It’s been quite a while I didn’t post anything in this blog, I was kept busy everyday even though I don’t know why.

Few days ago I’m required to implement a simple file upload interface, in order test the API I developed a mock node.js server which will take the uploaded file. The mock is built with express.js.

Don’t forget to install two package:

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npm install --save formidable
npm install --save fs-extra

Now the project source tree is like this:

Here’s the code, ##index.js##

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var express = require('express');
var router = express.Router();
var formidable = require('formidable');
var fs =require('fs-extra');    //File System-needed for renaming file etc

/* GET home page. */
router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });
});

router.post('/upload', function(req, res, next0) {
  var form = new formidable.IncomingForm();
  //Formidable uploads to operating systems tmp dir by default
  form.uploadDir = "img";       //set upload directory
  form.keepExtensions = true;     //keep file extension

  form.parse(req, function(err, fields, files) {
    res.writeHead(200, {'content-type': 'text/plain'});
    res.write('received upload:\n\n');
    console.log("form.bytesReceived");
    //TESTING
    console.log("file size: "+JSON.stringify(files.fileUploaded.size));
    console.log("file path: "+JSON.stringify(files.fileUploaded.path));
    console.log("file name: "+JSON.stringify(files.fileUploaded.name));
    console.log("file type: "+JSON.stringify(files.fileUploaded.type));
    console.log("astModifiedDate: "+JSON.stringify(files.fileUploaded.lastModifiedDate));

    //Formidable changes the name of the uploaded file
    //Rename the file to its original name
    fs.rename(files.fileUploaded.path, './img/'+files.fileUploaded.name, function(err) {
      if (err)
        throw err;
      console.log('renamed complete');
    });
    res.end();
  });
});

module.exports = router;

And we need a page ##index.jade## to test the server:

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form(method="post", action="upload", enctype="multipart/form-data")
  input(type="file", name="fileUploaded")
  input(type="submit")