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

# GraphQL directive
In the last lesson, we learned how to utilize GraphQL variables to filter pizzas based on a keyword entered by the user. Imagine now that our application has grown in popularity. Each pizza now requires a summary and a more thorough description , which also needs additional fields of data. We need a method to dynamically modify the structure and layout of our queries.


GraphQL has a feature called **directive** that allows this. A directive can be appended to a field or fragment and can influence the query’s execution in any way the server chooses. The GraphQL standard contains two default directives that each GraphQL server implementation must support:

- `@include(if: Boolean)`: We include this field if the argument is true.

- `@skip(if: Boolean)` : We skip this field if the argument is true.


## How to make a dynamic query
You need to do three things:
- Using the previous query as a reference, we need to find fields that are conditionally used. We’ll then decide to load the toppings fields if `withToppings` is `True`.

- We need to define `withToppings` as the variable and `Boolean` as the type since the value can only be either true or false. Since it’s mandatory, we also need to remember the exclamation mark (`!`).

- We need to add directives to the `toppings` fields and remember to pass `$withToppings`.


We’re now able to refactor the previous query, reproduced below:

- `@include(if: Boolean)` Include this field only if the argument is true.
- `@skip(if: Boolean)` Skip this field if the argument is true.

## How to make a dynamic query
You need to do three things:
- Using the previous query as a reference, find fields that are conditionally used. Now you will decide to load toppings fields if `withToppings` is `True`
- Define `withToppings` as variablesGraphQL features a feature called a directive that allows for this. A directive can be appended to a field or fragment and can influence the query's execution in any way the server chooses. The GraphQL standard contains two default directives that each GraphQL server implementation must support: and a `Boolean` as the type since the value can only be true or false, and since it's mandatory, don't forget the exclamation mark (`!`).
- Add directives to the `toppings` fields, and don't forget to pass `$withToppings.`

We’re now able to refactor the previous query, reproduced below:


# GraphQL directive
In the last lesson, we learned how to utilize GraphQL variables to filter pizzas based on a keyword entered by the user. Imagine now that our application has grown in popularity. Each pizza now requires a summary and a more thorough description , which also needs additional fields of data. We need a method to dynamically modify the structure and layout of our queries.


GraphQL has a feature called **directive** that allows this. A directive can be appended to a field or fragment and can influence the query’s execution in any way the server chooses. The GraphQL standard contains two default directives that each GraphQL server implementation must support:

- `@include(if: Boolean)`: We include this field if the argument is true.

- `@skip(if: Boolean)` : We skip this field if the argument is true.


## How to make a dynamic query
You need to do three things:
- Using the previous query as a reference, we need to find fields that are conditionally used. We’ll then decide to load the toppings fields if `withToppings` is `True`.

- We need to define `withToppings` as the variable and `Boolean` as the type since the value can only be either true or false. Since it’s mandatory, we also need to remember the exclamation mark (`!`).

- We need to add directives to the `toppings` fields and remember to pass `＄withToppings`.


We’re now able to refactor the previous query, reproduced below:

- `@include(if: Boolean)` Include this field only if the argument is true.
- `@skip(if: Boolean)` Skip this field if the argument is true.

## How to make a dynamic query
You need to do three things:
- Using the previous query as a reference, find fields that are conditionally used. Now you will decide to load toppings fields if `withToppings` is `True`
- Define `withToppings` as variablesGraphQL features a feature called a directive that allows for this. A directive can be appended to a field or fragment and can influence the query's execution in any way the server chooses. The GraphQL standard contains two default directives that each GraphQL server implementation must support: and a `Boolean` as the type since the value can only be true or false, and since it's mandatory, don't forget the exclamation mark (`!`).
- Add directives to the `toppings` fields, and don't forget to pass `＄withToppings.`

We’re now able to refactor the previous query, reproduced below:


Learn about dynamic GraphQL queries that use directives.


Dynamic Query Using Directives

Learn about dynamic GraphQL queries that use directives.

Introduction

Getting to Know GraphQL

Queries

Mutations

Schemas and Types

Schema Validation

Schema Execution

Schema Introspection

GraphQL Best Practices

GraphQL Exam

Dynamic Query Using Directives

GraphQL directive