use multer to upload file nodejs code example
Example 1: multer multiple file upload
app.post('/projects', upload.array('uploadedImages', 10), function(req, res, err) {
if (err) {
console.log('error');
console.log(err);
}
var file = req.files;
res.end();
console.log(req.files);
});
Example 2: express multer example
const multer = require('multer')
const { resolve } = require('path')
const { existsSync, unlink } = require('fs')
const diskStorage = multer.diskStorage({
destination: (req, file, done) => {
if (!file) return done(new Error('Upload file error'), null)
const fileExits = existsSync(resolve(process.cwd(), `src/images/${file.originalname}`))
if (!fileExits) return done(null, resolve(process.cwd(), 'src/images'))
unlink(resolve(process.cwd(), `src/images/${file.originalname}`), (error) => {
if (error) return done(error)
return done(null, resolve(process.cwd(), 'src/images'))
})
},
filename: (req, file, done) => {
if (file) {
const extFile = file.originalname.replace('.', '')
const extPattern = /(jpg|jpeg|png|gif|svg)/gi.test(extFile)
if (!extPattern) return done(new TypeError('File format is not valid'), null)
req.photo = file.originalname
return done(null, file.originalname)
}
}
})
const fileUpload = multer({ storage: diskStorage, limits: 1000000 })
module.exports = { fileUpload }
Example 3: express multer example
const multer = require('multer')
const { extname, resolve } = require('path')
const diskStorage = multer.diskStorage({
destination: (req, file, done) => {
if (!file) return done(new Error('Upload file error'), null)
return done(null, resolve(process.cwd(), 'src/images'))
},
filename: (req, file, done) => {
if (file) {
const imagePattern = /(jpg|jpeg|png|gif|svg)/gi
const mathExt = extname(file.originalname).replace('.', '')
if (!imagePattern.test(mathExt)) {
return new TypeError('File format is not valid')
}
req.file = file.originalname
return done(null, file.originalname)
}
}
})
const fileUpload = multer({ storage: diskStorage, limits: 1000000 })
module.exports = { fileUpload }