Delve into building a GraphQL endpoint with Deno, compare technologies, configure queries, and integrate PostgresSQL and MongoDB databases to create a secure, high-performing application.

deno.tar.gz

Deno version

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docker-deno

Deno is a modern and secure runtime for JavaScript. It was created by the same team that created Node.js. Deno offers better performance, security, and simplicity than any other JavaScript runtime.

In this course, you will start by understanding the different technologies used in Deno, such as Typescript. You will compare these technologies with JavaScript and GraphQL as well as learn their terminologies. Then, you will create your own endpoint with Deno and configure queries and mutations in it. Next, you will explore two different databases with Deno: first, you’ll learn how to set up an SQL database using PostgresSQL and then how to configure a NoSQL database using MongoDB to store documents and collections of on-demand data. Finally, you’ll put everything together to have a fully functioning GraphQL endpoint made with Deno and backed by PostgreSQL and MongoDB. 

After this course, you’ll be able to create a Deno application and a GraphQL endpoint while having a database of your choice to store data.

Building a GraphQL Endpoint with Deno

# Direct Approach

The most straightforward approach is to go directly to MongoDB’s official website, and, depending on your OS, you can download and install the MongoDB service to be run locally. MongoDB offers two versions: one is free and under the community license, the other is the enterprise version.

# Using Docker

This approach uses the official MongoDB image to start the service, similar to the approach with Postgres. To do so, run this Docker command:

```shell
docker run --name deno-mongo -d mongo
```

This command will start your MongoDB service via Docker. Don’t forget to check that the service is running with `docker ps`. If everything is working as expected, you can skip to the last sectionto learn how to connect to the database.

# Using MongoDB Atlas

For this section, you’ll use a cloud service called **MongoDB Atlas** (previously known as **Mlab**), which will allow you to host a MongoDB database in the cloud. This service is part of the MongoDB company. You’ll need to create an account and log in to their website. Once you’ve done that, you should land on this home page: 

Introduction to Deno, TypeScript, and GraphQL

Creating a Basic GraphQL Endpoint

Databases and Deno

SQL: Postgres and Deno

NoSQL: Mongo and Deno

Wrapping Up

Appendix

Installing a MongoDB Service

Direct Approach

Using Docker