When handling a large database, we generally use operators like $match and $filter to filter selections. However, MongoDB provides a more powerful operator called $elemMatch that can query arrays and embedded documents. Using $elemMatch, we can match specific conditions within…
When developing web applications, we don’t actually build everything from scratch. We may sometimes want to “outsource” certain tasks. For this, we can use APIs from other websites that offer services that we integrate into our application without lifting a…
File System module in Node.js provides a variety of functionalities, one of which is copying files from one location to another. In this tutorial, we will see both asynchronous and synchronous ways of doing this. Copying a File in Node.js…
Node.js is a runtime environment built on the Chrome V8 engine that compiles JavaScript and converts it to native machine code. It is perfect for developing real-time web apps, chat applications, APIs, microservices, high-traffic websites, etc. I am personally a…
Suppose you got the job of managing all the schools in your city. You have created a collection of schools which contains all the school names, locations etc. Also, each school has its own MongoDB collection which includes course names,…
As a MERN fan, we all have a favourite database, MongoDB. While working with it we usually use the find() method to select or query multiple documents, on the other hand, we use findOne() to get one. We can also…
It is common to use arrays as field values in MongoDB documents to store different types of data. Let’s say we have a collection of colleges where each document represents a different college and each contains an array having different…
MongoDB is a NoSQL database that can store a large amount of unstructured data. Data stored in MongoDB are easy to retrieve as it can hold them in flexible formats depending upon the need such as graphs, key values, documents,…
MongoDB can store huge amounts of data and sometimes while inserting data in bulk some fields that we want to remove earlier remain there and are inserted in the database with empty or some values. Deleting these fields from all…
In MongoDB, we can export data to a variety of files which provides a convenience for the external programs to interact with it. Common file types in which data can be exported are TSV, CSV, BSON, and JSON. MongoDB allows…