Express Large File Upload/Download

This is an example project that demonstrates how to upload and download large files using Express, as well as how to handle range requests for resuming downloads. The project uses the multer middleware for handling file uploads, and the fs module for reading and writing files. The code supports files up to 5 GB in size.

Getting Started

Clone the repository:

git clone https://github.com/melikaShojaee/express-large-file-upload-download.git

Install dependencies:

cd express-large-file-upload-download
npm install

Start the server:
```
npm start
```
Open your web browser and navigate to [http://localhost:3000].

Usage

Uploading a File

To upload a file, send a POST request to the /upload endpoint with the file attached as a multipart/form-data payload. The file field should contain the file to be uploaded. For example, using the curl command:

curl -X POST -F file=@path/to/file.ext http://localhost:3000/upload

If the upload is successful, the server will respond with a status code of 200 and a JSON object containing a success message:

{
  "message": "File filename.ext uploaded successfully"
}

If there was an error with the upload, the server will respond with a status code of 400 and a JSON object containing an error message:

{
  "message": "No file uploaded"
}

Downloading a File

To download a file, send a GET request to the /download/:id endpoint, where id is the name of the file you wish to download. For example:

http://localhost:4000/download/filename.ext

If the file exists, the server will respond with a status code of 200 and send the file as an octet-stream attachment. If the file does not exist, the server will respond with a status code of 404.

The code also supports range requests for resuming downloads. If the client sends a Range header with the request, the server will respond with a partial content (206) status code and the appropriate Content-Range header. For example:

Range: bytes=0-1023

This will request the first 1024 bytes of the file. The server will respond with a Content-Range header like this:

Content-Range: bytes 0-1023/10000

And will send the requested bytes in the response body.

Configuration

The following configuration options are available:

Option	Default	Description
`PORT`	`3000`	The port to run the server on
`FILE_UPLOAD_PATH`	`./public/assets/uploads`	The directory to store uploaded files in

To override a configuration option, set the corresponding environment variable before starting the server.

Elijah-glitch / express-large-file-upload-download