在javascript中读取、删除、复制或重写csv上传文件mongoose mongodb

您好，我正在尝试读取数据库中上载的文件，读取后，我想删除文件中的重复项并重写为新文件，然后我想在我的网页上显示它。请问我该怎么做

这是我的密码

这是文件上传post和get路径

const multer = require('multer');
const uuid = require('uuid').v4;
const router = express.Router();
const File = require('../models/file');
const path = require('path');
const fs = require('fs');

const storage = multer.diskStorage({
    destination: (req, file, cb) => {
        cb(null, 'uploads');
    },
    filename: (req, file, cb) => {
        const ext = path.extname(file.originalname);
        const id = uuid();
        const filePath = `files/${id}${ext}`;
        File.create({filePath})
            .then(() => {
                 cb(null, filePath);
            })
    }
})

const upload = multer ({
    storage: storage,
    limits: {fieSize: 10000000000},
    fileFilter: function (req, file, cb){
        checkFileType(file, cb);
    }
}).array('file-upload');



function checkFileType(file, cb) {
    const filetypes = /csv/;
    const extname = filetypes.test(path.extname(file.originalname).toLocaleLowerCase());
    const mimetype = filetypes.test(file.mimetype);

    if (mimetype && extname){
        return cb(null, true);
    }else{
        cb('Error: CSV Files only');
    }
};

router.get('/uploads', (req, res) => {
    File.find({})
        .then((files) => {
            res.render('myProfile/myProfile', {files: files});
        })
});

router.post('/uploads',(req, response) => {
    upload(req, response, (error) => {
        if(error){
            response.render('myProfile/myProfile', {
                msg: error
            });
        }else{
            console.log(req.files);
            if(req.files === undefined){
                response.render('myProfile/myProfile', {
                    msg: 'Error: No File Selected'
                });
            }else{
                response.render('myProfile/myProfile', {
                    msg: 'File Uploaded Successfully',
                    //file= `uploads/${req.file.filename}`
                });
            }
        }
    })
});






/**
 * function checkFileType(file, callback){
    const filetypes = /csv|json/;
    const extname = filetypes.test(path.extname(file.originalname).toLowerCase());
    const mimetype = filetypes.test(file.mimetype);

    if(mimetype && extname){
        return callback(null, true);
    }else{
        callback('Error: CSV or JSON files Only!');
    }
}
 */

/**
 * //downloading the file after harmoniszing
const input = document.getElementById('file');
const button = document.getElementById('share');
let objectURL;

input.addEventListener('change', function(){
    if(objectURL){
        URL.revokeObjectURL(objectURL);
    }

    const file = this.files[0];
    objectURL = URL.createObjectURL(file);

    button.download = file.name;
    button.href = objectURL;
});

 */

module.exports = router;

这就是我的模式

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const FileSchema = new Schema(
    {
        filePath:String
    },
    {
        timestamps:String
    }, 
    {
        filename:String, 
    }
);



module.exports =  mongoose.model('File', FileSchema);

最后是ejs模板

                    <div id="uploadfile" class="input-group">
                        <%= typeof msg != 'undefined' ? msg : '' %> 
                        <form action="/uploads" class="input-group mt-1 mb-2" id="upload" method="POST" enctype="multipart/form-data">
                            <input type="file" class="form-control" id="inputGroupFile03" name="file-upload" aria-describedby="inputGroupFileAddon03" aria-label="Upload" id="file" accept=".csv" multiple>
                            <button class="btn btn-outline-success" type="submit" id="inputGroupFileAddon03"><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" class="bi bi-upload" viewBox="0 0 16 16">
                                <path d="M.5 9.9a.5.5 0 0 1 .5.5v2.5a1 1 0 0 0 1 1h12a1 1 0 0 0 1-1v-2.5a.5.5 0 0 1 1 0v2.5a2 2 0 0 1-2 2H2a2 2 0 0 1-2-2v-2.5a.5.5 0 0 1 .5-.5z"/>
                                <path d="M7.646 1.146a.5.5 0 0 1 .708 0l3 3a.5.5 0 0 1-.708.708L8.5 2.707V11.5a.5.5 0 0 1-1 0V2.707L5.354 4.854a.5.5 0 1 1-.708-.708l3-3z"/>
                            </svg></button>
                        </form> 
                    </div>
                    <div id="uploadfile">
                        <table class="table border border-success" id="uploadfile">
                            <thead>
                                <tr>
                                    <th class="table-head border border-success">NAME</th>
                                    <th class="table-head border border-success">DELETE</th>
                                    <th class="table-head border border-success">SHARE</th>
                                </tr>
                            </thead>
                            <tbody>
                            </tbody>
                        </table>
                    </div>
                </div>

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我已成功上载文件路径并将其路径保存到我的数据库。然而，我坚持在阅读上传的文件部分

有人能帮忙吗

多谢各位