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

Deno run

deno_run_application

deno_run_db

deno_run_application_server_ts_file

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

# Standard libraries

A common file we need to import is from `https://deno.land/std@0.117.0/http/server.ts`, located at `std@0.117.0/http`. This is a reference to the HTTP module under Deno's standard library (std) version 0.117.0.

Like the HTTP module, there are a lot of standard Deno modules. Some of the most common are the following:

* `fs`: This module manipulates the file system.
* `log`: This module is a logger for Deno.
* `uuid`: This module is generated and handled by Deno, and it looks like `cf50b876-1bce-11ed-861d-0242ac120002`.
* `ws`: This module allows for work with WebSockets.

These modules are provided and maintained by the Deno team, which is why they’re standard, and they cover most of the basic use cases for creating simple applications.

We can find the complete list on the official Deno website. Feel free to take a look and see which libraries you might want to use. We’ll take a look at some of the example standard libraries provided to us by Deno in the following sections.

Learn about the Deno dependencies that we’ll use and others that are available to us.

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

Adding Dependencies to the Project

Standard libraries