File uploading with Express 4 0 req files undefined

Question

I m attempting to get a simple file upload mechanism working with Express 4 0 but I keep getting undefined for req files in the app post body  Here is the relevant code    var bodyParser   require  body-parser    var methodOverride   require  method-override          app use bodyParser   uploadDir  path join   dirname   files    keepExtensions  true       app use methodOverride            app post   fileupload   function  req  res      console log req files      res send  ok               and the accompanying Pug code    form name  uploader   action   fileupload   method  post   enctype  multipart form-data       input type  file   name  file   id  file       input type  submit   value  Upload     Solution Thanks to the response by mscdex below  I ve switched to using busboy instead of bodyParser   var fs   require  fs    var busboy   require  connect-busboy          app use busboy            app post   fileupload   function req  res        var fstream      req pipe req busboy       req busboy on  file   function  fieldname  file  filename            console log  Uploading      filename            fstream   fs createWriteStream   dirname     files     filename           file pipe fstream           fstream on  close   function                  res redirect  back

User · Answer

PROBLEM SOLVED          Turns out the storage function DID NOT run even once   because i had to include app use upload  as upload   multer  storage   single  file      let storage   multer diskStorage           destination  function  req  file  cb                cb null     storage                          filename  function  req  file  cb                console log file     this didn t print anything out so i assumed it was never excuted             cb null  file fieldname    -    Date now                             const upload   multer  storage   single  file

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Here is what i found googling around   var fileupload   require  express-fileupload    app use fileupload       Which is pretty simple mechanism for uploads   app post   upload   function req  res        var file       if  req files                res send  File was not found            return             file   req files FormFieldName      here is the field name of the form      res send  File Uploaded

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The body-parser module only handles JSON and urlencoded form submissions  not multipart  which would be the case if you re uploading files    For multipart  you d need to use something like connect-busboy or multer or connect-multiparty  multiparty formidable is what was originally used in the express bodyParser middleware   Also FWIW  I m working on an even higher level layer on top of busboy called reformed  It comes with an Express middleware and can also be used separately

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Please use below code   app use fileUpload

User · Answer

multer is a middleware which handles    multipart form-data    and magically  amp  makes the uploaded files and form data available to us in request as request files and request body   installing multer  - npm install multer --save  in  html file -   lt form method  post  enctype  multipart form-data  action   upload  gt       lt input type  hidden  name  msgtype  value  2   gt       lt input type  file  name  avatar    gt       lt input type  submit  value  Upload    gt   lt  form gt    in  js file -  var express   require  express    var multer   require  multer    var app   express    var server   require  http   createServer app   var port   process env PORT    3000  var upload   multer   dest   uploads        app use function  req  res  next      console log req files      JSON Object   next         server listen port  function        console log  Server successfully running at -   port        app get      function req  res      res sendFile   dirname     public file-upload html        app post   upload   upload single  avatar     function req  res      console log req files      JSON Object       Hope this helps

User · Answer

Just to add to answers above  you can streamline the use of express-fileupload to just a single route that needs it  instead of adding it to the every route  let fileupload   require  quot express-fileupload quot          app post  quot  upload quot   fileupload  function req  res

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1  Make sure that your file is really sent from the client side  For example you can check it in Chrome Console  screenshot  2  Here is the basic example of NodeJS backend   const express   require  express    const fileUpload   require  express-fileupload    const app   express     app use fileUpload        Don t forget this line   app post   upload   function req  res       console log req files      res send  UPLOADED

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It looks like body-parser did support uploading files in Express 3  but support was dropped for Express 4 when it no longer included Connect as a dependency  After looking through some of the modules in mscdex s answer  I found that express-busboy was a far better alternative and the closest thing to a drop-in replacement  The only differences I noticed were in the properties of the uploaded file   console log req files  using body-parser  Express 3  output an object that looked like this     file        fieldName   file        originalFilename   360px-Cute Monkey cropped jpg        name   360px-Cute Monkey cropped jpg       path   uploads 6323-16v7rc jpg        type   image jpeg        headers            content-disposition    form-data  name  file   filename  360px-Cute Monkey cropped jpg             content-type    image jpeg          ws         WriteStream                     size  48614       compared to console log req files  using express-busboy  Express 4      file        field   file        filename   360px-Cute Monkey cropped jpg        file   uploads 9749a8b6-f9cc-40a9-86f1-337a46e16e44 file 360px-Cute Monkey cropped jpg        mimetype   image jpeg        encoding   7bit        truncated  false      uuid   9749a8b6-f9cc-40a9-86f1-337a46e16e44

User · Answer

express-fileupload looks like the only middleware that still works these days   With the same example  multer and connect-multiparty gives an undefined value of req file or req files  but express-fileupload works   And there are a lot of questions and issues raised about the empty value of req file req files

[node.js] File uploading with Express 4.0: req.files undefined

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