secure Accessibility (a11y) Localization message formats Give users options
Chrome Web Store Alternative extension distribution options Installing extensions on Linux Tutorial: Google analytics

chrome.mdns

This API is part of the Chrome Apps platform, which was deprecated in 2020. It remains supported for Enterprise and Education customers on ChromeOS until at least Jan 2025. Learn more about migrating your app.
  • Description

    Use the chrome.mdns API to discover services over mDNS. This comprises a subset of the features of the NSD spec: http://www.w3.org/TR/discovery-api/

  • Permissions
    mdns
  • Availability
    Chrome 43+

Summary

Types

MDnsService

Properties

  • ipAddress

    string

    The IP address of an mDNS advertised service.

  • serviceData

    string[]

    Metadata for an mDNS advertised service.

  • serviceHostPort

    string

    The host:port pair of an mDNS advertised service.

  • serviceName

    string

    The service name of an mDNS advertised service, ..

Properties

MAX_SERVICE_INSTANCES_PER_EVENT

Chrome 44+

The maximum number of service instances that will be included in onServiceList events. If more instances are available, they may be truncated from the onServiceList event.

Value

2048

Methods

forceDiscovery

chrome.mdns.forceDiscovery(
  callback?: function,
)
Promise Chrome 45+

Immediately issues a multicast DNS query for all service types. callback is invoked immediately. At a later time, queries will be sent, and any service events will be fired.

Parameters

  • callback

    function optional

    The callback parameter looks like: () => void

Returns

  • Promise<void>

    Chrome 96+

    Promises are supported in Manifest V3 and later, but callbacks are provided for backward compatibility. You cannot use both on the same function call. The promise resolves with the same type that is passed to the callback.

Events

onServiceList

chrome.mdns.onServiceList.addListener(
  callback: function,
)

Event fired to inform clients of the current complete set of known available services. Clients should only need to store the list from the most recent event. The service type that the extension is interested in discovering should be specified as the event filter with the 'serviceType' key. Not specifying an event filter will not start any discovery listeners.

Parameters

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