Unfancy evented multipart form request parser.
JavaScript
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README.md

multipartser

mutipartser is an evented multipart form submission parser.

Installation

npm install multipartser

Usage

Below gets complicated, but so does multipart parsing. Please let me know if you find any errors.

The first half just extracts the boundary from the Content-Type header. The second half is the one that actually does the parsing.

var http = require( 'http' ),
    multipartser = require( 'multipartser' );

http.createServer( function ( req, res ) {

  // get boundary from 'Content-Type' header
  var contentType = req.headers && req.headers[ 'Content-Type' ];
  if ( ! contentType ) {
    res.writeHead( 400 ); // Missing Content-Type
    res.end();
    return;
  }

  var contentTypeParts = contentType.split( ';' );
  if ( contentTypeParts.length != 2 ) {
    res.writeHead( 400 );
    res.end();
    return;
  }

  contentType = contentTypeParts[ 0 ];

  if ( contentType != 'multipart/form-data' ) {
    res.writeHead( 415 ); // Unsupported Media Type
    res.end();
    return;
  }

  var boundary = contentTypeParts[ 1 ];
  boundary = boundary.trim().split( '=' );

  if ( boundary.length != 2 ) {
    res.writeHead( 400 ); // Missing multipart boundary
    res.end();
    return;
  }

  boundary = boundary[ 1 ];

  var parser = multipartser(); // finally.. geesh
  parser.boundary( boundary );

  parser.on( 'part', function ( part ) {

    if ( part.type == 'file' ) {

      console.log( 'type', part.type );
      console.log( 'name', part.name );
      console.log( 'filename', part.filename );
      console.log( 'contents', part.contents );
      console.log( 'contentType', part.contentType );

    } else if ( part.type == 'field' ) {

      console.log( 'type', part.type );
      console.log( 'name', part.name );
      console.log( 'value', part.value );

    } // else if ( part.type == 'field' )

  }); // parser.on 'part'

  parser.on( 'end', function () {
    console.log( 'completed parsing' );
  }); // parser.on 'end'

  parser.on( 'error', function ( error ) {
    console.error( error );
  }); // parser.on 'error'

  req.setEncoding( 'utf8' );
  req.on( 'data', parser.data );
  req.on( 'end', parser.end );

}).listen( 1337, '127.0.0.1' );