📚 GraphQL Backend – Publishers, Authors & Books

This project is a GraphQL API built with Express.js and Apollo Server. It demonstrates how to manage relationships between Publishers, Authors, and Books with Queries & Mutations including full CRUD operations.

🚀 Features

⚡ GraphQL API with Express + Apollo Server

🔎 Queries:

Get all publishers, authors, and books

Get a single publisher, author, or book by ID

✍️ Mutations:

Add, Edit, and Delete Publishers, Authors, and Books

📦 In-memory data storage (easy to swap with a database later)

📂 Project Structure graphql-backend/ │── package.json │── server.js # Entry point │── schema.js # GraphQL typeDefs │── resolvers.js # Query & Mutation resolvers

📦 Installation

Clone the repo:

git clone https://github.com/your-username/graphql-backend.git cd graphql-backend

Install dependencies:

npm install express apollo-server-express graphql npm install --save-dev nodemon

▶️ Running the Server

Start the server in development mode:

npm run dev

or with plain Node.js:

node server.js

By default, the server runs at:

http://localhost:4000/graphql

🛠 Example Queries Get all authors with their books query { authors { id name books { title } } }

Get a single book by ID query { book(id: "1") { id title publishedYear } }

✍️ Example Mutations Add a new Publisher mutation { addPublisher(name: "O’Reilly", location: "USA") { id name location } }

Edit an Author mutation { updateAuthor(id: "2", name: "Updated Name") { id name } }

Delete a Book mutation { deleteBook(id: "3") { id title } }

🧪 Using Apollo Sandbox

Once the server is running, open: 👉 http://localhost:4000/graphql

Apollo Sandbox will load in your browser where you can test Queries & Mutations interactively.