openapi-to-plantuml

Java library to generate a PlantUML Class Diagram (supplemented with path information) from an OpenAPI 3.0 definition (YAML or JSON). Try it online here.

Features

Supports all features of OpenAPI 3.0 including

Mixed types (oneOf, anyOf, allOf)
Multiple levels of indirection ($ref -> $ref for example)
Multiple response content types

Status: Released to Maven Central

Limitations

Only handles internal references ("#/*"), that is the yaml file should be self-contained. As of 0.1.9 external refs are displayed but not exploded. Full external reference support is being considered.

TODO

Model Callbacks
Model additionalProperties

openapi-example.yml:

How to build

mvn clean install

How to quickly convert your OpenAPI definition

The easiest thing to do is to use the online converter. If your definition is large then PlantText may refuse to render it (the Plant UML text is encoded and added to the PlantText url which can get too long). In that case just add your yaml file to src/test/resources/demo/ directory and run mvn test. The generated image will be saved in target/demos.

Getting started

Add this dependency to your pom.xml:

<dependency>
  <groupId>com.github.davidmoten</groupId>
  <artifactId>openapi-to-plantuml</artifactId>
  <version>VERSION_HERE</version>
</dependency>

Or use the standalone jar-with-dependencies artifact from Maven Central (or from the target directory if you have built the project locally):

java -jar openapi-to-plantuml-VERSION_HERE-jar-with-dependencies.jar openapi.yaml PNG openapi.png

Usage

import com.github.davidmoten.oas3.puml.Converter;

String puml = Converter.openApiToPuml(openapi);

Examples

Unit test examples are here.

petstore-expanded.yml: