Description
A node.js module for parsing incoming HTML form data.
Requirements
Install
npm install busboy
Examples
- Parsing (multipart) with default options:
var http = require('http'),
inspect = require('util').inspect;
var Busboy = require('busboy');
http.createServer(function(req, res) {
if (req.method === 'POST') {
var busboy = new Busboy({ headers: req.headers });
busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
console.log('File [' + fieldname +']: filename: ' + filename + ', encoding: ' + encoding);
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, valTruncated, keyTruncated) {
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" enctype="multipart/form-data">\
<input type="text" name="textfield"><br />\
<input type="file" name="filefield"><br />\
<input type="submit">\
</form>\
</body></html>');
}
}).listen(8000, function() {
console.log('Listening for requests');
});
- Save all incoming files to disk:
var http = require('http'),
os = require('os');
var Busboy = require('busboy');
http.createServer(function(req, res) {
if (req.method === 'POST') {
var 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:
var http = require('http'),
inspect = require('util').inspect;
var Busboy = require('busboy');
http.createServer(function(req, res) {
if (req.method === 'POST') {
var 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, valTruncated, keyTruncated) {
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');
});
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 that you should always handle the
stream
, whether you care about the file data or not (e.g. you can simply just do stream.resume();
if you don't care about the contents), otherwise the 'finish' event will never fire on the Busboy instance. stream
also has a boolean property 'truncated', which indicates if the file stream was truncated because a configured file size limit was reached. It's probably best to check this value at the end of the stream.
-
field(< string >fieldname, < string >value, < boolean >fieldnameTruncated, < boolean >valueTruncated) - 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