How to compare input and Document in mongoDB - node.js

Question

When I Register [ input Email / password to DB ] success. Then, I want to login. If input[email/pass] == document in collection >> go to next page, else console.log['wrong email/pass']
I try to wirte IF/else code but I don't know check condition.
This code is Register form
app.post('/register',function(req,res){
MongoClient.connect(url, function(err, db) {
if (err) throw err;
let dbo = db.db("project");
let myobj = { Email: req.body.email, Password: req.body.psw } ;
dbo.collection("Register").insertOne(myobj, function(err, res) {
if (err) throw err;
console.log(" document inserted");
db.close();
});
});
});
This code is Login form
app.post('/index',function(req,res){
MongoClient.connect(url, function(err, db) {
if (err) throw err;
let dbo = db.db("project");
let cursor = dbo.collection('Register').find();
cursor.each(function(err,doc) {
if (doc == req.body.email && req.body.psw){
console.log("goto next page");
}
else{
console.log('wrong');
}
});
db.close();
});
});
Correct input and wrong input Output is = Wrong
Pls insert loop check all of array pls.
app.post('/index',function(req,res){
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var dbo = db.db("project");
dbo.collection("Register").findOne({}, function(err, result) {
if (result.Email == req.body.email && result.Password == req.body.psw) {
console.log("OK");
}
else{
console.log(result.Email && result.Password);
}
db.close();
});
});
});

Answer 1

You have to compare individual values, like so:
if (doc.Email == req.body.email && doc.Password == req.body.psw){
console.log("goto next page");
}

Answer 2

Firstly you should check for valid request body and the you should do a fineone query instead of running a for-loop and checking. see the corrected one below :
app.post("/index", function(req, res) {
let {
email,
psw
} = req.body;
if (email && psw) {
console.log("wrong credentials");
return;
} else {
MongoClient.connect(url, function(err, db) {
if (err) throw err;
let dbo = db.db("project");
let data = dbo.collection("Register").findOne({
Email: email,
Password: psw
});
if (data) {
console.log("goto next page");
} else {
console.log("wrong");
}
db.close();
});
}
});

Answer 3

I'm late to the party but I just found a solution to a similar problem and wanted to share.
If you have input values in javascript and want to use them in a mongodb query you need to make them in to strings.
Assuming user._id is a value coming from a javascript function call.
This will work:
{ userId: { $eq: ${user._id} } } ✅
This won't work:
{ userId: { $eq: user._id } } ❌