db

mongo-async.js

const { MongoClient, ServerApiVersion } = require("mongodb")
const client = new MongoClient(uri, {
    serverApi: {
      version: ServerApiVersion.v1,
      strict: true,
      deprecationErrors: true,
    }
});

async function main(){
    const connection = await client.connect("mongodb://localhost:27017/")
    const db = client.db('mongodb')
    const collection = db.collection('users')


    // register - kayıt

    await collection.insertOne({ name: "legendman46", pass: "şifre", ip: "127.0.0.0.1", register: Date.now(), lastlogin: null });

    // login - giriş

    const result = await collection.findOne({ name: req.body.username, pass: req.body.pass })
    if(!result || result === null) return res.send("geçersiz")
    else collection.updateOne({ _id: result._id }, { $set: { lastlogin: Date.now() }})
}

main();

mongo.js

const { MongoClient, ServerApiVersion } = require("mongodb")
const client = new MongoClient(uri, {
    serverApi: {
      version: ServerApiVersion.v1,
      strict: true,
      deprecationErrors: true,
    }
});
client.connect("mongodb://localhost:27017/")
    .then(connection => {
        const db = client.db('mongodb')
        const collection = db.collection('users')

        // register - kayıt

        collection.insertOne({ name: "legendman46", pass: "şifre", ip: "127.0.0.0.1", register: Date.now(), lastlogin: null })
            .then(result => {})
            .catch(err => console.error(err))


        // login - giriş
        collection.findOne({ name: req.body.username, pass: req.body.pass })
            .then(result => {
                if(!result || result === null) return res.send("geçersiz")
                else{
                    collection.updateOne({ _id: result._id }, { $set: { lastlogin: Date.now() }})
                        .then(result => {})
                        .catch(err => console.error(err))
                }
            })
            .catch(err => console.error(err))
    })
    .catch(err => console.error(err))

nedb.js

const NeDB = require("nedb")

const db = new NeDB({ 
    filename: "./nedb.json",
    autoload: true, 
    onload: err => 
        err ? console.error(err) : null,
})

// register - kayıt
db.insert({ name: "legendman46", pass: "şifre", ip: "127.0.0.0.1", register: Date.now(), lastlogin: null }, (err, doc) => {
    if(err) console.error(err)
})

// login - giriş
db.findOne({ name: req.body.username, pass: req.body.pass }, (err, doc) => {
    if(err) console.error(err);
    if(!doc || doc === null) return res.send("geçersiz");
    if(doc){
        db.update({ _id: doc._id }, { $set: { lastlogin: Date.now() }})
    }
})

Lordum