TypeDoc for TypeScript: Complete Guide with Examples

What is TypeDoc and why do you need it?

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TypeDoc is a powerful documentation generator for TypeScript projects. It automatically creates beautiful, structured HTML pages based on your code comments written in JSDoc format. If you've ever written TypeScript code and wanted to quickly get documentation similar to the official TypeScript documentation or popular libraries, TypeDoc is exactly what you need.

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Why do you need it? In modern development, documentation is not a luxury but a necessity. TypeDoc solves several key tasks:

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• Automation: You don't need to write documentation manually. Just add comments to functions, classes, interfaces, and types, and TypeDoc will generate a ready-made site.
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• Relevance: Documentation always matches the code since it is generated directly from it.
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• Navigation: TypeDoc creates convenient project navigation: a tree structure, search, and type links.
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• TypeScript support: It understands complex TypeScript types: generics, utility types, function overloads, modules, and namespaces.
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• Extensibility: TypeDoc supports themes, plugins, and customization.
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TypeDoc is ideal for:

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• Libraries and packages distributed via npm.
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• Internal projects where you need to quickly onboard new developers.
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• API documentation for server-side TypeScript applications.
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• Educational projects where clarity is important.
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Installing TypeDoc

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TypeDoc is installed via npm (Node Package Manager). Make sure you have Node.js installed (version 14 or higher).

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The simplest way is to install TypeDoc globally:

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npm install -g typedoc

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However, for projects, it is recommended to install it as a local development dependency:

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npm install --save-dev typedoc

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After installation, you can check the version:

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npx typedoc --version

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If you use Yarn:

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yarn add -D typedoc

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For pnpm:

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pnpm add -D typedoc

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Quick start with a code example

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Let's create a simple project and generate documentation for it.

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Step 1: Create a project

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mkdir my-typedoc-project\ncd my-typedoc-project\nnpm init -y

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Step 2: Install TypeDoc

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npm install --save-dev typedoc

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Step 3: Create a code file src/index.ts

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/**\n * Module for working with mathematical operations.\n * @module MathUtils\n */\n\n/**\n * Adds two numbers.\n * @param a - The first number\n * @param b - The second number\n * @returns The sum of a and b\n * @example\n * ```typescript\n * const result = add(2, 3);\n * console.log(result); // 5\n * ```\n */\nexport function add(a: number, b: number): number {\n    return a + b;\n}\n\n/**\n * Subtracts the second number from the first.\n * @param a - The minuend\n * @param b - The subtrahend\n * @returns The difference of a and b\n */\nexport function subtract(a: number, b: number): number {\n    return a - b;\n}\n\n/**\n * Interface for representing a point in two-dimensional space.\n */\nexport interface Point {\n    /** X coordinate */\n    x: number;\n    /** Y coordinate */\n    y: number;\n}\n\n/**\n * Calculates the distance between two points.\n * @param p1 - The first point\n * @param p2 - The second point\n * @returns The distance between points\n */\nexport function distance(p1: Point, p2: Point): number {\n    const dx = p2.x - p1.x;\n    const dy = p2.y - p1.y;\n    return Math.sqrt(dx * dx + dy * dy);\n}

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