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Master (5.0.0): 
If you find OpenAPI Generator useful for work, please consider asking your company to support this Open Source project by becoming a sponsor. You can also individually sponsor the project by becoming a backer.
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (both 2.0 and 3.0 are supported). Currently, the following languages/frameworks are supported:
| Languages/Frameworks | |
|---|---|
| API clients | ActionScript, Ada, Apex, Bash, C, C# (.net 2.0, 3.5 or later, .NET Standard 1.3 - 2.0, .NET Core 2.0), C++ (cpp-restsdk, Qt5, Tizen), Clojure, Dart (1.x, 2.x), Elixir, Elm, Eiffel, Erlang, Go, Groovy, Haskell (http-client, Servant), Java (Jersey1.x, Jersey2.x, OkHttp, Retrofit1.x, Retrofit2.x, Feign, RestTemplate, RESTEasy, Vertx, Google API Client Library for Java, Rest-assured, Spring 5 Web Client, MicroProfile Rest Client), k6, Kotlin, Lua, Nim, Node.js/JavaScript (ES5, ES6, AngularJS with Google Closure Compiler annotations, Flow types, Apollo GraphQL DataStore), Objective-C, OCaml, Perl, PHP, PowerShell, Python, R, Ruby, Rust (rust, rust-server), Scala (akka, http4s, scalaz, sttp, swagger-async-httpclient), Swift (2.x, 3.x, 4.x, 5.x), Typescript (AngularJS, Angular (2.x - 8.x), Aurelia, Axios, Fetch, Inversify, jQuery, Node, Rxjs) |
| Server stubs | Ada, C# (ASP.NET Core, NancyFx), C++ (Pistache, Restbed, Qt5 QHTTPEngine), Erlang, F# (Giraffe), Go (net/http, Gin), Haskell (Servant), Java (MSF4J, Spring, Undertow, JAX-RS: CDI, CXF, Inflector, Jersey, RestEasy, Play Framework, PKMST, Vert.x), Kotlin (Spring Boot, Ktor, Vertx), PHP (Laravel, Lumen, Slim, Silex, Symfony, Zend Expressive), Python (Flask), NodeJS, Ruby (Sinatra, Rails5), Rust (rust-server), Scala (Akka, Finch, Lagom, Play, Scalatra) |
| API documentation generators | HTML, Confluence Wiki, Asciidoc |
| Configuration files | Apache2 |
| Others | GraphQL, JMeter, MySQL Schema, Protocol Buffer |
The OpenAPI Specification has undergone 3 revisions since initial creation in 2010. The openapi-generator project has the following compatibilities with the OpenAPI Specification:
| OpenAPI Generator Version | Release Date | Notes |
|---|---|---|
| 5.0.0 (upcoming major release) SNAPSHOT | 25.06.2020 | Major release with breaking changes (no fallback) |
| 4.3.1 (latest stable release) | 06.05.2020 | Patch release (enhancements, bug fixes, etc) |
OpenAPI Spec compatibility: 1.0, 1.1, 1.2, 2.0, 3.0
For old releases, please refer to the Release page.
You can find our released artifacts on maven central:
Core:
<dependency>
<groupId>org.openapitools</groupId>
<artifactId>openapi-generator</artifactId>
<version>${openapi-generator-version}</version>
</dependency>
See the different versions of the openapi-generator artifact available on maven central.
Cli:
<dependency>
<groupId>org.openapitools</groupId>
<artifactId>openapi-generator-cli</artifactId>
<version>${openapi-generator-version}</version>
</dependency>
See the different versions of the openapi-generator-cli artifact available on maven central.
Maven plugin:
<dependency>
<groupId>org.openapitools</groupId>
<artifactId>openapi-generator-maven-plugin</artifactId>
<version>${openapi-generator-version}</version>
</dependency>
Gradle plugin:
<dependency>
<groupId>org.openapitools</groupId>
<artifactId>openapi-generator-gradle-plugin</artifactId>
<version>${openapi-generator-version}</version>
</dependency>
If you're looking for the latest stable version, you can grab it directly from Maven.org (Java 8 runtime at a minimum):
JAR location: https://repo1.maven.org/maven2/org/openapitools/openapi-generator-cli/4.3.1/openapi-generator-cli-4.3.1.jar
For Mac/Linux users:
wget https://repo1.maven.org/maven2/org/openapitools/openapi-generator-cli/4.3.1/openapi-generator-cli-4.3.1.jar -O openapi-generator-cli.jar
For Windows users, you will need to install wget or you can use Invoke-WebRequest in PowerShell (3.0+), e.g.
Invoke-WebRequest -OutFile openapi-generator-cli.jar https://repo1.maven.org/maven2/org/openapitools/openapi-generator-cli/4.3.1/openapi-generator-cli-4.3.1.jar
After downloading the JAR, run java -jar openapi-generator-cli.jar help to show the usage.
For Mac users, please make sure Java 8 is installed (Tips: run java -version to check the version), and export JAVA_HOME in order to use the supported Java version:
export JAVA_HOME=`/usr/libexec/java_home -v 1.8`
export PATH=${JAVA_HOME}/bin:$PATH
One downside to manual jar downloads is that you don't keep up-to-date with the latest released version. We have a Bash launcher script at bin/utils/openapi-generator.cli.sh which resolves this issue.
To install the launcher script, copy the contents of the script to a location on your path and make the script executable.
An example of setting this up (NOTE: Always evaluate scripts curled from external systems before executing them).
mkdir -p ~/bin/openapitools
curl https://raw.githubusercontent.com/OpenAPITools/openapi-generator/master/bin/utils/openapi-generator-cli.sh > ~/bin/openapitools/openapi-generator-cli
chmod u+x ~/bin/openapitools/openapi-generator-cli
export PATH=$PATH:~/bin/openapitools/
Now, openapi-generator-cli is "installed". On invocation, it will query the GitHub repository for the most recently released version. If this matches the last downloaded jar,
it will execute as normal. If a newer version is found, the script will download the latest release and execute it.
If you need to invoke an older version of the generator, you can define the variable OPENAPI_GENERATOR_VERSION either ad hoc or globally. You can export this variable if you'd like to persist a specific release version.
Examples:
# Execute latest released openapi-generator-cli
openapi-generator-cli version
# Execute version 3.1.0 for the current invocation, regardless of the latest released version
OPENAPI_GENERATOR_VERSION=3.1.0 openapi-generator-cli version
# Execute version 3.1.0-SNAPSHOT for the current invocation
OPENAPI_GENERATOR_VERSION=3.1.0-SNAPSHOT openapi-generator-cli version
# Execute version 3.0.2 for every invocation in the current shell session
export OPENAPI_GENERATOR_VERSION=3.0.2
openapi-generator-cli version # is 3.0.2
openapi-generator-cli version # is also 3.0.2
# To "install" a specific version, set the variable in .bashrc/.bash_profile
echo "export OPENAPI_GENERATOR_VERSION=3.0.2" >> ~/.bashrc
source ~/.bashrc
openapi-generator-cli version # is always 3.0.2, unless any of the above overrides are done ad hoc
To build from source, you need the following installed and available in your $PATH:
After cloning the project, you can build it from source with this command:
mvn clean install
If you don't have maven installed, you may directly use the included maven wrapper, and build with the command:
./mvnw clean install
The default build contains minimal static analysis (via CheckStyle). To run your build with PMD and Spotbugs, use the static-analysis profile:
mvn -Pstatic-analysis clean install
To install, run brew install openapi-generator
Here is an example usage to generate a Ruby client:
openapi-generator generate -i https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml -g ruby -o /tmp/test/
To reinstall with the latest master, run brew uninstall openapi-generator && brew install --HEAD openapi-generator
To install OpenJDK (pre-requisites), please run
brew tap AdoptOpenJDK/openjdk
brew cask install adoptopenjdk12
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-12.0.2.jdk/Contents/Home/
To install Maven, please run
brew install maven
The OpenAPI Generator image acts as a standalone executable. It can be used as an alternative to installing via homebrew, or for developers who are unable to install Java or upgrade the installed version.
To generate code with this image, you'll need to mount a local location as a volume.
Example:
docker run --rm -v "${PWD}:/local" openapitools/openapi-generator-cli generate \
-i https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml \
-g go \
-o /local/out/go
The generated code will be located under ./out/go in the current directory.
The openapi-generator-online image can act as a self-hosted web application and API for generating code. This container can be incorporated into a CI pipeline, and requires at least two HTTP requests and some docker orchestration to access generated code.
Example usage:
# Start container at port 8888 and save the container id
> CID=$(docker run -d -p 8888:8080 openapitools/openapi-generator-online)
# allow for startup
> sleep 10
# Get the IP of the running container (optional)
GEN_IP=$(docker inspect --format '{{.NetworkSettings.IPAddress}}' $CID)
# Execute an HTTP request to generate a Ruby client
> curl -X POST --header 'Content-Type: application/json' --header 'Accept: application/json' \
-d '{"openAPIUrl": "https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml"}' \
'http://localhost:8888/api/gen/clients/ruby'
{"code":"c2d483.3.4672-40e9-91df-b9ffd18d22b8","link":"http://localhost:8888/api/gen/download/c2d483.3.4672-40e9-91df-b9ffd18d22b8"}
# Download the generated zip file
> wget http://localhost:8888/api/gen/download/c2d483.3.4672-40e9-91df-b9ffd18d22b8
# Unzip the file
> unzip c2d483.3.4672-40e9-91df-b9ffd18d22b8
# Shutdown the openapi generator image
> docker stop $CID && docker rm $CID
You can use run-in-docker.sh to do all development. This script maps your local repository to /gen
in the docker container. It also maps ~/.m2/repository to the appropriate container location.
To execute mvn package:
git clone https://github.com/openapitools/openapi-generator
cd openapi-generator
./run-in-docker.sh mvn package
Build artifacts are now accessible in your working directory.
Once built, run-in-docker.sh will act as an executable for openapi-generator-cli. To generate code, you'll need to output to a directory under /gen (e.g. /gen/out). For example:
./run-in-docker.sh help # Executes 'help' command for openapi-generator-cli
./run-in-docker.sh list # Executes 'list' command for openapi-generator-cli
./run-in-docker.sh /gen/bin/go-petstore.sh # Builds the Go client
./run-in-docker.sh generate -i modules/openapi-generator/src/test/resources/2_0/petstore.yaml \
-g go -o /gen/out/go-petstore -DpackageName=petstore # generates go client, outputs locally to ./out/go-petstore
If an error like this occurs, just execute the mvn clean install -U command:
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.19.1:test (default-test) on project openapi-generator: A type incompatibility occurred while executing org.apache.maven.plugins:maven-surefire-plugin:2.19.1:test: java.lang.ExceptionInInitializerError cannot be cast to java.io.IOException
./run-in-docker.sh mvn clean install -U
Failed to execute goal org.fortasoft:gradle-maven-plugin:1.0.8:invoke (default) on project openapi-generator-gradle-plugin-mvn-wrapper: org.gradle.tooling.BuildException: Could not execute build using Gradle distribution 'https://services.gradle.org/distributions/gradle-4.7-bin.zip'
Right now: no solution for this one
Prerequisite: install Vagrant and VirtualBox.
git clone https://github.com/openapitools/openapi-generator.git
cd openapi-generator
vagrant up
vagrant ssh
cd /vagrant
./run-in-docker.sh mvn package
There is also an NPM package wrapper available for different platforms (e.g. Linux, Mac, Windows). (JVM is still required) Please see the project's README there for more information.
Install it globally to get the CLI available on the command line:
npm install @openapitools/openapi-generator-cli -g
openapi-generator version
Or install a particular OpenAPI Generator version (e.g. v4.3.1):
npm install @openapitools/openapi-generator-cli@cli-4.3.1 -g
Or install it as dev-dependency:
npm install @openapitools/openapi-generator-cli -D
To generate a PHP client for petstore.yaml, please run the following
git clone https://github.com/openapitools/openapi-generator
cd openapi-generator
mvn clean package
java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate \
-i https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml \
-g php \
-o /var/tmp/php_api_client
(if you're on Windows, replace the last command with java -jar modules\openapi-generator-cli\target\openapi-generator-cli.jar generate -i https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml -g php -o c:\temp\php_api_client)
You can also download the JAR (latest release) directly from maven.org
To get a list of general options available, please run java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar help generate
To get a list of PHP specified options (which can be passed to the generator with a config file via the -c option), please run java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar config-help -g php
You can build a client against the Petstore API as follows:
./bin/java-petstore-okhttp-gson.sh
(On Windows, run .\bin\windows\java-petstore-okhttp-gson.bat instead)
This script uses the default library, which is okhttp-gson. It will run the generator with this command:
java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate \
-i https://raw.githubusercontent.com/openapitools/openapi-generator/master/modules/openapi-generator/src/test/resources/2_0/petstore.yaml \
-g java \
-o samples/client/petstore/java/okhttp-gson
with a number of options. The java options are documented here.
You can also get the options with the help generate command (below only shows partial results):
NAME
openapi-generator-cli generate - Generate code with the specified
generator.
SYNOPSIS
openapi-generator-cli generate
[(-a <authorization> | --auth <authorization>)]
[--api-name-suffix <api name suffix>]
[--api-package <api package>] [--artifact-id <artifact id>]
[--artifact-version <artifact version>]
[(-c <configuration file> | --config <configuration file>)]
[-D <system properties>...]
[(-e <templating engine> | --engine <templating engine>)]
[--enable-post-process-file]
[(-g <generator name> | --generator-name <generator name>)]
[--generate-alias-as-model] [--git-repo-id <git repo id>]
[--git-user-id <git user id>] [--group-id <group id>]
[--http-user-agent <http user agent>]
(-i <spec file> | --input-spec <spec file>)
[--ignore-file-override <ignore file override location>]
[--import-mappings <import mappings>...]
[--instantiation-types <instantiation types>...]
[--invoker-package <invoker package>]
[--language-specific-primitives <language specific primitives>...]
[--library <library>] [--log-to-stderr] [--minimal-update]
[--model-name-prefix <model name prefix>]
[--model-name-suffix <model name suffix>]
[--model-package <model package>]
[(-o <output directory> | --output <output directory>)]
[(-p <additional properties> | --additional-properties <additional properties>)...]
[--package-name <package name>] [--release-note <release note>]
[--remove-operation-id-prefix]
[--reserved-words-mappings <reserved word mappings>...]
[(-s | --skip-overwrite)] [--server-variables <server variables>...]
[--skip-validate-spec] [--strict-spec <true/false strict behavior>]
[(-t <template directory> | --template-dir <template directory>)]
[--type-mappings <type mappings>...] [(-v | --verbose)]
OPTIONS
-a <authorization>, --auth <authorization>
adds authorization headers when fetching the OpenAPI definitions
remotely. Pass in a URL-encoded string of name:header with a comma
separating multiple values
...... (results omitted)
-v, --verbose
verbose mode
You can then compile and run the client, as well as unit tests against it:
cd samples/client/petstore/java/okhttp-gson
mvn package
Other languages have petstore samples, too:
./bin/android-petstore-all.sh
./bin/java-petstore-all.sh
./bin/objc-petstore.sh
... and others. Here is a list of all scripts.
Please refer to customization.md on how to customize the output (e.g. package name, version)
Please refer to integration.md on how to integrate OpenAPI generator with Maven, Gradle, sbt, Bazel, Github and CI/CD.
Here are the public online services:
The server is sponsored by Linode
(These services are beta and do not have any guarantee on service level)
Please refer to online.md on how to run and use the openapi-generator-online - a web service for openapi-generator.
The OpenAPI Generator project is intended as a benefit for users of the Open API Specification. The project itself has the License as specified. In addition, please understand the following points:
When code is generated from this project, it shall be considered AS IS and owned by the user of the software. There are no warranties--expressed or implied--for generated code. You can do what you wish with it, and once generated, the code is your responsibility and subject to the licensing terms that you deem appropriate.
Here is a list of community-conitributed IDE plug-ins that integrate with OpenAPI Generator:
Here are some companies/projects (alphabetical order) using OpenAPI Generator in production. To add your company/project to the list, please visit README.md and click on the icon to edit the page.
OpenAPI Generator core team members are contributors who have been making significant contributions (review issues, fix bugs, make enhancements, etc) to the project on a regular basis.
NOTE: Embedded templates are only supported in Mustache format. Support for all other formats is experimental and subject to change at any time.
Here is a list of template creators:
Here are the requirements to become a core team member:
To join the core team, please reach out to team@openapitools.org for more information.
To become a Template Creator, simply submit a PR for new API client (e.g. Rust, Elixir) or server stub (e.g. Ruby Grape) generator.
Members of the OpenAPI Generator technical committee shoulder the following responsibilities:
Who is eligible? Those who want to join must have at least 3 PRs merged into a generator. (Exceptions can be granted to template creators or contributors who have made a lot of code changes with less than 3 merged PRs)
If you want to join the committee, please kindly apply by sending an email to team@openapitools.org with your Github ID.
OpenAPI Generator is a fork of Swagger Codegen. In view of the issues with the Swagger Codegen 3.0.0 (beta) release and the disagreement on the project's direction, more than 40 top contributors and template creators of Swagger Codegen decided to fork Swagger Codegen and maintain a community-driven version called "OpenAPI Generator". Please refer to the Q&A for more information.
Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
Copyright 2018 SmartBear Software
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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