Uploading file using POST request in Node js

Question

I have problem uploading file using POST request in Node js  I have to use request module to accomplish that  no external npms   Server needs it to be multipart request with the file field containing file s data  What seems to be easy it s pretty hard to do in Node js without using any external module   I ve tried using this example but without success   request post     uri  url    method   POST     multipart         body    lt FILE DATA gt           function  err  resp  body      if  err        console log  Error         else       console log  URL      body

User · Answer

const remoteReq   request       method   POST       uri   http   host com api upload       headers           Authorization    Bearer     req query token         Content-Type   req headers  content-type       multipart form-data                req pipe remoteReq     remoteReq pipe res

User · Answer

Looks like you re already using request module   in this case all you need to post multipart form-data is to use its form feature   var req   request post url  function  err  resp  body      if  err        console log  Error         else       console log  URL      body           var form   req form    form append  file     lt FILE DATA gt        filename   myfile txt     contentType   text plain        but if you want to post some existing file from your file system  then you may simply pass it as a readable stream   form append  file   fs createReadStream filepath      request will extract all related metadata by itself   For more information on posting multipart form-data see node-form-data module  which is internally used by request

User · Answer

An undocumented feature of the formData field that request implements is the ability to pass options to the form-data module it uses   request     url   http   example com     method   POST     formData         regularField    someValue        regularFile   someFileStream       customBufferFile           value  fileBufferData        options            filename   myfile bin                       handleResponse     This is useful if you need to avoid calling requestObj form   but need to upload a buffer as a file  The form-data module also accepts contentType  the MIME type  and knownLength options   This change was added in October 2014  so 2 months after this question was asked   so it should be safe to use now  in 2017    This equates to version v2 46 0 or above of request

User · Answer

Leonid Beschastny s answer works but I also had to convert ArrayBuffer to Buffer that is used in the Node s request module  After uploading file to the server I had it in the same format that comes from the HTML5 FileAPI  I m using Meteor   Full code below - maybe it will be helpful for others   function toBuffer ab      var buffer   new Buffer ab byteLength     var view   new Uint8Array ab     for  var i   0  i  lt  buffer length    i        buffer i    view i         return buffer     var req   request post url  function  err  resp  body      if  err        console log  Error         else       console log  URL      body           var form   req form    form append  file   toBuffer file data       filename  file name    contentType  file type

User · Answer

You can also use the  custom options  support from the request library  This format allows you to create a multi-part form upload  but with a combined entry for both the file and extra form information  like filename or content-type  I have found that some libraries expect to receive file uploads using this format  specifically libraries like multer    This approach is officially documented in the forms section of the request docs - https   github com request request forms    toUpload is the name of the input file   lt input type  file  name  toUpload  gt   let fileToUpload   req file   let formData         toUpload          value  fs createReadStream path join   dirname              upload   fileToUpload filename          options            filename  fileToUpload originalname          contentType  fileToUpload mimeType                    let options         url  url      method   POST       formData  formData     request options  function  err  resp  body        if  err        cb err        if   err  amp  amp  resp statusCode    200          cb null  body

[node.js] Uploading file using POST request in Node.js

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