Curl Examples

Query Hello

curl -X POST http://localhost:8080/graphql \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer secret-token" \
  -d "{\"query\":\"query Hello { hello }\",\"operationName\":\"Hello\"}"

Query All Users

curl -X POST http://localhost:8080/graphql \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer secret-token" \
  -d "{\"query\":\"query GetUsers { users { id name email } }\",\"operationName\":\"GetUsers\"}"

Query Single User

curl -X POST http://localhost:8080/graphql \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer secret-token" \
  -d "{\"query\":\"query GetUser { user(id: \\\"2\\\") { id name email } }\",\"operationName\":\"GetUser\"}"

Mutation: Send Message

curl -X POST http://localhost:8080/graphql \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer secret-token" \
  -d "{\"query\":\"mutation SendMessage { sendMessage(message: \\\"Hello from curl\\\") { message timestamp } }\",\"operationName\":\"SendMessage\"}"

Notes / Example Logs

When running the server and executing queries or mutations, you will see logs like:

➡️ Incoming GraphQL request: Hello
⏱️ GraphQL [Hello] executed in 2ms
✅ Request executed successfully

➡️ Incoming GraphQL request: GetUsers
⏱️ GraphQL [GetUsers] executed in 1ms
✅ Request executed successfully

➡️ Incoming GraphQL request: GetUser
⏱️ GraphQL [GetUser] executed in 0ms
✅ Request executed successfully

➡️ Incoming GraphQL request: SendMessage
⏱️ GraphQL [SendMessage] executed in 1ms
✅ Request executed successfully

This demonstrates:

• Operation names appear instead of anonymous
• Execution time is logged for each request
• Success or errors are immediately visible

Features

GraphQL Schema (src/schema.ts)

• Defines GraphQL types, queries, and mutations using SDL (buildSchema)
• User type: id, name, email
• Message type: message, timestamp
• Queries: hello, users, user(id: ID!)
• Mutation: sendMessage(message: String!)
• Resolvers: functions in root return static data for queries and generate timestamps for mutations

Envelop Plugins (src/server.ts)

• useEngine: integrates GraphQL execution engine
• useValidationCache: caches validation results for repeated queries
• useTiming: logs execution time of GraphQL requests
• useLogger: logs incoming requests, operation names, and errors or success
• useAuth: reads Authorization header and attaches user to context; blocks unauthenticated requests

Server (src/server.ts)

• Uses native http module for serving GraphQL and GraphiQL UI
• GET / serves GraphiQL interface
• POST /graphql parses JSON body, executes GraphQL queries using Envelop, and returns JSON responses
• Fully written in TypeScript with typed context (MyContext)

TODO / Improvements

• Move secret token to environment variable
  Avoid hardcoding the Bearer token in the code. Use process.env.AUTH_TOKEN for security.

• Add role-based authorization
  Extend useAuth plugin to handle multiple roles (admin, user, guest) for more granular access control.

• Implement rate limiting
  Prevent abuse of the GraphQL endpoint by limiting request rate per IP or user.

• Enable logging to file
  Instead of only console logging, save logs to a file or use a logging library like winston for production monitoring.

• Add input validation
  Validate mutation inputs and query arguments before execution to avoid runtime errors and improve security.

• Add more Envelop plugins
  Consider using plugins for depth limiting, query complexity, and error masking to improve security and performance.

• Set up environment-specific configuration
  Use .env or a configuration library to manage different environments (development, staging, production).

• Enable CORS
  Allow cross-origin requests if the server will be accessed from different frontends.

• Add tests
  Write unit and integration tests for resolvers, plugins, and the server endpoints.

• Add GraphQL subscriptions (optional)
  If real-time features are needed, implement subscriptions using WebSocket transport with Envelop.

Technology Stack

• Node.js >=22 – JavaScript runtime
• graphql 16.x – Official GraphQL implementation for Node.js
• http – Native HTTP server
• GraphiQL – Embedded interactive IDE
• Envelop – Plugin system for GraphQL
• TypeScript – Strict type-checking and compiler options
• Render.com – Zero-config deployment

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