ដើម្បីលុប​ទិន្នន័យ​ដែលជាឯកសារ​ណា​មួយ​នៅ​ក្នុង​មូលដ្ឋាន​ទិន្នន័យ MongoDB យើង​ចាំបាច់ត្រូវ​ប្រើប្រាស់​វិធី​ឈ្មោះ deleteOne() ដោយ​ធ្វើ​ដូច​ខាង​ក្រោម​នេះ៖

import express from 'express'
import path from 'path'
 
const app = express()
const port = process.env.PORT || 3000
const __dirname = path.resolve()
 
import index from './routes/index.js'
import backend from './routes/backend.js'
import mydb from './models/connectMongoDB.js'
 
app.use('/',async function(req,res,next){
    req.mydb = await mydb
    req.__dirname = __dirname
    next()
})
 
app.set('views', path.join(__dirname, 'views'))
app.set('view engine', 'ejs')
app.use(express.static(path.join(__dirname, 'public')))
app.use(express.urlencoded({extended:false}))
app.use(express.json())
                                  
app.use('/',index) 
app.use('/backend',backend) 
 
app.listen(port,function(){
    console.log(`This application is listening to the port: ${port}`)
})

/* ./routes/index.js */
import express from 'express'
import func from '../models/mongodb.js'
const index = express.Router()
 
index.use(func)
 
index.get('/',(req,res)=>{
    res.render('base',req.data)
})
 
export default index

//models/mongodb.js
 
function func(req,res,next){
    let myquery = {name:/^Keo/}
 
    req.mydb.collection("users").deleteOne(myquery, function(err,result){
        if (err) throw err
        req.data = {}
        req.data.message = `${result.deletedCount} document were deleted!`
        next()
    })
}
 
export default func

លើសពី​នេះទៀត បើ​សិន​ជា​យើង​ចង់​លុប​ទិន្នន័យ​លើ​សពី​មួយ យើង​ចាំបាច់​ត្រូវប្រើប្រាស់​វិធី​ឈ្មោះ deleteMany() ដោយ​ធ្វើ​ដូច​ខាង​ក្រោម​នេះ៖

//models/mongodb.js
 
function func(req,res,next){
    let myquery = {gender:/^f/}
 
    req.mydb.collection("users").deleteMany(myquery, function(err,result){
        if (err) throw err
        req.data = {}
        req.data.message = `${result.deletedCount} document were deleted!`
        next()
    })
}
 
export default func