Resize image before upload using multer, sharp with node js and express js. In this node js tutorial, you will learn how to resize image before upload using multer, sharp with node js and express js.
Image upload is the basic requirement of any application. So this example will guide you step by step on how to resize image before upload using multer in node js. And you can understand a concept of node js compress image before upload.
Node Express Resize Image Before Upload Tutorial Example
Step 1 – Create Node JS App
In this step, open your terminal and execute the following command to create node js app:
mkdir my-app cd my-app npm init
Step 2 – Install Express and Multer Dependencies
In this step, open again your terminal and execute the following command to install express and multer dependencies in your node js app:
npm install express multer --save npm install sharp --save
Step 3 – Import Dependencies in Server.js File
In this step, you need to import dependencies in server.js file:
const express = require('express');
const multer = require('multer');
const path = require('path');
const sharp = require('sharp');
Step 4 – Create Server.js File
In this step, you need to create server.js file and add the following code into it:
const express = require('express');
const multer = require('multer');
const path = require('path');
const sharp = require('sharp');
const fs = require('fs');
const app = express();
const storage = multer.diskStorage({
destination: function(req, file, cb) {
cb(null, 'uploads/');
},
filename: function(req, file, cb) {
cb(null, file.fieldname + '-' + Date.now() + path.extname(file.originalname));
}
});
var upload = multer({ storage: storage })
app.get('/', (req, res) => {
res.sendFile(__dirname + '/index.html');
});
app.post('/', upload.single('image'),async (req, res) => {
const { filename: image } = req.file;
await sharp(req.file.path)
.resize(200, 200)
.jpeg({ quality: 90 })
.toFile(
path.resolve(req.file.destination,'resized',image)
)
fs.unlinkSync(req.file.path)
res.redirect('/');
});
app.listen(3000);
Step 5 – Create Form
In this step, create index.html file to resize image before upload in node js app. So, add the following html code into it:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Node js Resize Image Before Upload using Multer Example - Tutsmake
.com</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>Node js Resize Image Before Upload using Multer Example - tutsmake.com</h1>
<form action="/" enctype="multipart/form-data" method="post">
<input type="file" name="image" accept='image/*'>
<input type="submit" value="Upload">
</form>
</body>
</html>
Conclusion
In this tutorial, you have learned how to resize or compress image before upload in node js express framework.
