### Installing eventsource-encoder Package - Bash

Source: https://github.com/rexxars/eventsource-encoder/blob/main/README.md

This command installs the `eventsource-encoder` package from npm, saving it as a dependency in the project's `package.json` file. It is the first step to integrate the utility into a Node.js project.

```bash
npm install --save eventsource-encoder
```

--------------------------------

### Creating Server-Sent Events Endpoint with eventsource-encoder - JavaScript

Source: https://github.com/rexxars/eventsource-encoder/blob/main/README.md

This example demonstrates how to set up a basic HTTP server that streams Server-Sent Events using `eventsource-encoder`. It configures the response headers for `text/event-stream` and then sends 100 time-based events, each encoded with an `id`, `event` type, and `data` payload, ensuring proper SSE formatting.

```javascript
import {createServer} from 'node:http'
import {encode} from 'eventsource-encoder'

createServer((req, res) => {
  res.writeHead(200, {
    'Content-Type': 'text/event-stream',
    'Cache-Control': 'no-cache'
  })

  for (let id = 0; id < 100; id++) {
    res.write(
      encode({
        id,
        event: 'time',
        data: new Date().toISOString()
      })
    )
  }
})
```

--------------------------------

### Encoding Comments for Server-Sent Events - JavaScript

Source: https://github.com/rexxars/eventsource-encoder/blob/main/README.md

This example shows how to use the `encodeComment` function to create Server-Sent Events comments. Comments, prefixed with a colon (`:`), can be used for debugging or heartbeats, and this function correctly formats both single-line and multi-line strings into valid SSE comment lines.

```javascript
import {encodeComment} from 'eventsource-encoder'

console.log(encodeComment('This is a comment')) // : This is a comment\n
console.log(encodeComment('This\nis\na\nmultiline\ncomment')) // : This\n: is\n: a\n: multiline\n: comment\n
```

--------------------------------

### Encoding Raw Data for Server-Sent Events - JavaScript

Source: https://github.com/rexxars/eventsource-encoder/blob/main/README.md

This snippet illustrates the use of the `encodeData` function to format raw string data into Server-Sent Events data lines. It correctly handles single-line and multi-line inputs, ensuring that newlines within the data are properly prefixed with `data:` for valid SSE output.

```javascript
import {encodeData} from 'eventsource-encoder'

console.log(encodeData('Hello, world!')) // data: Hello, world!\n\n
console.log(encodeData('Hello\nworld!')) // data: Hello\ndata: world!\n\n
```

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