Automated API documentation for Ktor/JVM servers
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README.md

Ktor-Docs JitPack Discord

This library automatically generates REST API documentation for Ktor/JVM projects and hosts it under a specified URL.

Screenshots

Endpoint Auth Info
img img

Installation

The :docs module is published on JitPack, which you can add to your project by copying the following to your root build.gradle at the end of "repositories".

allprojects {
  repositories {
    ...
    maven { url 'https://jitpack.io' }
  }
}

To add the dependency to a module, copy this line into your program's build.gradle file.

implementation "dev.horrific.code.james:ktordocs:$ktordocs_version"

Usage

First, you must install the ktor feature - replacing the default configuration with your project's values.

install(RestDocsFeature) {
    baseUrl = "https://example.com"
    title = "Example API"
    desc = "Basic documentation generated for testing & demo purposes."
}

Documentation can then be specified in any endpoint/request handler by invoking the docs() function at the start of its callback. (this function will not do anything during normal requests, and should not have any effect on performance)

get("/api/v1/example") {
    docs {
        title = "Hello World"
        desc = "Says hello to the world."
    }

    call.respondText("Hello world!")
}

Finally, choose a location to host the documentation at using restDocumentation(path)

route("/api") {
    restDocumentation("/docs")
}

Endpoint Parameters

The library will automatically generate a list of URL parameters by parsing the endpoint URL - however, more information can be specified using the param(...) function...

get("/api/user/{username}") {
    docs {
        param("username") { // a URL property
            type = "SHA1 hash"
            desc = "A unique identifier of a user."
        }
        param("fetchAll") { // a query parameter (/?fetchAll=true)
            type = "boolean"
            desc = "Whether to fetch all user information from external sources."
            location = ParameterInfo.In.Query
        }
    }

    // ...
}

Endpoint Responses

Some endpoints may return different information depending on the response status - such as an error handler or authentication state. This can be specified using the responds() function.

get("/api/user/{username}") {
    docs {
        responds { // default response behavior (200 OK)
            desc = "If the user has been found."

            // this is a handy function to set the `example` property
            // if your response uses a JSON serializer
            exampleJson(UserInfo::class)
        }
        responds(HttpStatusCode.NotFound) {
            desc = "If the user doesn't exist."
            example = """{ "message": "Unable to locate the requested user." }"""
        }
    }

    // ...
}

Endpoints can reference URL links as supporting material, which are provided in a list on the documentation page.

get("/api/user/{username}") {
    docs {
        reference("https://example.com")
        reference("https://example.com", "Example Link")
    }

    // ...
}

Development

The project uses Gradle builds for... err... most things. ./gradlew :{module}:test and ./gradle :{module}:run are fairly universal.

License

Copyright (c) 2020 James Fenn

This Source Code Form is subject to the terms of the Mozilla Public
License, v. 2.0. If a copy of the MPL was not distributed with this
file, You can obtain one at https://mozilla.org/MPL/2.0/.