GraphQL is a query language for APIs with this client can define what they need and server get exactly that, nothing more and nothing less.

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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

Let’s say our customer base has grown, and our new clients require more information. For example, the clients want to compare pizzas side-by-side while also looking at the available toppings. This operation would need us to repeat the fields at least once for each comparison.


## GraphQL fragments
GraphQL fragments allow us to build sets of fields and then use them in queries as needed.


### How to convert repetitive GraphQL queries
Before we start working with GraphQL fragments, we need to do the following:


- Find the repeated fields that are used in multiple places.

- Declare all the fields that are used as fragments.

- Replace earlier fields with one of the fragments that we defined and use spread [syntax.](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax) 

Now, we’ll be able to refactor the previous query. We’ve reproduced it below:



Let’s say our customer base has grown, and our new clients require more information. For example, the clients want to compare pizzas side-by-side while also looking at the available toppings. This operation would need us to repeat the fields at least once for each comparison.


# GraphQL fragments
GraphQL fragments allow us to build sets of fields and then use them in queries as needed.


## How to convert repetitive GraphQL queries
Before we start working with GraphQL fragments, we need to do the following:


- Find the repeated fields that are used in multiple places.

- Declare all the fields that are used as fragments.

- Replace earlier fields with one of the fragments that we defined and use spread [syntax.](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax) 

Now, we’ll be able to refactor the previous query. We’ve reproduced it below:



Learn about the GraphQL fragments used to prevent duplication of GraphQL queries.


Create Reusable Query Units and  Fields Using Fragments

Learn about the GraphQL fragments used to prevent duplication of GraphQL queries.

Introduction

Getting to Know GraphQL

Queries

Mutations

Schemas and Types

Schema Validation

Schema Execution

Schema Introspection

GraphQL Best Practices

GraphQL Exam

Create Reusable Query Units and Fields Using Fragments

GraphQL fragments

How to convert repetitive GraphQL queries