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express-fileupload

Simple express middleware for uploading files.

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Help us Improve express-fileupload

This package is still very much supported and maintained. But the more help the better. If you're interested any of the following:

...please contact richardgirges '-at-' gmail.com

Install

# With NPM
npm i express-fileupload

# With Yarn
yarn add express-fileupload

Usage

When you upload a file, the file will be accessible from req.files.

Example:

app.post('/upload', function(req, res) {
  console.log(req.files.foo); // the uploaded file object
});

The req.files.foo object will contain the following:

Notes about breaking changes with MD5 handling:

Examples

Using Busboy Options

Pass in Busboy options directly to the express-fileupload middleware. Check out the Busboy documentation here.

app.use(fileUpload({
  limits: { fileSize: 50 * 1024 * 1024 },
}));

Using useTempFile Options

Use temp files instead of memory for managing the upload process.

// Note that this option available for versions 1.0.0 and newer. 
app.use(fileUpload({
    useTempFiles : true,
    tempFileDir : '/tmp/'
}));

Using debug option

You can set debug option to true to see some logging about upload process. In this case middleware uses console.log and adds Express-file-upload prefix for outputs. You can set a custom logger having .log() method to the logger option.

It will show you whether the request is invalid and also common events triggered during upload. That can be really useful for troubleshooting and we recommend attaching debug output to each issue on Github.

Output example:

Express-file-upload: Temporary file path is /node/express-fileupload/test/temp/tmp-16-1570084843942
Express-file-upload: New upload started testFile->car.png, bytes:0
Express-file-upload: Uploading testFile->car.png, bytes:21232...
Express-file-upload: Uploading testFile->car.png, bytes:86768...
Express-file-upload: Upload timeout testFile->car.png, bytes:86768
Express-file-upload: Cleaning up temporary file /node/express-fileupload/test/temp/tmp-16-1570084843942...

Description:

Available Options

Pass in non-Busboy options directly to the middleware. These are express-fileupload specific options.

OptionAcceptable ValuesDetails
createParentPath<ul><li><code>false</code> (default)</li><li><code>true</code></ul>Automatically creates the directory path specified in .mv(filePathName)
uriDecodeFileNames<ul><li><code>false</code> (default)</li><li><code>true</code></ul>Applies uri decoding to file names if set true.
safeFileNames<ul><li><code>false</code> (default)</li><li><code>true</code></li><li>regex</li></ul>Strips characters from the upload's filename. You can use custom regex to determine what to strip. If set to true, non-alphanumeric characters except dashes and underscores will be stripped. This option is off by default.<br /><br />Example #1 (strip slashes from file names): app.use(fileUpload({ safeFileNames: /\\/g }))<br />Example #2: app.use(fileUpload({ safeFileNames: true }))
preserveExtension<ul><li><code>false</code> (default)</li><li><code>true</code></li><li><code>Number</code></li></ul>Preserves filename extension when using <code>safeFileNames</code> option. If set to <code>true</code>, will default to an extension length of 3. If set to <code>Number</code>, this will be the max allowable extension length. If an extension is smaller than the extension length, it remains untouched. If the extension is longer, it is shifted.<br /><br />Example #1 (true):<br /><code>app.use(fileUpload({ safeFileNames: true, preserveExtension: true }));</code><br />myFileName.ext --> myFileName.ext<br /><br />Example #2 (max extension length 2, extension shifted):<br /><code>app.use(fileUpload({ safeFileNames: true, preserveExtension: 2 }));</code><br />myFileName.ext --> myFileNamee.xt
abortOnLimit<ul><li><code>false</code> (default)</li><li><code>true</code></ul>Returns a HTTP 413 when the file is bigger than the size limit if true. Otherwise, it will add a <code>truncated = true</code> to the resulting file structure.
responseOnLimit<ul><li><code>'File size limit has been reached'</code> (default)</li><li><code>String</code></ul>Response which will be send to client if file size limit exceeded when abortOnLimit set to true.
limitHandler<ul><li><code>false</code> (default)</li><li><code>function(req, res, next)</code></li></ul>User defined limit handler which will be invoked if the file is bigger than configured limits.
useTempFiles<ul><li><code>false</code> (default)</li><li><code>true</code></ul>By default this module uploads files into RAM. Setting this option to True turns on using temporary files instead of utilising RAM. This avoids memory overflow issues when uploading large files or in case of uploading lots of files at same time.
tempFileDir<ul><li><code>String</code> (path)</li></ul>Path to store temporary files.<br />Used along with the <code>useTempFiles</code> option. By default this module uses 'tmp' folder in the current working directory.<br />You can use trailing slash, but it is not necessary.
parseNested<ul><li><code>false</code> (default)</li><li><code>true</code></li></ul>By default, req.body and req.files are flattened like this: <code>{'name': 'John', 'hobbies[0]': 'Cinema', 'hobbies[1]': 'Bike'}</code><br /><br/>When this option is enabled they are parsed in order to be nested like this: <code>{'name': 'John', 'hobbies': ['Cinema', 'Bike']}</code>
debug<ul><li><code>false</code> (default)</li><li><code>true</code></ul>Turn on/off upload process logging. Can be useful for troubleshooting.
logger<ul><li><code>console</code> (default)</li><li><code>{log: function(msg: string)}</code></li></ul>Customizable logger to write debug messages to. Console is default.
uploadTimeout<ul><li><code>60000</code> (default)</li><li><code>Integer</code></ul>This defines how long to wait for data before aborting. Set to 0 if you want to turn off timeout checks.
hashAlgorithm<ul><li><code>md5</code> (default)</li><li><code>String</code></li></ul>Allows the usage of alternative hashing algorithms for file integrity checks. This option must be an algorithm that is supported on the running system's installed OpenSSL version. On recent releases of OpenSSL, <code>openssl list -digest-algorithms</code> will display the available digest algorithms.

Help Wanted

Looking for additional maintainers. Please contact richardgirges [ at ] gmail.com if you're interested. Pull Requests are welcome!

Thanks & Credit

Brian White for his stellar work on the Busboy Package and the connect-busboy Package