Multer Resizer is an addon for the commonly used express library multer. It extends the file upload feature of multer and transforms image-resizing to a piece of cake.
Traditional image upload using multer:
app.post('/profile', upload.single('avatar'), function (req, res, next) {
// req.file is the `avatar` file
// req.body will hold the text fields, if there were any
})With Multer Resizer, you get the original file and also additional resized versions of it:
app.post('/profile', resizer.single('avatar'), function (req, res, next) {
// req.file is the `avatar` file
// req.file.coverPath, req.file.resizedPath etc...
})I am not going to publish my projects to npm anymore. You can install multer-resizer through this github repository using the command below:
$ npm install mertdogar/multer-resizer
Configuring multer resizer is easy, just declare tasks in an array. Any number of tasks are accepted.
const MulterResizer = require('multer-resizer');
const resizer = new MulterResizer({
multer: uploader,
tasks: [
{...},
{...}
]
});Multer resizer is not a multipart file handler, it just extends an existing multer instance. Therefore, you must provide a properly configured multer instance to make it work.
multer: uploaderResizes an image. The image is resized to the given dimension and the aspect ratio of the resized version may not be the same with the original image.
{
resize: {
width: 1920,
height: 1080,
interpolation: 'linear',
format: 'png'
}
}| Option | Description |
|---|---|
| interpolation | 'nearest-neighbor', 'moving-average', 'linear', 'grid', 'cubic', 'lanczos' default: 'linear' |
| format | 'png', 'jpg', 'gif' default: 'png' |
| suffix | default: 'resized' |
| width | Width in pixels |
| height | Height in pixels |
Cover a canvas with the image. The image will be resized to the smallest possible size such that both its dimensions are bigger than the canvas's dimensions. Margins of the image exceeding the canvas will be discarded.
{
cover: {
width: 800,
height: 600,
interpolation: 'linear',
format: 'png'
}
}| Option | Description |
|---|---|
| interpolation | 'nearest-neighbor', 'moving-average', 'linear', 'grid', 'cubic', 'lanczos' default: 'linear' |
| format | 'png', 'jpg', 'gif' default: 'png' |
| suffix | default: 'cover' |
| width | Width in pixels |
| height | Height in pixels |
const multer = require('multer');
const MulterResizer = require('multer-resizer');
const resizer = new MulterResizer({
multer: multer({storage: multer.diskStorage({destination: './'})}),
tasks: [
{
resize: {
width: 1920,
height: 1080,
suffix: 'resized-big'
}
},
{
resize: {
width: 100,
height: 100,
suffix: 'resized-small'
}
},
{
cover: {
width: 160,
height: 112,
suffix: 'thumbnail'
}
}
]
});
router.post('/', auth.ensureAuthentication, resizer.single('file'), function(req, res, next) {
// All multer-resizer tasks were completed
});Nodejs 4+
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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