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TypeScript Academy · Lesson

Setting Up TypeScript with Node.js

Configure tsconfig for a Node.js backend project.

Setting Up TypeScript with Node.js is a free TypeScript Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the TypeScript Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

Welcome

Learn how to configure TypeScript for a Node.js backend project.

Initialize Project

Create package.json and install TypeScript with Node types.
npm init -y
npm install --save-dev typescript @types/node ts-node

tsconfig for Node

Configure tsconfig.json for a Node.js CommonJS project.
{
  "compilerOptions": {
    "target": "ES2020",
    "module": "commonjs",
    "outDir": "./dist",
    "strict": true,
    "esModuleInterop": true
  }
}

Running with ts-node

Use ts-node or tsx for development without a compile step.
npx ts-node src/index.ts
npx tsx watch src/index.ts

Production Build

Compile TypeScript to JavaScript for production.
npx tsc
node dist/index.js

Source Maps for Debugging

Enable source maps to map errors back to TypeScript lines.
{ "compilerOptions": { "sourceMap": true } }

Environment Variables

Use process.env with @types/node for typed environment access.
const port = process.env.PORT ?? '3000';

Path Aliases

Configure path aliases for cleaner imports.
{ "compilerOptions": { "paths": { "@/*": ["src/*"] } } }

Nodemon Integration

Use nodemon with ts-node for auto-restart on changes.
{ "watch": ["src"], "exec": "ts-node src/index.ts" }

ESM Configuration

For ESM modules in Node.js, set module to NodeNext.
{ "compilerOptions": { "module": "NodeNext" } }

Type-Safe Config Loading

Load and validate config files with typed interfaces.
interface AppConfig { port: number; db: string; }
const config: AppConfig = require('./config.json');

Quick Check

What is the main benefit of using @types/express in a TypeScript project?

Recap

Setting Up TypeScript with Node.js: type Request/Response generics for params, body, and query. Extend Request via module augmentation for custom properties. Type middleware and error handlers with their specific signatures.

Frequently asked questions

Is the “Setting Up TypeScript with Node.js” lesson free?

Yes — the full text of “Setting Up TypeScript with Node.js” is free to read here on the web, and the TypeScript Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the TypeScript Academy course, upgrade to CoddyKit PRO.

What will I learn in “Setting Up TypeScript with Node.js”?

Configure tsconfig for a Node.js backend project. You practise TypeScript Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start TypeScript Academy?

No prior experience is required. TypeScript Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Setting Up TypeScript with Node.js” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this TypeScript Academy lesson?

Yes. Every TypeScript Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Setting Up TypeScript with Node.js
  2. Typing Express Request and Response
  3. Typed Middleware and Error Handlers
  4. Environment Variables and Config Typing
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