The headless version of Novu’s notification library package provides users with a lightweight solution for integrating notification functionality into their web applications. With just the essential API methods, users can easily incorporate our notification system into any framework or vanilla JavaScript project, without being constrained by our default UI or dependencies.

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Installation

npm install @novu/headless
Then, in your project import the headless service: 
import { HeadlessService, FetchResult, ISession } from '@novu/headless';

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Initialize the session

To use the headless service and its features, you’ll need to first initialize the session: 
const headlessService = new HeadlessService({
  applicationIdentifier: "APPLICATION_IDENTIFIER",
  subscriberId: "SUBSCRIBER_ID",
});

headlessService.initializeSession({
  listener: (res: FetchResult<ISession>) => {
    console.log(res);
  },
  onSuccess: (session: ISession) => {
    console.log(session);
  },
  onError: (error) => {
    console.error(error);
  },
});

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Use your own backend and socket url

By default, Novu’s hosted services of API and socket are used. Should you want, you could override them and configure your own. 
const headlessService = new HeadlessService({
  applicationIdentifier: "APPLICATION_IDENTIFIER",
  subscriberId: "SUBSCRIBER_ID",
  backendUrl: "YOUR_BACKEND_URL",
  socketUrl: "YOUR_SOCKET_URL",
});

headlessService.initializeSession({
  listener: (session) => {
    console.log(session);
  },
  onSuccess: (session) => {
    console.log(session);
  },
  onError: (error) => {
    console.error(error);
  },
});

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Fetch Notifications

import { IPaginatedResponse, IMessage } from "@novu/headless";

headlessService.fetchNotifications({
  listener: ({ data, error, isError, isFetching, isLoading, status }) => {
    console.log({ data, error, isError, isFetching, isLoading, status });
  },
  onSuccess: (response: IPaginatedResponse<IMessage>) => {
    console.log(
      response.data,
      response.page,
      response.totalCount,
      response.pageSize
    );
  },
  page: 1, // page number to be fetched
});
fetchNotifications and other methods of the headless service should be used after initializing the session using headlessService.initializeSession

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HMAC Encryption

To use the Hash-Based Message Authentication Codes pass the HMAC code to the headless service: 
const headlessService = new HeadlessService({
  applicationIdentifier: "APP_ID_FROM_ADMIN_PANEL",
  subscriberId: "USER_ID",
  subscriberHash: "HASHED_SUBSCRIBER_ID",
});

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Realtime Sockets

Novu headless library provides listenUnseenCountChange API to listen to real-time socket changes and get updates about new notifications added to the user’s feed.

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unseen count changes

headlessService.listenUnseenCountChange({
  // this will run every time there's a change in the `unseen_count` in real-time
  listener: (unseenCount: number) => {
    console.log(unseenCount);
  },
});

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unread count changes

headlessService.listenUnreadCountChange({
  // this will run every time there's a change in the `unread_count` in real-time
  listener: (unreadCount: number) => {
    console.log(unreadCount);
  },
});
If you’re ready to start using the Headless Notification Center, check out our guide!
Explore Implementation of the Headless Library in an App Headless Demo

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Frequently Asked Questions