GraphQL by Example from Udemy

More and more teams are choosing GraphQL instead of (or along with) REST for their web APIs. GraphQL queries give clients great flexibility in the way they request data from the server, preventing issues such overfetching or underfetching of data, and allowing multiple resources to be retrieved in a single request.

In this course you'll learn how to use GraphQL both on the server side and in client applications through practical examples in the form of full-stack JavaScript applications. You will be introduced to all the main GraphQL concepts like schema definition, Queries, Mutations, and Subscriptions, as well as to solution to common requirements such as handling authentication/authorization and client-side caching.

The examples use Apollo Server with Node.js and Express on the backend and React on the frontend, with GraphQL-Request first, then Apollo Client as GraphQL clients. GraphQL-WS is used for subscriptions.

The aim however is not just to cover specific GraphQL libraries, but to give you a more general understanding of the underlying concepts. For instance, GraphQL client libraries are introduced only after learning how to write a simple client "by hand", to make sure you understand the GraphQL over HTTP format.

This course assumes good knowledge of modern JavaScript, and ideally some familiarity with Node.js/Express and React.

What's inside

Learning objectives

Build a graphql server based on nodejs, express and apollo server
Call graphql apis from javascript using graphql-request or apollo client

Handle authentication/authorization, caching, and more
Receive real-time updates with graphql subscriptions

Build a graphql server based on nodejs, express and apollo server
Call graphql apis from javascript using graphql-request or apollo client
Handle authentication/authorization, caching, and more
Receive real-time updates with graphql subscriptions

Syllabus

Introduction

What is GraphQL

Required Tools

Course Advice

Fundamentals

Schema Definition

Apollo Server

Query Language

GraphQL Over HTTP

GraphQL Client

Github Repository

Code-First vs Schema-First

Final Code

Schema

Job Board Architecture

Job Board Project

Apollo Server with Express

Custom Object Types

Arrays and Non-Nullability

Database Access

Field Resolvers

Resolver Chain

Documentation Comments

Object Associations

Queries

Starting Code

GraphQL-Request

Component State in React

Query Arguments

Query Variables

Exercise: Company by ID

Bidirectional Associations

Recursive Queries

Errors

GraphQL Errors

Custom Errors

Request States

Mutations

Input Types

Aside: Database Reset

Mutation Requests

Exercise: Delete Job

Exercise: Update Job

Authentication

Authentication Flow

Resolver Context

User-Company Association

Client Authentication

Secure Delete

Exercise: Secure Update

Where to Authenticate

Caching with Apollo Client

Apollo Client Features

Apollo Client Setup

Query Method

Mutate Method and Auth Link

Apollo Client Cache

Fetch Policies

Cache Manipulation

Fragments

Apollo React Integration

useQuery Hook

React Custom Hooks

Exercise: useJob and useJobs

useMutation Hook

useMutation Result

Exercise: useCreateJob

Data Loaders

N+1 Query Problem

Batching with DataLoader

Per-Request Cache

Pagination

Pagination Strategies

Ordering

Limit Clause

Offset Clause

Basic Pagination UI

Total Count

Full Pagination UI

Subscriptions

Chat Project

Cache updateQuery

Subscription Definition

GraphQL-WS Server

Subscription Resolver

GraphQL-WS Client

useSubscription Hook

WebSocket Protocol

Connection Params

Good to know

Know what's good

, what to watch for

, and possible dealbreakers

Examines GraphQL's implementation on the server side as well as client applications, offering a holistic view of its usage

Focuses on practical examples using real-world JavaScript full-stack applications, enhancing comprehension and relevance

Provides hands-on experience with popular GraphQL libraries such as Apollo Server and Apollo Client, ensuring industry-aligned skills

Covers essential GraphQL concepts, including schema definition, mutations, queries, and subscriptions, building a solid foundation

Addresses common authentication, authorization, caching, and performance optimization challenges, equipping students with practical solutions

Requires knowledge of modern JavaScript and familiarity with Node.js/Express and React, indicating a target audience with some technical proficiency

Career center

Learners who complete GraphQL by Example will develop knowledge and skills that may be useful to these careers:

GraphQL Developer

GraphQL Developers specialize in designing, developing, and maintaining GraphQL APIs. This course is a perfect fit for GraphQL Developers, as it covers all the essential concepts and best practices for building GraphQL applications. By taking this course, GraphQL Developers can gain a deep understanding of GraphQL's capabilities and limitations, and learn how to build scalable, performant, and secure GraphQL APIs.

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Software Developer

Software Developers design, develop, and maintain software applications. This course may be helpful for Software Developers who want to specialize in GraphQL development. By learning how to build GraphQL servers and clients, Developers can create applications that are data-centric, performant, and easy to use. Additionally, the course covers best practices for authentication, authorization, and caching, which are essential for building secure and scalable software systems.

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Full-Stack Developer

Full-Stack Developers design, develop, and maintain both the front-end and back-end of web applications. This course may be useful for Full-Stack Developers who want to learn how to build GraphQL applications. GraphQL is a powerful tool for building data-driven web applications, and by learning how to use it effectively, Full-Stack Developers can create applications that are fast, flexible, and easy to maintain.

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Backend Developer

Backend Developers design, develop, and maintain the server-side of web applications. This course may be useful for Backend Developers who want to learn how to build GraphQL APIs. GraphQL is a powerful tool for building data-centric APIs, and by learning how to use it effectively, Backend Developers can create APIs that are fast, flexible, and easy to use.

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Web Developer

Web Developers design, develop, and maintain websites and web applications. This course may be useful for Web Developers who want to add GraphQL to their skillset. GraphQL is a powerful tool for building data-driven web applications, and by learning how to use it effectively, Web Developers can create applications that are fast, flexible, and easy to maintain.

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Database Administrator

Database Administrators design, implement, and maintain databases. This course may be useful for Database Administrators who want to learn how to build GraphQL APIs that access data from databases. GraphQL is a powerful tool for building data-centric APIs, and by learning how to use it effectively, Database Administrators can create APIs that are fast, flexible, and easy to use.

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Product Manager

Product Managers design, develop, and launch new products. This course may be useful for Product Managers who want to learn how to use GraphQL to build data-driven products. GraphQL is a powerful tool for building data-centric applications, and by learning how to use it effectively, Product Managers can create products that are fast, flexible, and easy to use.

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Business Analyst

Business Analysts help businesses understand and improve their processes. This course may be useful for Business Analysts who want to learn how to use GraphQL to access and manipulate data. GraphQL is a powerful tool for data query and manipulation, and by learning how to use it effectively, Business Analysts can build data-driven applications that are fast, flexible, and easy to use.

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Data Analyst

Data Analysts collect, analyze, and interpret data to help businesses make better decisions. This course may be useful for Data Analysts who want to learn how to use GraphQL to access and manipulate data. GraphQL is a powerful tool for data query and manipulation, and by learning how to use it effectively, Data Analysts can build data-driven applications that are fast, flexible, and easy to use.

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Data Scientist

Data Scientists use data to solve business problems. This course may be useful for Data Scientists who want to learn how to use GraphQL to access and manipulate data. GraphQL is a powerful tool for data query and manipulation, and by learning how to use it effectively, Data Scientists can build data-driven applications that are fast, flexible, and easy to use.

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Machine Learning Engineer

Machine Learning Engineers design, develop, and maintain machine learning models. This course may be useful for Machine Learning Engineers who want to learn how to use GraphQL to access and manipulate data. GraphQL is a powerful tool for data query and manipulation, and by learning how to use it effectively, Machine Learning Engineers can build data-driven machine learning models that are fast, flexible, and easy to use.

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IT Consultant

IT Consultants help businesses plan, implement, and manage their IT systems. This course may be useful for IT Consultants who want to learn how to use GraphQL to build data-driven IT solutions. GraphQL is a powerful tool for building data-centric applications, and by learning how to use it effectively, IT Consultants can create solutions that are fast, flexible, and easy to use.

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Project Manager

Project Managers plan, execute, and close projects. This course may be useful for Project Managers who want to learn how to use GraphQL to manage project data. GraphQL is a powerful tool for data query and manipulation, and by learning how to use it effectively, Project Managers can build data-driven project management tools that are fast, flexible, and easy to use.

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Technical Writer

Technical Writers create user guides, manuals, and other documentation for software and hardware products. This course may be useful for Technical Writers who want to learn how to write documentation for GraphQL applications. GraphQL is a powerful tool for building data-centric applications, and by learning how to use it effectively, Technical Writers can create documentation that is clear, concise, and easy to follow.

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Data Architect

A Data Architect plans and designs the architecture of data systems, ensuring that data is structured, organized, and accessible to meet the needs of an organization. This course may be useful for Data Architects, as it provides a solid foundation in GraphQL, a powerful tool for data query and manipulation. By understanding GraphQL's concepts and capabilities, Data Architects can design and implement data systems that are flexible, efficient, and scalable.

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GraphQL by Example

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