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+# busboy
+
+<div align="center">
+
+[![Build Status](https://github.com/fastify/busboy/workflows/ci/badge.svg)](https://github.com/fastify/busboy/actions)
+[![Coverage Status](https://coveralls.io/repos/fastify/busboy/badge.svg?branch=master)](https://coveralls.io/r/fastify/busboy?branch=master)
+[![js-standard-style](https://img.shields.io/badge/code%20style-standard-brightgreen.svg?style=flat)](https://standardjs.com/)
+[![Security Responsible Disclosure](https://img.shields.io/badge/Security-Responsible%20Disclosure-yellow.svg)](https://github.com/nodejs/security-wg/blob/HEAD/processes/responsible_disclosure_template.md)
+
+</div>
+
+<div align="center">
+
+[![NPM version](https://img.shields.io/npm/v/@fastify/busboy.svg?style=flat)](https://www.npmjs.com/package/@fastify/busboy)
+[![NPM downloads](https://img.shields.io/npm/dm/@fastify/busboy.svg?style=flat)](https://www.npmjs.com/package/@fastify/busboy)
+
+</div>
+
+Description
+===========
+
+A Node.js module for parsing incoming HTML form data.
+
+This is an officially supported fork by [fastify](https://github.com/fastify/) organization of the amazing library [originally created](https://github.com/mscdex/busboy) by Brian White,
+aimed at addressing long-standing issues with it.
+
+Benchmark (Mean time for 500 Kb payload, 2000 cycles, 1000 cycle warmup):
+
+| Library | Version | Mean time in nanoseconds (less is better) |
+|-----------------------|---------|-------------------------------------------|
+| busboy | 0.3.1 | `340114` |
+| @fastify/busboy | 1.0.0 | `270984` |
+
+[Changelog](https://github.com/fastify/busboy/blob/master/CHANGELOG.md) since busboy 0.31.
+
+Requirements
+============
+
+* [Node.js](http://nodejs.org/) 10+
+
+
+Install
+=======
+
+ npm i @fastify/busboy
+
+
+Examples
+========
+
+* Parsing (multipart) with default options:
+
+```javascript
+const http = require('node:http');
+const { inspect } = require('node:util');
+const Busboy = require('busboy');
+
+http.createServer((req, res) => {
+ if (req.method === 'POST') {
+ const busboy = new Busboy({ headers: req.headers });
+ busboy.on('file', (fieldname, file, filename, encoding, mimetype) => {
+ console.log(`File [${fieldname}]: filename: ${filename}, encoding: ${encoding}, mimetype: ${mimetype}`);
+ file.on('data', data => {
+ console.log(`File [${fieldname}] got ${data.length} bytes`);
+ });
+ file.on('end', () => {
+ console.log(`File [${fieldname}] Finished`);
+ });
+ });
+ busboy.on('field', (fieldname, val, fieldnameTruncated, valTruncated, encoding, mimetype) => {
+ console.log(`Field [${fieldname}]: value: ${inspect(val)}`);
+ });
+ busboy.on('finish', () => {
+ console.log('Done parsing form!');
+ res.writeHead(303, { Connection: 'close', Location: '/' });
+ res.end();
+ });
+ req.pipe(busboy);
+ } else if (req.method === 'GET') {
+ res.writeHead(200, { Connection: 'close' });
+ res.end(`<html><head></head><body>
+ <form method="POST" enctype="multipart/form-data">
+ <input type="text" name="textfield"><br>
+ <input type="file" name="filefield"><br>
+ <input type="submit">
+ </form>
+ </body></html>`);
+ }
+}).listen(8000, () => {
+ console.log('Listening for requests');
+});
+
+// Example output, using http://nodejs.org/images/ryan-speaker.jpg as the file:
+//
+// Listening for requests
+// File [filefield]: filename: ryan-speaker.jpg, encoding: binary
+// File [filefield] got 11971 bytes
+// Field [textfield]: value: 'testing! :-)'
+// File [filefield] Finished
+// Done parsing form!
+```
+
+* Save all incoming files to disk:
+
+```javascript
+const http = require('node:http');
+const path = require('node:path');
+const os = require('node:os');
+const fs = require('node:fs');
+
+const Busboy = require('busboy');
+
+http.createServer(function(req, res) {
+ if (req.method === 'POST') {
+ const busboy = new Busboy({ headers: req.headers });
+ busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
+ var saveTo = path.join(os.tmpdir(), path.basename(fieldname));
+ file.pipe(fs.createWriteStream(saveTo));
+ });
+ busboy.on('finish', function() {
+ res.writeHead(200, { 'Connection': 'close' });
+ res.end("That's all folks!");
+ });
+ return req.pipe(busboy);
+ }
+ res.writeHead(404);
+ res.end();
+}).listen(8000, function() {
+ console.log('Listening for requests');
+});
+```
+
+* Parsing (urlencoded) with default options:
+
+```javascript
+const http = require('node:http');
+const { inspect } = require('node:util');
+
+const Busboy = require('busboy');
+
+http.createServer(function(req, res) {
+ if (req.method === 'POST') {
+ const busboy = new Busboy({ headers: req.headers });
+ busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
+ console.log('File [' + fieldname + ']: filename: ' + filename);
+ file.on('data', function(data) {
+ console.log('File [' + fieldname + '] got ' + data.length + ' bytes');
+ });
+ file.on('end', function() {
+ console.log('File [' + fieldname + '] Finished');
+ });
+ });
+ busboy.on('field', function(fieldname, val, fieldnameTruncated, valTruncated) {
+ console.log('Field [' + fieldname + ']: value: ' + inspect(val));
+ });
+ busboy.on('finish', function() {
+ console.log('Done parsing form!');
+ res.writeHead(303, { Connection: 'close', Location: '/' });
+ res.end();
+ });
+ req.pipe(busboy);
+ } else if (req.method === 'GET') {
+ res.writeHead(200, { Connection: 'close' });
+ res.end('<html><head></head><body>\
+ <form method="POST">\
+ <input type="text" name="textfield"><br />\
+ <select name="selectfield">\
+ <option value="1">1</option>\
+ <option value="10">10</option>\
+ <option value="100">100</option>\
+ <option value="9001">9001</option>\
+ </select><br />\
+ <input type="checkbox" name="checkfield">Node.js rules!<br />\
+ <input type="submit">\
+ </form>\
+ </body></html>');
+ }
+}).listen(8000, function() {
+ console.log('Listening for requests');
+});
+
+// Example output:
+//
+// Listening for requests
+// Field [textfield]: value: 'testing! :-)'
+// Field [selectfield]: value: '9001'
+// Field [checkfield]: value: 'on'
+// Done parsing form!
+```
+
+
+API
+===
+
+_Busboy_ is a _Writable_ stream
+
+Busboy (special) events
+-----------------------
+
+* **file**(< _string_ >fieldname, < _ReadableStream_ >stream, < _string_ >filename, < _string_ >transferEncoding, < _string_ >mimeType) - Emitted for each new file form field found. `transferEncoding` contains the 'Content-Transfer-Encoding' value for the file stream. `mimeType` contains the 'Content-Type' value for the file stream.
+ * Note: if you listen for this event, you should always handle the `stream` no matter if you care about the file contents or not (e.g. you can simply just do `stream.resume();` if you want to discard the contents), otherwise the 'finish' event will never fire on the Busboy instance. However, if you don't care about **any** incoming files, you can simply not listen for the 'file' event at all and any/all files will be automatically and safely discarded (these discarded files do still count towards `files` and `parts` limits).
+ * If a configured file size limit was reached, `stream` will both have a boolean property `truncated` (best checked at the end of the stream) and emit a 'limit' event to notify you when this happens.
+ * The property `bytesRead` informs about the number of bytes that have been read so far.
+
+* **field**(< _string_ >fieldname, < _string_ >value, < _boolean_ >fieldnameTruncated, < _boolean_ >valueTruncated, < _string_ >transferEncoding, < _string_ >mimeType) - Emitted for each new non-file field found.
+
+* **partsLimit**() - Emitted when specified `parts` limit has been reached. No more 'file' or 'field' events will be emitted.
+
+* **filesLimit**() - Emitted when specified `files` limit has been reached. No more 'file' events will be emitted.
+
+* **fieldsLimit**() - Emitted when specified `fields` limit has been reached. No more 'field' events will be emitted.
+
+
+Busboy methods
+--------------
+
+* **(constructor)**(< _object_ >config) - Creates and returns a new Busboy instance.
+
+ * The constructor takes the following valid `config` settings:
+
+ * **headers** - _object_ - These are the HTTP headers of the incoming request, which are used by individual parsers.
+
+ * **autoDestroy** - _boolean_ - Whether this stream should automatically call .destroy() on itself after ending. (Default: false).
+
+ * **highWaterMark** - _integer_ - highWaterMark to use for this Busboy instance (Default: WritableStream default).
+
+ * **fileHwm** - _integer_ - highWaterMark to use for file streams (Default: ReadableStream default).
+
+ * **defCharset** - _string_ - Default character set to use when one isn't defined (Default: 'utf8').
+
+ * **preservePath** - _boolean_ - If paths in the multipart 'filename' field shall be preserved. (Default: false).
+
+ * **isPartAFile** - __function__ - Use this function to override the default file detection functionality. It has following parameters:
+
+ * fieldName - __string__ The name of the field.
+
+ * contentType - __string__ The content-type of the part, e.g. `text/plain`, `image/jpeg`, `application/octet-stream`
+
+ * fileName - __string__ The name of a file supplied by the part.
+
+ (Default: `(fieldName, contentType, fileName) => (contentType === 'application/octet-stream' || fileName !== undefined)`)
+
+ * **limits** - _object_ - Various limits on incoming data. Valid properties are:
+
+ * **fieldNameSize** - _integer_ - Max field name size (in bytes) (Default: 100 bytes).
+
+ * **fieldSize** - _integer_ - Max field value size (in bytes) (Default: 1 MiB, which is 1024 x 1024 bytes).
+
+ * **fields** - _integer_ - Max number of non-file fields (Default: Infinity).
+
+ * **fileSize** - _integer_ - For multipart forms, the max file size (in bytes) (Default: Infinity).
+
+ * **files** - _integer_ - For multipart forms, the max number of file fields (Default: Infinity).
+
+ * **parts** - _integer_ - For multipart forms, the max number of parts (fields + files) (Default: Infinity).
+
+ * **headerPairs** - _integer_ - For multipart forms, the max number of header key=>value pairs to parse **Default:** 2000
+
+ * **headerSize** - _integer_ - For multipart forms, the max size of a multipart header **Default:** 81920.
+
+ * The constructor can throw errors:
+
+ * **Busboy expected an options-Object.** - Busboy expected an Object as first parameters.
+
+ * **Busboy expected an options-Object with headers-attribute.** - The first parameter is lacking of a headers-attribute.
+
+ * **Limit $limit is not a valid number** - Busboy expected the desired limit to be of type number. Busboy throws this Error to prevent a potential security issue by falling silently back to the Busboy-defaults. Potential source for this Error can be the direct use of environment variables without transforming them to the type number.
+
+ * **Unsupported Content-Type.** - The `Content-Type` isn't one Busboy can parse.
+
+ * **Missing Content-Type-header.** - The provided headers don't include `Content-Type` at all.