This is a simple Nest.js application demonstrating the use of Server-Sent Events (SSE) to send real-time notifications to clients. The project includes a basic backend service to handle notifications and a frontend example to display them.

• Backend: A Nest.js server that provides endpoints to post notifications and stream notifications to clients in real-time using SSE.
• Frontend: A simple HTML page to demonstrate receiving notifications in real-time and displaying them with a notification badge.

1. Clone the repository:

   git clone git@github.com:peterkracik/nestjs-server-sent-events.git
   cd nestjs-server-sent-events

2. Install the dependencies:

   yarn install

1. Start the Nest.js server:

   yarn start:dev

   The server will run on http://localhost:3000. Provide a query parameter user to the frontend to specify the user ID. For example, http://localhost:3000/?user=1.

• Description: Receives a new notification and adds it to the store.
• Request Body:

{
  "message": "string",
  "userId": "string"
}

• Description: Returns all notifications for a given user.
• Parameters:
• id: User ID

• Description: Returns a stream of notifications for a given user.
• Parameters:
• id: User ID

The frontend is a simple HTML page using Tailwind CSS for styling. It demonstrates how to:

• Send notifications via a form.
• Display notifications count using a badge.
• Receive real-time notifications using SSE.

1. Open the http://localhost:3000/?user=1 file in a browser.
2. Use the form to send notifications to a user.
3. The notification count badge will update in real-time as new notifications are received.

• @nestjs/common: Core Nest.js components.
• @nestjs/event-emitter: Used to emit and listen to events within the application.
• rxjs: Library for reactive programming using Observables.

This project is licensed under the MIT License.