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To find duplicate entries in MongoDB based on the code and user_id fields, you can use the aggregate method along with the $group and $match pipeline stages. Here is an example of how to do this: Let's take the example collection - user_collection .     {             "_id" : ObjectId( "640054ef881f521a7b68fc96" ) ,             "code" : "google_uploader" ,             "user_id" : "33052" ,             "type" : "uploader" ,             "charge_type" : "Prepaid" ,             "available_credits" : 500 ,             "total_used_credits" : 0     }     {             "_id" : ObjectId( "640054ef881f521a7b68fc99" ) ,             "code" : "google_uploader" ,         ...

Is there a way to copy one collection to another in MongoDB while adding a new field? Yes, it is possible to copy one collection to another in MongoDB by adding a field using the $addFields pipeline stage in the aggregation framework. Here is an example of how you can do it: Suppose we have two collections named source_collection and target_collection , and we want to copy data from source_collection to target_collection by adding a new field called new_field . Sample source_collection documents:     {         "_id" : 1 ,         "name" : "John" ,         "age" : 25     },     {         "_id" : 2 ,         "name" : "Jane" ,         "age" : 30     },     {         "_id" : 3 ,         "name" : "Bob" ,         "age" : 40     } We want to copy this co...

CRUD with Node.js and MongoDB To perform CRUD (Create, Read, Update, and Delete) operations using Node.js and MongoDB, we can follow these steps: 1. Install Node.js To install Node.js, visit https://nodejs.org/en/ . The node version used in this code is v16.15.0. 2. Install the MongoDB driver First, create a project directory. We will name our project "CrudApp" . Then, to install the MongoDB driver, use npm by running the following command: npm install mongodb For the database view, you can download MongoDB Compass, or MongoDB Atlas can also be used. 3. It's time to CODE          // Node.js has a built-in module called HTTP. This helps     // Node.js to send information using the     // Hyper Text Transfer Protocol (HTTP).     const http = require ( 'http' );     // url module provides utilities for URL resolution and parsing.     // We are using variable as nodeUrl because we have already   ...