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

So far, we’ve learned how to fetch data from servers using GraphQL. But in the production environment, we also need a way to apply the change to server-side data.


## GraphQL mutation

In GraphQL, not every request has side effects on the server. Technically, any query could implement a function to modify server data. However, this is considered bad practice. Any operation that causes write should be sent explicitly via `mutation` operation type.

Similar to queries, the mutation field returns an object type. Let’s look at the mutation that’s available on our GraphQL server.


So far, we’ve learned how to fetch data from servers using GraphQL. But in the production environment, we also need a way to apply the change to server-side data.


# GraphQL mutation

In GraphQL, not every request has side effects on the server. Technically, any query could implement a function to modify server data. However, this is considered bad practice. Any operation that causes write should be sent explicitly via `mutation` operation type.

Similar to queries, the mutation field returns an object type. Let’s look at the mutation that’s available on our GraphQL server.


Understand insert, delete, and update operations on GraphQL.


Introduction

Getting to Know GraphQL

Queries

Mutations

Schemas and Types

Schema Validation

Schema Execution

Schema Introspection

GraphQL Best Practices

GraphQL Exam

Single Mutation

GraphQL mutation