ដើម្បីស្រង់​យក​ទិន្នន័យ​ដែលជា​ឯកសារណាមួយ​ យើង​អាចធ្វើដូច​ខាង​ក្រោមនេះ​បាន​៖

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 query = {"name":"Tin Sokhavuth"}

    req.mydb.collection("users").find(query).toArray(function(err, result){
        if (err) throw err
        req.data = {}
        req.data.message = JSON.stringify(result)
        next()
    })
}

export default func

មួយវិញទៀត ដើម្បី​ស្រង់​បណ្តាទិន្នន័យ​ទាំងឡាយ​ណា ដែលចាប់​ផ្តើម​ដោយ​អក្សរ​ណាមួយ យើង​ត្រូវ​ធ្វើដូច​ខាងក្រោម​នេះ៖

//models/mongodb.js

function func(req,res,next){
    let query = {"name":/^Tin S/}

    req.mydb.collection("users").find(query).toArray(function(err, result){
        if (err) throw err
        req.data = {}
        req.data.message = JSON.stringify(result)
        next()
    })
}

export default func