node.js - Node Multer unexpected field -

i'm working on uploading file app using multer npm module.

the multer function have defined allow single file uploaded file system. works during run time; issue after upload file error below. advice appreciated on look.

error:

unexpected field  error: unexpected field     @ makeerror (c:\users\dev\webstormprojects\crunch\node_modules\multer\lib\make-error.js:12:13)     @ wrappedfilefilter (c:\users\dev\webstormprojects\crunch\node_modules\multer\index.js:39:19)     @ busboy.<anonymous> (c:\users\dev\webstormprojects\crunch\node_modules\multer\lib\make-middleware.js:97:7)     @ busboy.emit (events.js:118:17)     @ busboy.emit (c:\users\dev\webstormprojects\crunch\node_modules\multer\node_modules\busboy\lib\main.js:31:35)     @ partstream.<anonymous> (c:\users\dev\webstormprojects\crunch\node_modules\multer\node_modules\busboy\lib\types\multipart.js:205:13)     @ partstream.emit (events.js:107:17)     @ headerparser.<anonymous> (c:\users\dev\webstormprojects\crunch\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\dicer.js:51:16)     @ headerparser.emit (events.js:107:17)     @ headerparser._finish (c:\users\dev\webstormprojects\crunch\node_modules\multer\node_modules\busboy\node_modules\dicer\lib\headerparser.js:70:8)  

app.js

var multer = require('multer'); var app = express(); var fs = require('fs');  //. . .   var upload = multer({ dest: 'upload/'}); var type = upload.single('file');  app.post('/upload', type, function (req,res) {   var tmp_path = req.files.recfile.path;   var target_path = 'uploads/' + req.files.recfile.name; fs.readfile(tmp_path, function(err, data) {   fs.writefile(target_path, data, function (err)   {     res.render('complete');   }) }); 

index.hbs

<form action="/upload" method="post" enctype="multipart/form-data">     <input type="file" name='recfile' placeholder="select file"/>     <br/>     <button>upload</button> </form>  #package.json   "dependencies": {     "body-parser": "~1.13.2",     "cookie-parser": "~1.3.5",     "debug": "~2.2.0",     "easy-zip": "0.0.4",     "express": "~4.13.1",     "hbs": "~3.1.0",     "less-middleware": "1.0.x",     "morgan": "~1.6.1",     "multer": "~1.0.0",     "serve-favicon": "~2.3.0"   } } 

var multer  = require('multer'); var upload = multer({ dest: 'upload/'}); var fs = require('fs');  /** permissible loading single file,      value of attribute "name" in form of "recfile". **/ var type = upload.single('recfile');  app.post('/upload', type, function (req,res) {    /** when using "single"       data come in "req.file" regardless of attribute "name". **/   var tmp_path = req.file.path;    /** original name of uploaded file       stored in variable "originalname". **/   var target_path = 'uploads/' + req.file.originalname;    /** better way copy uploaded file. **/   var src = fs.createreadstream(tmp_path);   var dest = fs.createwritestream(target_path);   src.pipe(dest);   src.on('end', function() { res.render('complete'); });   src.on('error', function(err) { res.render('error'); });  });