Express.js File Upload
Express.js File Upload
- File upload is difficult because of its asynchronous nature and networking approach.
- It is done using middleware to handle multipart/form data. Middleware are used like multer,connect,body-parser etc.
- Example to demonstrate file upload in Node.js using middleware 'multer':
- Create a folder name file uploads and install multer middleware by running command on terminal
npm install --save multer
In index.html
<html>
<head>
<title>File upload Example by Codersdaily</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/jquery.form/3.51/jquery.form.min.js"></script>
<script>
$(document).ready(function() {
$('#uploadForm').submit(function() {
$("#status").empty().text("File is uploading...");
$(this).ajaxSubmit({
error: function(xhr) {
status('Error: ' + xhr.status);
},
success: function(response) {
console.log(response)
$("#status").empty().text(response);
}
});
return false;
});
});
</script>
</head>
<body>
<h1>Express.js File Upload: by CodersDaily</h1>
<form id="uploadForm" enctype="multipart/form-data" action="/uploadjavatpoint" method="post">
<input type="file" name="myfile" /><br/><br/>
<input type="submit" value="Upload Image" name="submit"><br/><br/>
<span id="status"></span>
</form>
</body>
</html>
In file app.js
var express = require("express");
var multer = require('multer');
var app = express();
var storage = multer.diskStorage({
destination: function (req, file, callback) {
callback(null, './uploads');
},
filename: function (req, file, callback) {
callback(null, file.originalname);
}
});
var upload = multer({ storage : storage}).single('myfile');
app.get('/',function(req,res){
res.sendFile(__dirname + "/index.html");
});
app.post('/uploadjavatpoint',function(req,res){
upload(req,res,function(err) {
if(err) {
return res.end("Error uploading file.");
}
res.end("File is uploaded successfully!");
});
});
app.listen(2000,function(){
console.log("Server is running on port 2000");
});
Run the server by command on terminal
node app.js
Server on port 2000
Uploading file
- After successful upload You can see file in uploads folder
