Gain insights into GraphQL's architecture and methodology. Learn about setting up servers, performing complex queries, and updating data with mutations using Apollo Server and Node.js. Discover practical deployment.

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GraphQL is a query language for web APIs and a runtime for fulfilling queries with existing data. GraphQL gives clients the power to ask for precisely what they need, making it easy to evolve APIs with powerful developer tools.

This course is an introduction to GraphQL using the Node.js JavaScript runtime environment and Apollo Server. You’ll start with an introduction to GraphQL’s architecture and functions before exploring the structure of GraphQL data and learning to perform meaningful, complex queries. You’ll then learn how to update server data using mutations. Next, you’ll explore the GraphQL type system and schemas to set up a GraphQL server using Apollo Server. Once the server is set up, you’ll implement a full GraphQL application using Apollo and Node.js.

By the end of this course, you’ll have a rich understanding of GraphQL’s architecture and methodology and be prepared to deploy GraphQL applications to the web using Apollo and Node.js.

Getting Started with GraphQL using Node.js

In the previous lesson, we learned how the schema interface in GraphQL could be used to ensure that `Pizza` always represents a mandatory set of types. Union types are similar to interfaces, but they don’t specify any standard fields between the types.


## How to implement union types in GraphQL server
To implement union in the GraphQL server, you need to follow these steps:
- Edit the `typeDefs` variable and add the `VariousPizza` as `enum` with types `Pizza`, `ChicagoPizza`, and `DominoPizza`.


In the previous lesson, we learned how the schema interface in GraphQL could be used to ensure that `Pizza` always represents a mandatory set of types. Union types are similar to interfaces, but they don’t specify any standard fields between the types.


# How to implement union types in GraphQL server
To implement union in the GraphQL server, you need to follow these steps:
- Edit the `typeDefs` variable and add the `VariousPizza` as `enum` with types `Pizza`, `ChicagoPizza`, and `DominoPizza`.


Introduction

Getting to Know GraphQL

Queries

Mutations

Schemas and Types

Schema Validation

Schema Execution

Schema Introspection

GraphQL Best Practices

GraphQL Exam

Schema with Union Types

How to implement union types in GraphQL server