Hi folks, in this blog we will build a Node.js video streaming application in like 10 minutes.

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 ![install Node.js in your computer](https://cdn.hackernoon.com/images/cl-0-c-7-yfph-00670-as-626-orhi-04.jpg)

### Prerequisite

* install Node.js on your computer

## What is streaming?

Streams are collections of data — just like arrays or strings. The difference is that streams might not be available all at once, and they don’t have to fit in memory. This makes streams really powerful when working with large amounts of data, or data that’s coming from an external source one chunk at a time.

## Setup \[ 1 \] - getting started

1 - create a folder and name it `vido-streaming`
2 - initialize npm in your project `npm init -y` 

3 - install these packages dependencies.

\
```
#### npm install express
```

#### development dependencies.

```
npm install -D nodemon
```

#### add this script to your `package.json` file.

```json
"start": "nodemon index.js"
```

## Setup \[2\]  - setup Node.js server

1 - create `index.js` file in your project root.
2 - add this code below

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```js 
const express = require("express");

const app = express(); // setup express application
const PORT = process.env.PORT || 3000;

app.listen(PORT, () => {
  console.log("SERVER STARTED AT PORT: " + PORT);
});
```

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This code starts web server using `express` framework and listening to port: `3000`.

## Setup \[3\] - serving html page

Now we want to serve an html page with a video element to the Frontend.

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1 - create `public` folder in your project root.
2 - create `index.html` file in created folder (`public`) and add this html code.

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```html

<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Home | Video Streaming</title>
  </head>
  <body>
    <video 
    controls 
    src="/video" 
    id="video-stream" 
    poster="/poster.jpeg" 
    width="700"
    >
	</video>
  </body>
</html>
```

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* `controls` :  Specifies that video controls should be displayed (such as a play/pause button etc).
* `src` : Specifies the URL of the video file.
* `poster`: Specifies an image to be shown while the video is downloading, or until the user hits the play button.

### Serving html file

we need to send the html page to the users. add this code below in `index.js` file.

```js
app.get("/", (req, res) => {
try {
	res.sendFile(__dirname + "/public/index.html");
} catch (err) {
	res.status(500).send("internal server error occurred")
}
});
```

what that code does, is listening to get request in base URL of the application, when it get the response will be send file by using `sendFile` and first parameter is  html file path.

note:  `__dirname` is the root path of the current directory.

## Serving poster image - setup \[4\]

Poster is image will be shown until the video is downloaded or the user clicks the video. 

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Note: you need to any image you want in a public directory that you make. See the code below

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```js
app.get("/:file_name", (req, res) => {
	try {
		res.sendFile(__dirname + req.params.file_name);
	} catch (err) {
		res.status(500).send("internal server error occurred");
	}
});
```

## Streaming video - setup\[5\] and final

### Import required node.js modules

When streaming the video we need to import two Node.js build-in libraries at the top of the file.

\
```js
const  fs = require("fs");
const  path = require("path");
```

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`fs` : **file system module** allows you to work with the file system on your computer. To include the File System module.

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`path`: **allows you to interact with file paths easily**. The path module has many useful properties and methods to access and manipulate paths in the file system.

### Setup video API function

Add this code before the Serving Poster Image function because Nodejs will go throw the express middlewares and if the requested URL is `/video`  it will match the Serving Poster Image middleware, not the video middleware. 

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Note: you need to add a random video in the public file.

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```js
app.get("/video", (req, res) => {
// indicates the part of a document that the server should return
// on this measure in bytes for example: range = 0-6 bytes.
const  range = req.headers.range;
if (!range) res.status(400).send("Range must be provided");

const  videoPath = path.join(__dirname, "public", "video.mp4");
// extract video size by using statSyn()
const  videoSize = fs.statSync(videoPath).size;
// 10 powered by 6 equal 1000000bytes = 1mb
const  chunkSize = 10 ** 6; 

// calculating video where to start and where to end.
const  start = Number(range.replace(/\D/g, ""));
const  end = Math.min(start + chunkSize, videoSize - 1);
const  contentLength = end - start + 1;

// setup video headers
const  headers = {
"Content-Range":  `bytes ${start}-${end}/${videoSize}`,
"Accept-Ranges":  "bytes",
"Content-Length":  contentLength,
"Content-Type":  "video/mp4",
};

res.writeHead(206, headers);
// creating readStream (stdin).
const  videoStream = fs.createReadStream(videoPath, { start, end });

// create live stream pipe line
videoStream.pipe(res);
});
```

### And then run ` npm run start`. to see your work.

## What is pipe() in streaming?

Streams make for quite a handy abstraction, and there's a lot you can do with them - as an example,  `stream.pipe()`, the method used to take a readable stream and connect it to a writeable stream. the writable stream is the user we request him the data buffers.

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Project source code: <https://github.com/alguerocode/video-streaming> 

Follow me on GitHub: [alguerocode](https://github.com/alguerocode)

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Thank you for reading.

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