How to Single Multiple File Upload Express using Node.js Multer

In this chapter we will learn node js file upload, node js multer file upload with example, node js multiple file upload, node js express upload image example, node js rest api file upload, multer multiple file upload. We will use express-generator tool for creating a application. And we will use view engine hbs.

First of all, we will install express-generator tools globaly. If you have already installed express-generator tool then no need to install.

Intallation express-generator tool


npm install express-generator -g

Create a Application

Create a application using express-generator tool and set view engine hbs

express --view=hbs myapp

Then install dependencies


cd myapp
npm install

Install multer

Multer is a node.js middleware for handling multipart/form-data, which is used for uploading files.

npm install --save multer

Create a blogs.js in routes folder for upload files.

Edit app.js

Edit app.js file and import var blogsRouter = require('./routes/blogs'); and set blogs route app.use('/blogs', blogsRouter);


.....
var blogsRouter = require('./routes/blogs');
.....
.....
app.use('/blogs', blogsRouter);

DiskStorage

The disk storage engine gives you full control on storing files to disk.



var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'uploads/')
  },
  filename: function (req, file, cb) {
    cb(null, Date.now() + file.originalname)
  }
})

var upload = multer({ storage: storage })

Single File Upload

Import multer into routes/blogs.js for file upload.

routes/blogs.js


var express = require('express');
var router = express.Router();
var multer = require('multer');

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'uploads/')
  },
  filename: function (req, file, cb) {
    cb(null, Date.now() + file.originalname)
  }
})

var upload = multer({ storage: storage })

/* GET create blog. */
router.get('/create', function(req, res, next) {
  res.render('create', {title: 'Create Blog'});
});

/*single file upload*/
router.post('/upload', upload.single('blogimage'), function(req, res, next) {
  var fileinfo = req.file;
  var title = req.body.title;
  console.log(title);
  res.send(fileinfo);
})

module.exports = router;

View File

Create a view file create.hbs in viewsfolder.

views/create.hbs


<div class="container">
  <h1>{{title}}</h1>
  <hr />
  <div class="row">
      <div class="col-md-6">
        <form action="/blogs/upload" method="post" enctype="multipart/form-data">
          <div class="form-group">
            <input type="text" name="title" class="form-control" placeholder="Title">
          </div>
          <div class="form-group">
            <input type="file" name="blogimage"/>
          </div>
          <button type="submit" class="btn btn-info">upload</button>
        </form>
      </div>
  </div>
</div>

Multiple Files Upload


/*multiple files upload*/
router.post('/uploads', upload.array('blogimage', 5), function(req, res, next) {
  var fileinfo = req.files;
  var title = req.body.title;
  console.log(title);
  res.send(fileinfo);
})

In multiple files upload, accept an array of files, all with the name fieldname and number of files. In this code upload.array(‘blogimage’, 5) blogimage is fieldname< and 5 is number of files

Add multiple in html form

<input type="file" name="blogimage" multiple/>

Complete Code

rotues/blogs.js

var express = require('express');
var router = express.Router();
var multer = require('multer');

var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, 'uploads/')
  },
  filename: function (req, file, cb) {
    cb(null, Date.now() + file.originalname)
  }
})

var upload = multer({ storage: storage })

/* GET create blog. */
router.get('/create', function(req, res, next) {
  res.render('create', {title: 'Create Blog'});
});

/*single file upload*/
router.post('/upload', upload.single('blogimage'), function(req, res, next) {
  var fileinfo = req.file;
  var title = req.body.title;
  console.log(title);
  res.send(fileinfo);
})

/*multiple files upload*/
router.post('/uploads', upload.array('blogimage', 5), function(req, res, next) {
  var fileinfo = req.files;
  var title = req.body.title;
  console.log(title);
  res.send(fileinfo);
})

module.exports = router;

Run the app with this command


npm start

Then load http://localhost:3000/ in your browser to access the app.

File upload url http://localhost:3000/blogs/create

In this lesson we have learned installation of express-generator tool and create application using express-generator tool. Upload single and multiple file using multer in Node.js.

#node-js #javascript