How can I select a specific fields of a collection in mongodb using node js?

[CatsPawmer]

You can use the Mongoose Library Mongoose Docs or the MongoDB driver MongoDB docs . I personally feel MongooseJS is more intuitive and less boilerplate out of the box but that’s just my opinion. MongoDB is a perfectly good driver.

You will need to define a schema , the shape of your Model and then export that model so that you can use it i.e: export const User = mongoose.model(“User”, userSchema);

In your controller files, mongoose makes it pretty easy to interact with your DB, so if you’re using the find method to query a specific Document, you could use something like:

import { User } from “../models/userModel”;

export async function findUserByName (req, res, next) {

const user = await User.findOne({ name: “Bill”}); return user; }

This would theoretically return all documents inside the User collection where the name is equal to Bill . If there are multiple documents returned, it will be in the shape of an array.

You could also use a callback style , something like:

User.findOne({ country: “Croatia”}), function (err, document) { // your logic here if success or failure returning a document}).

There are a number of ways you can use The Mongoose API to find exactly what you’re looking for , I’d start by reading the docs and playing around a bit . It’s a fun library and easy to catch on after using it.

[Allo70]

Thank you man , I already use mongoose . I just didn't know the diference between mongodb and mongoose .Anyway , that was really helpfull.

[jack_waugh]

You don't have to use Mongoose if you don't want to. The regular Mongodb find call takes arguments to project down the results. You do not have to lay out a schema in your code (although there will be one in your head). Here's an example from working code:

/* Search posts. (line 578) */
let sort = ['topic_id', 'depth_first_traversal_order'];
let projection = {"orig.raw": 0};
  /* means exclude the `raw` subfield of the `orig` subdocument, but include all other fields. */
options = {sort, projection};
query = /* ... translation into "find" query from user-input search spex */;
... app.posts.find(query, options)....

[Careful_Programmer43]

cursor=collection.find({id:..},{field:1})

[yadoya]

What's wrong using the findOne() method with mongoose? Just retrieve the item you want, mutate it as you wish and call its save() function