Building a GraphQL Endpoint with Deno Course

Module 1: Introduction to Deno, TypeScript & GraphQL

30 minutes

• Topics: What is Deno? Benefits over Node.js, built-in TypeScript support, GraphQL basics

• Hands-on: Install Deno, run a “Hello, GraphQL” example, explore GraphQL Playground

Module 2: Setting Up Your Deno GraphQL Server

45 minutes

• Topics: HTTP frameworks for Deno (oak), GraphQL middleware (oak-graphql or gql)

• Hands-on: Create a basic /graphql endpoint that responds to simple queries

Module 3: Schema Design & Resolver Implementation

1 hour

• Topics: Defining type definitions, query and mutation structures, resolver functions

• Hands-on: Implement a User type with createUser, getUser, and listUsers operations

Module 4: Integrating PostgreSQL with Deno

45 minutes

• Topics: SQL vs. NoSQL considerations, Deno Postgres client setup, schema migrations

• Hands-on: Connect to PostgreSQL, define tables, and wire resolvers to perform CRUD via SQL

Module 5: Integrating MongoDB with Deno

45 minutes

• Topics: MongoDB driver for Deno, document modeling, collections vs. tables

• Hands-on: Configure a MongoDB connection, define a Post collection, and implement GraphQL resolvers for it

Module 6: Testing & Tooling

30 minutes

• Topics: Writing unit tests for resolvers, using GraphQL Playground, linting and formatting

• Hands-on: Write tests for query/mutation logic and validate schema correctness

Module 7: Deployment & Dockerization

30 minutes

• Topics: Dockerfile for Deno, multi-stage builds, environment variables, Deno Deploy overview

• Hands-on: Containerize your GraphQL service and run it via Docker Compose with linked databases

Module 8: Capstone – Feature Extension & Best Practices

30 minutes

• Topics: Authentication with JWT, pagination, batching, error handling, rate limits

• Hands-on: Add a login mutation with JWT issuance and secure your GraphQL endpoint

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