Nodejs uses Multe to upload files and store them on the server

install multer

yarn add multer  or  npm install multer

In need of use multer Import from the file

const multer = require("multer")

Interface for writing and uploading files

// adopt req.file  Receive the information of the transmitted file 
/* "file": { "fieldname": "file", "originalname": "5fbc140c-f2c6-490d-a9f8-e0a3c648fc46.jpg", // file name  "encoding": "7bit", // code  "mimetype": "image/jpeg", // file type  "destination": "E:\\project\\works\\works_server\\public", // Storage path  "filename": "909660f11ecbfe82494dc79aac9e60dc", "path": "E:\\project\\works\\works_server\\public\\909660f11ecbfe82494dc79aac9e60dc", // The absolute path to the file  "size": 1400503 // file size  } */
router.post("/api/upload",multer({
    
        dest:path.join(__dirname,"../public")
    }).single("file"),
    (req,res)=>{
    

        // Get the upload file   file name 、 Absolute path 
        const {
    originalname} = req.file
        const paths = req.file.path
        const extname = path.extname(originalname) // Get the extension of the file 
        let name = Date.now() + extname // New name 
        let newPath = path.join(__dirname,"../public/") + name // New path 
        fs.rename(paths,newPath,err=>{
       // adopt fs Modular rename Method   Modify the file name again 
            if (err) return res.send({
    message:' Upload error ',status:400})
            // Here, the file name can be stored in the database field for easy front-end access 
            res.send({
    
                message:' Upload successful ',
                name,
                newPath,
                file:req.file
            })
        })
})