HTML

HTML is Dokka's default and recommended output format. It is currently in Beta and approaching the Stable release.

You can see an example of the output by browsing documentation for kotlinx.coroutines.

Generate HTML documentation

HTML as an output format is supported by all runners. To generate HTML documentation, follow these steps depending on your build tool or runner:

• For Gradle, run dokkaHtml or dokkaHtmlMultiModule tasks.
• For Maven, run the dokka:dokka goal.
• For CLI runner, run with HTML dependencies set.

HTML pages generated by this format need to be hosted on a web server in order to render everything correctly.

You can use any free static site hosting service, such as GitHub Pages.

Locally, you can use the built-in IntelliJ web server.

Configuration

HTML format is Dokka's base format, so it is configurable through DokkaBase and DokkaBaseConfiguration classes:

【Kotlin】

Via type-safe Kotlin DSL:

import org.jetbrains.dokka.base.DokkaBase
import org.jetbrains.dokka.gradle.DokkaTask
import org.jetbrains.dokka.base.DokkaBaseConfiguration

buildscript {
    dependencies {
        classpath("org.jetbrains.dokka:dokka-base:1.9.20")
    }
}

tasks.withType<DokkaTask>().configureEach {
    pluginConfiguration<DokkaBase, DokkaBaseConfiguration> {
        customAssets = listOf(file("my-image.png"))
        customStyleSheets = listOf(file("my-styles.css"))
        footerMessage = "(c) 2022 MyOrg"
        separateInheritedMembers = false
        templatesDir = file("dokka/templates")
        mergeImplicitExpectActualDeclarations = false
    }
}

Via JSON:

import org.jetbrains.dokka.gradle.DokkaTask

tasks.withType<DokkaTask>().configureEach {
    val dokkaBaseConfiguration = """
    {
      "customAssets": ["${file("assets/my-image.png")}"],
      "customStyleSheets": ["${file("assets/my-styles.css")}"],
      "footerMessage": "(c) 2022 MyOrg",
      "separateInheritedMembers": false,
      "templatesDir": "${file("dokka/templates")}",
      "mergeImplicitExpectActualDeclarations": false
    }
    """
    pluginsMapConfiguration.set(
        mapOf(
            // fully qualified plugin name to json configuration
            "org.jetbrains.dokka.base.DokkaBase" to dokkaBaseConfiguration
        )
    )
}

【Groovy】

import org.jetbrains.dokka.gradle.DokkaTask

tasks.withType(DokkaTask.class) {
    String dokkaBaseConfiguration = """
    {
      "customAssets": ["${file("assets/my-image.png")}"],
      "customStyleSheets": ["${file("assets/my-styles.css")}"],
      "footerMessage": "(c) 2022 MyOrg"
      "separateInheritedMembers": false,
      "templatesDir": "${file("dokka/templates")}",
      "mergeImplicitExpectActualDeclarations": false
    }
    """
    pluginsMapConfiguration.set(
            // fully qualified plugin name to json configuration
            ["org.jetbrains.dokka.base.DokkaBase": dokkaBaseConfiguration]
    )
}

【Maven】

<plugin>
    <groupId>org.jetbrains.dokka</groupId>
    <artifactId>dokka-maven-plugin</artifactId>
    ...
    <configuration>
        <pluginsConfiguration>
            <!-- Fully qualified plugin name -->
            <org.jetbrains.dokka.base.DokkaBase>
                <!-- Options by name -->
                <customAssets>
                    <asset>${project.basedir}/my-image.png</asset>
                </customAssets>
                <customStyleSheets>
                    <stylesheet>${project.basedir}/my-styles.css</stylesheet>
                </customStyleSheets>
                <footerMessage>(c) MyOrg 2022 Maven</footerMessage>
                <separateInheritedMembers>false</separateInheritedMembers>
                <templatesDir>${project.basedir}/dokka/templates</templatesDir>
                <mergeImplicitExpectActualDeclarations>false</mergeImplicitExpectActualDeclarations>
            </org.jetbrains.dokka.base.DokkaBase>
        </pluginsConfiguration>
    </configuration>
</plugin>

【CLI】

Via command line options:

java -jar dokka-cli-1.9.20.jar \
     ...
     -pluginsConfiguration "org.jetbrains.dokka.base.DokkaBase={\"customAssets\": [\"my-image.png\"], \"customStyleSheets\": [\"my-styles.css\"], \"footerMessage\": \"(c) 2022 MyOrg\", \"separateInheritedMembers\": false, \"templatesDir\": \"dokka/templates\", \"mergeImplicitExpectActualDeclarations\": false}
"

Via JSON configuration:

{
  "moduleName": "Dokka Example",
  "pluginsConfiguration": [
    {
      "fqPluginName": "org.jetbrains.dokka.base.DokkaBase",
      "serializationFormat": "JSON",
      "values": "{\"customAssets\": [\"my-image.png\"], \"customStyleSheets\": [\"my-styles.css\"], \"footerMessage\": \"(c) 2022 MyOrg\", \"separateInheritedMembers\": false, \"templatesDir\": \"dokka/templates\", \"mergeImplicitExpectActualDeclarations\": false}"
    }
  ]
}

Configuration options

The table below contains all of the possible configuration options and their purpose.

For more information about configuring Dokka plugins, see Configuring Dokka plugins.

Customization

To help you add your own look and feel to your documentation, the HTML format supports a number of customization options.

Customize styles

You can use your own stylesheets by using the customStyleSheets configuration option. These are applied to every page.

It's also possible to override Dokka's default stylesheets by providing files with the same name:

The source code for all of Dokka's stylesheets is available on GitHub.

Customize assets

You can provide your own images to be bundled with documentation by using the customAssets configuration option.

These files are copied to the <output>/images directory.

It's possible to override Dokka's images and icons by providing files with the same name. The most useful and relevant one being logo-icon.svg, which is the image that's used in the header. The rest is mostly icons.

You can find all images used by Dokka on GitHub.

Change the logo

To customize the logo, you can begin by providing your own asset for logo-icon.svg.

If you don't like how it looks, or you want to use a .png file instead of the default .svg file, you can override the logo-styles.css stylesheet to customize it.

For an example of how to do this, see our custom format example project.

Modify the footer

You can modify text in the footer by using the footerMessage configuration option.

Templates

Dokka provides the ability to modify FreeMarker templates used for generating documentation pages.

You can change the header completely, add your own banners/menus/search, load analytics, change body styling and so on.

Dokka uses the following templates:

The base template is base.ftl and it includes all of the remaining listed templates. You can find the source code for all of Dokka's templates on GitHub.

You can override any template by using the templatesDir configuration option. Dokka searches for the exact template names within the given directory. If it fails to find user-defined templates, it uses the default templates.

Variables

The following variables are available inside all templates:

Variables projectName and pathToRoot are available only within the template_cmd directive as they require more context and thus they need to be resolved at later stages by the MultiModule task:

<@template_cmd name="projectName">
   <span>${projectName}</span>
</@template_cmd>

Directives

You can also use the following Dokka-defined directives: