Ruby GraphQL Server

Interactive Ruby GraphQL server with queries and mutations

A simple GraphQL server built with Ruby and Sinatra.
Features queries for users, mutations for sending messages, and GraphiQL UI.

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Run Locally on Windows

1. Install dependencies (skip production gems like thin):

bundle install --without production

2. Run the server:

ruby app.rb

3. Open in your browser:

http://localhost:4567/

Note: The server can run with either webrick (development) or thin (production).

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Endpoints

Path	Method	Description
/graphql	POST	Main GraphQL endpoint for queries and mutations
/	GET	GraphiQL UI for interactive queries

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GraphQL Queries (Examples)

1. Hello query

{
  hello
}

2. Get all users

{
  users {
    id
    name
    email
  }
}

3. Get a single user by ID

{
  user(id: 2) {
    id
    name
    email
  }
}

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GraphQL Mutation (Example)

Send a message

mutation {
  sendMessage(message: "Hello world!") {
    message
    timestamp
  }
}

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Curl Requests (Windows / Bash examples)

Query Hello

curl -X POST http://localhost:4567/graphql \
  -H "Content-Type: application/json" \
  -d "{\"query\":\"{ hello }\"}"

Query All Users

curl -X POST http://localhost:4567/graphql \
  -H "Content-Type: application/json" \
  -d "{\"query\":\"{ users { id name email } }\"}"

Query Single User

curl -X POST http://localhost:4567/graphql \
  -H "Content-Type: application/json" \
  -d "{\"query\":\"{ user(id: 2) { id name email } }\"}"

Mutation: Send Message

For non-ASCII text (Cyrillic):

curl -X POST http://localhost:4567/graphql \
  -H "Content-Type: application/json" \
  -d "{\"query\":\"mutation { sendMessage(message: \\\"\\u041F\\u0440\\u0438\\u0432\\u0435\\u0442 \\u043C\\u0438\\u0440\\\") { message timestamp } }\"}"

For ASCII text (English):

curl -X POST http://localhost:4567/graphql \
  -H "Content-Type: application/json" \
  -d $'{"query":"mutation { sendMessage(message: \\"Hello world!\\") { message timestamp } }"}'

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Features

• GraphQL Queries: hello, users, user(id: ID)
• GraphQL Mutation: sendMessage(message: String)
• Interactive GraphiQL UI at /
• Runs on Sinatra with webrick (dev) or thin (prod)
• Fully deployed on Render.com

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Technology Stack

• Ruby 3.2.9 – dynamic programming language
• Sinatra 2.2 – lightweight web framework
• Sinatra-contrib – helpers for JSON, reloader, and more
• GraphQL 2.5 – GraphQL implementation for Ruby
• WEBrick – development server (Windows default)
• Thin – production server
• Render.com – zero-config deployment

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