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.

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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

## What is GraphiQL?

**GraphiQL** is an #key# IDE: Integrated Development Environment #key# used to run and test our GraphQL queries and mutations. It can also show the schema and be used as a documentation tool. 

In 2020, the GraphQL team announced that the GraphQL playground and GraphiQL are merging. All code and future updates are located in the GraphiQL GitHub repository. Going further, let’s consider the GraphiQL project as our IDE, and use their playground to get familiar with the tool before creating our own GraphQL endpoint.

The GraphiQL project is a set of packages and tools to aid us in our GraphQL development. In this lesson, we’ll take a quick look at GraphiQL with Deno, which offers multiple features like:

- A reliable playground to test a GraphQL server.
- Documentation for a GraphQL endpoint using the defined schema.
- Multiple tabs and history to navigate easily between different requests.
- Error highlighting so we can detect any errors before we send the query.


# What is GraphiQL?

**GraphiQL** is an #key# IDE: Integrated Development Environment #key# used to run and test our GraphQL queries and mutations. It can also show the schema and be used as a documentation tool. 

In 2020, the GraphQL team announced that the GraphQL playground and GraphiQL are merging. All code and future updates are located in the GraphiQL GitHub repository. Going further, let’s consider the GraphiQL project as our IDE, and use their playground to get familiar with the tool before creating our own GraphQL endpoint.

The GraphiQL project is a set of packages and tools to aid us in our GraphQL development. In this lesson, we’ll take a quick look at GraphiQL with Deno, which offers multiple features like:

- A reliable playground to test a GraphQL server.
- Documentation for a GraphQL endpoint using the defined schema.
- Multiple tabs and history to navigate easily between different requests.
- Error highlighting so we can detect any errors before we send the query.


Learn how to use GraphiQL to run and test the GraphQL queries and mutations.

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

GraphQL Playground

What is GraphiQL?