# 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

## Install

Sorry, this isn't ready for you yet.

## 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, 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');
});
```

For edge cases, like POST request to URL with query string or to pass HTTP auth creadentials, 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);
});
```


[xhr2-fd]: http://dev.w3.org/2006/webapi/XMLHttpRequest-2/Overview.html#the-formdata-interface
