📁 GraphQL API — All in One Postman Guide

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🔹 Tech Stack

• Node.js
• Apollo Server
• GraphQL
• JWT Authentication
• Mongoose/Mongodb

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🔹 Environment Variables

Create a .env file in your root directory:

SECRET_KEY=your_secret_key
DB_URI=mongodb+srv://yourUsername:yourPass@yourCluster.example/test
PORT=4000

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🔹 Installation

git clone <your-repo-url>
cd your-repo
npm install

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🔹 Run the Application

    npm start

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🔹 Auth Notes

• Signup and login are public
• All other operations require Authorization:Bearer YOUR-JWT-TOKEN

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🔹 API Operations

🔹 Signup (POST)

• URL: http://localhost:4000/graphql
• Body (GraphQL):

{
  "query": "mutation ($username: String!, $email: String, $password: String!) { signup(username: $username, email: $email, password: $password) { message } }",
  "variables": { "username": "foo", "email": "foo@example.com", "password": "123123" }
}

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🔹 Login (POST)

• URL: http://localhost:4000/graphql
• Body (GraphQL):

{
  "query": "mutation ($username: String!, $password: String!) { login(username: $username, password: $password) { token message } }",
  "variables": { "username": "foo", "password": "123123" }
}

🔹 Add Book (POST)

• URL: http://localhost:4000/graphql
• Headers: Authorization: Bearer YOUR-JWT-TOKEN
• Content-Type: application/json
• Body (GraphQL):

{
  "query": "mutation ($title: String!, $author: String!) { addBook(title: $title, author: $author) { id title author } }",
  "variables": { "title": "New Title", "author": "Author Name" }
}

🔹 Get All Books (POST)

• URL: http://localhost:4000/graphql
• Headers: Authorization: Bearer YOUR-JWT-TOKEN
• Content-Type: application/json
• Body (GraphQL):

{
  "query": "query { books { id title author } }"
}

🔹 Get Book by ID (POST)

• URL: http://localhost:4000/graphql
• Headers: Authorization: Bearer YOUR-JWT-TOKEN
• Content-Type: application/json
• Body (GraphQL):

{
  "query": "query ($id: ID!) { book(id: $id) { id title author } }",
  "variables": { "id": "<your-book-id>" }
}

🔹 Update Book (POST)

• URL: http://localhost:4000/graphql
• Headers: Authorization: Bearer YOUR-JWT-TOKEN
• Content-Type: application/json
• Body (GraphQL):

{
  "query": "mutation ($id: ID!, $title: String!, $author: String!) { updateBook(id: $id, title: $title, author: $author) { id title author } }",
  "variables": { "id": "<your-book-id>", "title": "Updated Title", "author": "Updated Author" }
}

🔹 Delete Book (POST)

• URL: http://localhost:4000/graphql
• Headers: Authorization: Bearer YOUR-JWT-TOKEN
• Content-Type: application/json
• Body (GraphQL):

{
  "query": "mutation ($id: ID!) { deleteBook(id: $id) { message } }",
  "variables": { "id": "<your-book-id>" }
}