Bobby L. Craig

Form-Data

# Form-Data [![Build Status](https://travis-ci.org/felixge/node-form-data.png?branch=master)](https://travis-ci.org/felixge/node-form-data) [![Dependency Status](https://gemnasium.com/felixge/node-form-data.png)](https://gemnasium.com/felixge/node-form-data) A module to create readable ```"multipart/form-data"``` streams. Can be used to submit forms and file uploads to other web applications. The API of this module is inspired by the [XMLHttpRequest-2 FormData Interface][xhr2-fd]. [xhr2-fd]: http://dev.w3.org/2006/webapi/XMLHttpRequest-2/Overview.html#the-formdata-interface [streams2-thing]: http://nodejs.org/api/stream.html#stream_compatibility_with_older_node_versions ## Install ``` npm install form-data ``` ## Usage In this example we are constructing a form with 3 fields that contain a string, a buffer and a file stream. ``` javascript var FormData = require('form-data'); var fs = require('fs'); var form = new FormData(); form.append('my_field', 'my value'); form.append('my_buffer', new Buffer(10)); form.append('my_file', fs.createReadStream('/foo/bar.jpg')); ``` Also you can use http-response stream: ``` javascript var FormData = require('form-data'); var http = require('http'); var form = new FormData(); http.request('http://nodejs.org/images/logo.png', function(response) { form.append('my_field', 'my value'); form.append('my_buffer', new Buffer(10)); form.append('my_logo', response); }); ``` Or @mikeal's request stream: ``` javascript var FormData = require('form-data'); var request = require('request'); var form = new FormData(); form.append('my_field', 'my value'); form.append('my_buffer', new Buffer(10)); form.append('my_logo', request('http://nodejs.org/images/logo.png')); ``` In order to submit this form to a web application, call ```submit(url, [callback])``` method: ``` javascript form.submit('http://example.org/', function(err, res) { // res – response object (http.IncomingMessage) // res.resume(); // for node-0.10.x }); ``` For more advanced request manipulations ```submit()``` method returns ```http.ClientRequest``` object, or you can choose from one of the alternative submission methods. ### Alternative submission methods You can use node's http client interface: ``` javascript var http = require('http'); var request = http.request({ method: 'post', host: 'example.org', path: '/upload', headers: form.getHeaders() }); form.pipe(request); request.on('response', function(res) { console.log(res.statusCode); }); ``` Or if you would prefer the `'Content-Length'` header to be set for you: ``` javascript form.submit('example.org/upload', function(err, res) { console.log(res.statusCode); }); ``` To use custom headers and pre-known length in parts: ``` javascript var CRLF = '\r\n'; var form = new FormData(); var options = { header: CRLF + '--' + form.getBoundary() + CRLF + 'X-Custom-Header: 123' + CRLF + CRLF, knownLength: 1 }; form.append('my_buffer', buffer, options); form.submit('http://example.com/', function(err, res) { if (err) throw err; console.log('Done'); }); ``` Form-Data can recognize and fetch all the required information from common types of streams (```fs.readStream```, ```http.response``` and ```mikeal's request```), for some other types of streams you'd need to provide "file"-related information manually: ``` javascript someModule.stream(function(err, stdout, stderr) { if (err) throw err; var form = new FormData(); form.append('file', stdout, { filename: 'unicycle.jpg', contentType: 'image/jpg', knownLength: 19806 }); form.submit('http://example.com/', function(err, res) { if (err) throw err; console.log('Done'); }); }); ``` For edge cases, like POST request to URL with query string or to pass HTTP auth credentials, object can be passed to `form.submit()` as first parameter: ``` javascript form.submit({ host: 'example.com', path: '/probably.php?extra=params', auth: 'username:password' }, function(err, res) { console.log(res.statusCode); }); ``` In case you need to also send custom HTTP headers with the POST request, you can use the `headers` key in first parameter of `form.submit()`: ``` javascript form.submit({ host: 'example.com', path: '/surelynot.php', headers: {'x-test-header': 'test-header-value'} }, function(err, res) { console.log(res.statusCode); }); ``` ## Notes - ```getLengthSync()``` method DOESN'T calculate length for streams, use ```knownLength``` options as workaround. - If it feels like FormData hangs after submit and you're on ```node-0.10```, please check [Compatibility with Older Node Versions][streams2-thing] ## TODO - Add new streams (0.10) support and try really hard not to break it for 0.8.x. ## License Form-Data is licensed under the MIT license.