![]() MimeType - string - The file's 'Content-Type' value. You are better off generating your own (safe) filenames, or at the very least using a hash of the filename.Įncoding - string - The file's 'Content-Transfer-Encoding' value. WARNING: You should almost never use this value as-is (especially if you are using preservePath: true in your config) as it could contain malicious input. info contains the following properties:įilename - string - If supplied, this contains the file's filename. base64 to raw binary) are done on the file's data. stream is a Readable stream containing the file's data. ![]() (Special) Parser stream eventsįile(name, stream, info) - Emitted for each new file found. For example, if the Content-Type in headers is missing entirely, is not a supported type, or is missing the boundary for 'multipart/form-data' requests. This function can throw exceptions if there is something wrong with the values in config. Default: 2000 (same as node's http module). HeaderPairs - integer - For multipart forms, the max number of header key-value pairs to parse. Parts - integer - For multipart forms, the max number of parts (fields + files). Default: Infinity.įiles - integer - For multipart forms, the max number of file fields. Default: Infinity.įileSize - integer - For multipart forms, the max file size (in bytes). Default: 1048576 (1MB).įields - integer - Max number of non-file fields. Default: 100.įieldSize - integer - Max field value size (in bytes). Valid properties are:įieldNameSize - integer - Max field name size (in bytes). Limits - object - Various limits on incoming data. PreservePath - boolean - If paths in filenames from file parts in a 'multipart/form-data' request shall be preserved. filename) that are not extended parameters (that contain an explicit charset). Default: 'utf8'.ĭefParamCharset - string - For multipart forms, the default character set to use for values of part header parameters (e.g. Default: node's stream.Readable default.ĭefCharset - string - Default character set to use when one isn't defined. Default: node's stream.Writable default.įileHwm - integer - highWaterMark to use for individual file streams. HighWaterMark - integer - highWaterMark to use for the parser stream. Headers - object - These are the HTTP headers of the incoming request, which are used by individual parsers. ( function )(config) - Creates and returns a new Writable form parser stream. createServer ( ( req, res ) => ) API Exports Maybe you just want to read and process the uploaded file, but not actually write it to the file system.Const http = require ( 'http' ) const busboy = require ( 'busboy' ) http. Then use fs.writeFile("path/to/file.jpg", buffer) to write the file to the file system.First convert the ReadStream to a Buffer. ![]() This option is useful when you want to write the uploaded file to the local file system. ( More on ReadSteam)ĭepending on the use case, you can commonly approach a file upload in two ways. lib/middleware.js import asyncBusboy from "async-busboy" export default Middleware ( handler ) => async ( req, res ) => ) Reading the Uploaded Filesĭisclaimer: this section assumes you have some background with Node Streams and Buffers.īusboy returns a NodeJS ReadStream for each file. ![]() Passed to busboy so it can process the uploaded files and give us back something we can use. When those requirements are met, the req object is This middleware is designed to look for POST requests with a file upload content type. We're going to create a Middleware that extends the functionality of our Next.js API routes. I'll be using a custom middleware in this example to handle file uploads. If you haven't yet stumbled upon my post on Using Middleware with Next.js. You can read more about async-busboy here Before we kick things off. You'll need need to install the async-busboy NPM package: npm i async-busboyĪsyncBusboy is a simple async wrapper around the main library, busboy. Next.js doesn't come with any built-in support for file uploads, but it's surprisingly easy to setup with a helpful library. ![]()
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