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

# Overview

Deno offers great support for Docker. The Deno team offers multiple Deno images to choose from. These images are based on distributions like Centos, Debian, Ubuntu, and others.

By providing different distributions, you can select the image you like. This is handy when you have other tools to embed to the image and want to use a specific distribution.

# Deploying a Deno application

After installing and creating our first Since you’ve already installed and created your first image with Docker in the [previous](https://www.educative.io/pageeditor/6586453712175104/5989800099708928/5490516694663168#Building-a-Docker-image) lesson, you’re ready to do the same with a Deno application. Consider the code in the code widget below and try to create a Docker image.

Below you can find the code you need to use. You should be able to run this on your local machine and check that everything is working fine.

You can update **line 207**, which currently runs as follows:

```typescript
await app.listen({ port: 8000, secure: true, certFile: "/usercode/server.cert", 
keyFile: "private.key" });
```

To update it, replace it with the following line when working on a local machine:

```typescript
await app.listen({ port: 8080 });
```

Learn how to run a Deno application with Docker.

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

Deno and Docker

Overview

Deploying a Deno application