How to upload file in node js using multer
Posted By : Ankit Singh Rana | 03-Sep-2017
Multer is a middleware in node js, which is used for uploading files. To get started we would need to install it via
npm install --save multer
Now first we require it and define its destination and some filter. Below is an example.
var multer = require('multer'); // Require it
var upload = multer({ dest: 'public/img' },{ // Set the destination
fileFilter: function (req, file, cb) { // a custom filter
if (mimeType.indexOf(file.mimetype) != -1) {
return cb(null, false);
}
cb(null, true);
}
});
In fileFilter function, we can define which type of file, the API would accept etc. In dest, we would define where the file will be saved on the server.
Now, all we need is to use this middleware where we want to upload the file.
router.post('/',upload.array('images'), function(req, res) {});
Upload.array will take images array. The name of the array is images, you can name it anything you want.
To upload a single file we will use ".single" function shown below.
router.post('/',upload.single('image'), function(req, res) {});
This will upload a single file name image. Also, req.body will also hold the text field as well.
You can also pass an array of objects if you want, where filename would be the key and value would be the array of files.
Below is an example
var cpUpload = upload.fields([{ name: 'avatar', maxCount: 1 }, { name: 'gallery', maxCount: 8 }])
router.post('/',upload.array('cpUpload'), function(req, res) {});
As you can see, you can also define a number of files you want to upload.
Cookies are important to the proper functioning of a site. To improve your experience, we use cookies to remember log-in details and provide secure log-in, collect statistics to optimize site functionality, and deliver content tailored to your interests. Click Agree and Proceed to accept cookies and go directly to the site or click on View Cookie Settings to see detailed descriptions of the types of cookies and choose whether to accept certain cookies while on the site.
About Author
Ankit Singh Rana
Ankit is a UI Developer having experience in Angular 2, Angular JS, JavaScript, HTML5 and CSS3. His hobbies includes playing video Games and traveling.