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

## Direct approach

The most straightforward approach is to go to Postgres’s official website. On the “Download” page, specify your operating system and find the steps to download and install Postgres.

## Using Docker

Take a look at another approach using Docker. You won’t need to install or add extra packages to your computer for this approach. Instead, you’ll use Docker to start a Postgres service directly. This approach uses the official Postgres image that can be found on Docker Hub. To start the service, simply launch it using the Docker `run` command:

```shell
docker run --name deno-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres
```

This command is pretty basic. You only need to pass the name and the environment variable `POSTGRES_PASSWORD`, which is mandatory. You can check the official documentation to see if you need to add other variables. Make sure to check that the service is running with `docker ps` command. If everything works as expected, you can skip to the last section, where you connect to the database.

## Using ElephatSQL 

Take a look at how you can install a Postgres service using ElephatSQL. For this approach, you won’t be using any local installation. Instead, you’ll use a cloud service to create your database. This approach uses ElephatSQL because it offers a free-tier solution. 

Start by creating an account. Once you log in, you’ll be redirected to this view:

# Direct approach

The most straightforward approach is to go to Postgres’s official website. On the “Download” page, specify your operating system and find the steps to download and install Postgres.

# Using Docker

Take a look at another approach using Docker. You won’t need to install or add extra packages to your computer for this approach. Instead, you’ll use Docker to start a Postgres service directly. This approach uses the official Postgres image that can be found on Docker Hub. To start the service, simply launch it using the Docker `run` command:

```shell
docker run --name deno-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres
```

This command is pretty basic. You only need to pass the name and the environment variable `POSTGRES_PASSWORD`, which is mandatory. You can check the official documentation to see if you need to add other variables. Make sure to check that the service is running with `docker ps` command. If everything works as expected, you can skip to the last section, where you connect to the database.

# Using ElephatSQL 

Take a look at how you can install a Postgres service using ElephatSQL. For this approach, you won’t be using any local installation. Instead, you’ll use a cloud service to create your database. This approach uses ElephatSQL because it offers a free-tier solution. 

Start by creating an account. Once you log in, you’ll be redirected to this view:

Learn how to install thePostgres database.

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 Postgres Service

Direct approach

Using Docker