1. What It Is and Why You Need It

Dokka is a modern documentation generation engine for the Kotlin language, developed by JetBrains. Unlike traditional JavaDoc, Dokka understands Kotlin specifics: null-safety, extension functions, properties, coroutines, sealed classes, and other unique language constructs. If you are writing a library or API in Kotlin, Dokka allows you to automatically create readable, structured documentation in HTML, Markdown, Javadoc, or even JSON formats for further processing.

Why is it needed? First, Dokka significantly simplifies documentation maintenance in large projects — just write KDoc comments (similar to JavaDoc but with Markdown support) in the code, and the utility will generate a ready-made site. Second, Dokka can combine documentation from multiple Gradle or Maven modules into a single project, which is critical for multi-module libraries. Third, it supports customization through templates and plugins, allowing you to adapt the appearance to your corporate style.

Dokka is actively used in the official Kotlin documentation (kotlinlang.org), in libraries such as Ktor, Exposed, Kotlinx.serialization, and many others. It is the de facto standard for documenting Kotlin projects, and if you want your library to look professional — Dokka is a must-learn.

2. Installation

Dokka is distributed as a plugin for Gradle and Maven build systems. There is no separate pip or npm command, as it is a tool for the JVM ecosystem. Below are precise instructions for Gradle (Kotlin DSL) — the most popular method.

Gradle (Kotlin DSL) — Plugin for a Single Module

Add to build.gradle.kts:

plugins {\n    id("org.jetbrains.dokka") version "1.9.20"\n}\n\ndependencies {\n    // Your dependencies\n}\n\n// Basic configuration (optional)\ntasks.withType<org.jetbrains.dokka.gradle.DokkaTask>() {\n    outputDirectory.set(file("$buildDir/dokka"))\n}

Gradle (Groovy DSL)

plugins {\n    id "org.jetbrains.dokka" version "1.9.20"\n}

Maven

<plugin>\n    <groupId>org.jetbrains.dokka</groupId>\n    <artifactId>dokka-maven-plugin</artifactId>\n    <version>1.9.20</version>\n    <executions>\n        <execution>\n            <phase>pre-site</phase>\n            <goals>\n                <goal>dokka</goal>\n            </goals>\n        </execution>\n    </executions>\n</plugin>

After configuration, run the command:

./gradlew dokkaHtml       # for HTML\n./gradlew dokkaGfm        # for Markdown (GFM)\n./gradlew dokkaJavadoc    # for Javadoc style

3. Quick Start — Minimal Working Example

Create a simple Kotlin file with KDoc comments:

// src/main/kotlin/com/example/Calculator.kt\npackage com.example\n\n/**\n * A simple calculator demonstrating Dokka functionality.\n *\n * @author PythonLib Team\n * @since 1.0.0\n */\nclass Calculator {\n\n    /**\n     * Adds two numbers.\n     *\n     * @param a the first addend\n     * @param b the second addend\n     * @return the sum of a and b\n     */\n    fun add(a: Int, b: Int): Int = a + b\n\n    /**\n     * Divides one number by another.\n     *\n     * @param a the dividend\n     * @param b the divisor (cannot be zero)\n     * @return the result of division\n     * @throws IllegalArgumentException if b == 0\n     */\n    fun divide(a: Double, b: Double): Double {\n        require(b != 0.0) { "Divisor cannot be zero" }\n        return a / b\n