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

By leveraging the type system, we can determine the validity of any query. The system allows servers and clients to notify developers when they send GraphQL queries without relying on runtime checks.


## Can't spread fragment 
A fragment can’t refer to itself since this could cause an unbounded result. Here’s the `pizzas` query with an invalid GraphQL fragment:


By leveraging the type system, we can determine the validity of any query. The system allows servers and clients to notify developers when they send GraphQL queries without relying on runtime checks.


# Can't spread fragment 
A fragment can’t refer to itself since this could cause an unbounded result. Here’s the `pizzas` query with an invalid GraphQL fragment:


Learn how the GraphQL server validates queries from the client.

Introduction

Getting to Know GraphQL

Queries

Mutations

Schemas and Types

Schema Validation

Schema Execution

Schema Introspection

GraphQL Best Practices

GraphQL Exam

Validate GraphQL Query

Can’t spread fragment