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MongoDB has quickly become the foremost NoSQL database on the market, having been adopted by companies of all sizes for the various benefits it offers toward building modern applications. In this interactive course, you'll get to see for yourself why there's so much hype around MongoDB, and learn all about how to use it.

You'll start off with an introduction to Relational and NoSQL databases, get into some basic command operations, and build up from there toward more advanced concepts. You'll then get into using MongoDB in C# and .NET Core as well as its uses in MEAN Stack. Throughout the way, you'll have the chance to use MongoDB to build interesting projects as you learn.

The Definitive Guide to MongoDB

In the [previous](https://www.educative.io/courses/definitive-guide-to-mongodb/creating-users) lesson, we looked at the typescript and HTML files. Now, let’s take a look at the implementation of `UserService` and the back-end implementation for the insertion of a user.

## `UserService`

This class is in charge of communication with the *back-end* through the *Web API* and, because of that, it has to use *Angular’s HTTP* service. 
#### Example
Here is the code in the */mean_frontend/src/app/services/users.service.ts* file:

In the [previous](https://www.educative.io/courses/definitive-guide-to-mongodb/creating-users) lesson, we looked at the typescript and HTML files. Now, let’s take a look at the implementation of `UserService` and the back-end implementation for the insertion of a user.

# `UserService`

This class is in charge of communication with the *back-end* through the *Web API* and, because of that, it has to use *Angular’s HTTP* service. 
## Example
Here is the code in the */mean_frontend/src/app/services/users.service.ts* file:

This lesson explains how to insert a user into the database. It focuses on the UserService class and the backend implementation of the insertion operation.

Inserting Users

Introduction to NoSQL and Polyglot Persistence

Getting Started Using MongoDB

High Availability and High-Throughput Configurations

Using MongoDB in C# and .Net Core

Using MongoDB with Node.js, Express and Angular

Serverless & MongoDB Atlas

Appendix

Inserting Users

`UserService`

Example