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how to get a particular user data from MongoDB in node.js

I'm doing a project on an e-commerce website. here I'm with a problem.
I have used the get method to retrieve user data from MongoDB
I have passed the correct parameters and the statement UserId:req.params.userId has been satisfied where we can see in the nodejs terminal.
I'm looking to get only particular user data with UserId === UserId. But in my result, all the user's data is popping up.
Im trying this but the solution im getting is all the users data
i have tried using findOne() but the result is this 635ea7e5e931e12c9f851dd3 user details. where the parameter is 63a8a0f77addf42592eed1e5. where im expecting to get the only user which im passing in parameter.
router.get("/find/:userId", verifyTokenAndAuthorization, async (req, res) => {
try {
const cart = await Cart.find(
{userId : req.params.userId});
console.log("parameter: "+req.params.userId)
return res.status(200).json(cart);
} catch (err) {
res.status(500).json(err);
}
The req.params userId is '63a8a0f77addf42592eed1e5'. i need only this. but it is popping up all the users data.
Node.js terminal showing the parameter is same with userId
Postman showing the response of all users present in the DB but i need only the user details which i had passed in the parameter

Here the mongoDB find method returns all data in the collection, irrespective of the parameters that we pass in to it. Instead try using the findOne method for that collection. So the code with correction will be as follows:
router.get("/find/:userId", verifyTokenAndAuthorization, async (req, res) => {
try {
const cart = await Cart.findOne(
{userId : req.params.userId});
console.log("parameter: "+req.params.userId)
return res.status(200).json(cart);
} catch (err) {
res.status(500).json(err);
}
You can read more about the method at MongoDB Manual.

I had found the solution for my problem i.e I have used filter method at (res(200).json(cart.filter(((user)=>user.UserId === req.params.userId))
This means
Using filter method UserId in my model === to the parameters userId
router.get("/find/:userId", verifyTokenAndAuthorization, async (req, res) => {
try {
const cart = await Cart.find(
{userId : req.params.userId});
console.log("parameter: "+req.params.userId)
res.status(200).json(cart.filter((user)=>user.UserId === req.params.userId));
console.log(cart.filter((user)=>user.UserId === req.params.userId))
} catch (err) {
res.status(500).json(err);
}
});

Editing a mongoDB item not updating but not receiving an error

I am desperate for some help with an issue I am having updating an item in a mongoDB database. I am creating a simple note application using nodeJS and I have set it up to add notes and remove notes to and from the database with no issues.
When I try to edit notes however, the update does not persist to the database. I dont get an error back and when I console.log the result it displays the correct data but just wont seem to push it to the data base. I have been using mongoose and findByIdAndUpdate. Here is the JavaScript code for my update route
app.put("/:id", (req, res) => {
Note.findByIdAndUpdate(req.params.id, req.body.note, (err, updatedNote) => {
if(err) {
console.log(err);
} else {
res.redirect(`/${req.params.id}`);
console.log(req.params.id);
console.log(req.body.note);
console.log("note updated");
}
});
});
As I mentioned, I dont get any error and the console.logs return the correct id and updated content. All my routes take me to the place so I don't believe there is an issue with them. Any help would be greatly appreciated. I can also provide more code if needed
Thanks in advance
Will

When updating in MongoDB, you have to reference the field you are trying to update. Your code should look like this
app.put("/:id", (req, res) => {
Note.findByIdAndUpdate(req.params.id, {text: req.body.note}, (err, updatedNote) => {
if(err) {
console.log(err);
} else {
res.redirect(`/${req.params.id}`);
console.log(req.params.id);
console.log(req.body.note);
console.log("note updated");
}
});
});
PS: I am hoping the field in the DB model is called text
To make the code look sexier, you can switch it to Async/Await
app.put("/:id", async (req, res) => {
let updatedNote = await Note.findByIdAndUpdate(req.params.id, {text:
req.body.note}, {new: true}).catch(err => console.log(err))
res.redirect(`/${req.params.id}`);
console.log(req.params.id);
console.log(req.body.note);
console.log("note updated");
});

That updatedNote is the same as before the update is expected behavior – see the mongooe docs:
By default, findOneAndUpdate() returns the document as it was before
update was applied. If you set new: true, findOneAndUpdate() will
instead give you the object after update was applied.
This does not mean the update did not take place.

Post Multiple Objects Inside Express Route

I would like to post multiple objects to my mongo database inside of an express route. Currently, everything is working fine when I do it as a single object (ie ONE casino), please see below, but instead of doing this a million times over, can someone help me do it as one giant data dump so I can post ALL my casinos?
Here is my route that works fine for posting a single object:
router.post('/post', async (req, res) => {
console.log(req.body);
const casinoD = new Casino({
casino: req.body.casino,
table_and_other: req.body.table_and_other,
poker: req.body.poker,
slot_machines: req.body.slot_machines,
total_gaming_win: req.body.total_gaming_win,
year: req.body.year,
month: req.body.month,
combined_date: req.body.combined_date
})
try {
const newCasino = await casinoD.save()
res.status(201).json(newCasino)
} catch (err) {
res.status(400).json({ message: err.message})
}
})
I also understand mongoimport is a better way to do this - however that had its own issues in of itself.
Thanks

Like #JDunken said, you can iterate over the POST body as an array and insert in bulk. You'll want to use
insertMany for speed. To insert millions of records, you will probably want to put a sane limit on the number of records per request, and send API requests in batches. Validation is optional, as Mongoose will run validation according to the schema. It depends on how you want to handle validation errors. Make sure to read up on the ordered and rawResult options for that as well.
router.post('/post', async (req, res) => {
// you should sanity check that req.body is an array first, depending on how robust you want error handling to be
const casinos = req.body.filter(input => isValid(input));
try {
const insertedCasinos = await CasinoModel.insertMany(casinos, { ordered: false });
res.status(201).json(insertedCasinos)
} catch (err) {
res.status(400).json({ message: err.message})
}
})
const isValid(input) {
let valid = true;
// implement input validation
return valid;
}

FS write file is breaking my json, how to correctly update just one key?

I have a simple json object like so.
{
"gymData": {
"previousWorkouts": [
],
"exercises": [
]
}
}
both of the arrays above, are full of objects. I have 2 end points /workouts and /exercises.
my backend is just a simple express server with custom end points. when I add a new workout in the frontend and click submit, the /workouts endpoint behaves correctly.
however, I'm getting some issue when it's not updating the json correctly and resulting in a json error.
this is my node endpoint code
app.post("/exercises", function(req, res) {
fs.readFile('db.json', 'utf8', function (err, data) {
if (err) throw err;
let databaseData = JSON.parse(data);
const workoutExercises = req.body.workoutExercises.workouts
workoutExercises.forEach(exercise => {
const filteredExerciseDatabase = databaseData.gymData.exercises.filter(ex => ex.name === exercise.name)
filteredExerciseDatabase[0].previousWeights.push({date: req.body.date, weight: exercise.weight})
})
const updatedData = JSON.stringify(databaseData)
console.log(updatedData)
fs.writeFile('db.json', updatedData, 'utf8', function(err, data) {
if (err) throw err;
res.status(200).send("Basket was updated");
});
});
})
instead of writing the whole file again. I was wondering if I can just update the specific object key that I need too?
also, for reference, the error seems to be appending extra stuff onto the json object, so it's breaking. but in this line: console.log(updatedData) when I copy that logged data into a json validator, it is valid. so I'm confused as to why it's not writing the correct thing :/

Deleting / removing with Mongoose with multiple parameters

This is my first attempt at deleting data in a MongoDB database. I'm loosely following this tutorial (just the delete part) to no avail, https://www.airpair.com/javascript/complete-expressjs-nodejs-mongodb-crud-skeleton. I just want to delete all the requested people who are in the requested country. All of my other requests work so I will just post the code that I know is not working, everything else is fine.
EDIT
The error I get in the log is "404 Not Found". When testing w/ Postman the response I get is, "Cannot DELETE /deletepeople/USA/John"
app.delete('deletepeople/:country/:name', function(req, res) {
var countryReq = req.params.country;
var nameReq = req.params.name;
peopleModel
.find({"country":countryReq}, function(err, country) {
country.find({"name": nameReq}, function (err, person) {
person.remove(function (err, person) {
if (err) {
console.log(err);
res.status(500).send();
}
return res.status(200).send();
})
})
})
});
});

country.find({"name": nameReq}, function (err, person) {
The above line is causing you an error, what are you searching in a returned document? Its just an document and not a collection.
You can use the id() method in embedded docs:
Look at the subdocuments [http://mongoosejs.com/docs/subdocs.html]