Auto generate a client sdk from your openapi 3.0.0-3.1.0 document using Openapi JSON Schema Generator. This project is a code generator that focuses on supporting all openapi and json schema features.
OpenAPI JSON Schema Generator allows auto-generation of API client libraries (SDK generation) given an OpenAPI document (3.0.0-3.1.0* are supported). This project focuses on making the output 100% compliant with openapi + JSON schema specs. The goal is to fully support everything defined in openapi + the included JSON schema specs so developers can use all of those features.
Currently, the following languages/frameworks are supported:
| Feature | Python | Java | Kotlin |
|---|---|---|---|
| Generator status | stable | stable | stable |
| Openapi v3.0.0-3.1.0 ingestion | X | X | X |
| Json Schema 2020-12 Support (components/schemas) | X | X | X |
| Component schema classes + documentation produced | X | X | X |
| Documentation produced for other component types: headers, parameters, requestBodies, ressponses, securitySchemes |
X | X | |
| Methods generated for endpoints that send/receive json + docs generated for them |
X | X |
- Openapi spec support for v3.0.0-3.1.0
- thorough tests run in CI using json schema test suite, see 3_0_0 and 3_1_0 sample clients
- Static analysis:
- Python: mypy run in CI against python petstore sample
- Java: checker framework run w/ NullnessChecker, ensures no null pointer exceptions
- Format support for: int32, int64, float, double, binary, date, datetime, uuid
- Invalid (in language) property names supported like
from,1var,hi-thereetc in- schema property names
- endpoint parameter names
- Openapi document inline schemas supported at any depth in any location
- Generated Code: Class + method inputs are typed
- Generated Code: Static type checking done in static languages using builder inputs and class property access
- Generated Code: run-time type checking done in all generators (a payload can be validated against n schemas)
- Generated Code re-use built in from the ground up
- components/schemas/headers etc are generated as separate classes and imported when used via $ref
- Payload values are not coerced when validated, so a date/date-time value can pass other validations that describe the payload only as type string
- String transmission of numbers supported with type: string, format: number, value can be accessed as a Decimal with schemas.as_decimal(inst)
- Multiple content types supported for request and response bodies
- Endpoint response always also includes the raw response
- Interfaces kept consistent across generated languages
We use a Discord server as a place to ask questions and help each other. It offers functionality very similar to Slack. You can join us here: https://discord.gg/mHB8WEQuYQ
Yes; contributions are welcome! Submit a PR if you want to add a new server scaffold, client sdk, or documentation generator in any language.
- OpenAPI JSON Schema Generator
- Overview
- Table of Contents
- Installation
- Getting Started
- Usage
- Companies/Projects using OpenAPI JSON Schema Generator
- About Us
- License
The OpenAPI Specification has undergone 3 revisions since initial creation in 2010. The openapi-json-schema-generator project has the following compatibilities with the OpenAPI Specification:
| OpenAPI JSON Schema Generator Version | OpenAPI Spec compatibility |
|---|---|
| 3.3.0+ | 3.0.0 - 3.1.0* |
| 3.1.0 - 3.2.1 | 3.0.0 - 3.1.0 |
| 1.0.0 - 3.0.0 | 3.0.0 - 3.0.3 |
OpenAPI v3.1.0 specification support includes these new/updated 2020-12 json schema keywords:
- const: only string values are working because of bugs in swagger parser
- contains
- dependentRequired
- dependentSchemas
- else
- if
- maxContains
- minContains
- patternProperties
- prefixItems
- propertyNames
- then
- type (array of types supported in addition to one non-array value)
- unevaluatedItems
- unevaluatedProperties
Note: these features can also be seen in the generator documentation schema features
To build from source, you need the following installed and available in your $PATH:
After cloning the project, you can build it from source with this command:
mvn clean installThe default build contains minimal static analysis (via CheckStyle). To run your build with PMD and Spotbugs, use the static-analysis profile:
mvn -Pstatic-analysis clean installThe docker image acts as a standalone executable. It can be used as an alternative to installing via homebrew, or for developers who are unable to install Java or upgrade the installed version.
To generate code with this image, you'll need to mount a local location as a volume.
Example:
docker run --rm -v "${PWD}:/local" openapijsonschematools/openapi-json-schema-generator-cli generate \
-i https://raw.githubusercontent.com/openapi-json-schema-tools/openapi-json-schema-generator/master/src/test/resources/3_0/petstore.yaml \
-g python \
-o /local/out/pythonThe generated code will be located under ./out/python in the current directory.
You can use bin/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/openapi-json-schema-tools/openapi-json-schema-generator
cd openapi-json-schema-generator
./bin/run-in-docker.sh mvn packageBuild artifacts are now accessible in your working directory.
Once built, run-in-docker.sh will act as an executable for openapi-json-schema-generator-cli. To generate code, you'll need to output to a directory under /gen (e.g. /gen/out). For example:
./bin/run-in-docker.sh help # Executes 'help' command for openapi-json-schema-generator-cli
./bin/run-in-docker.sh list # Executes 'list' command for openapi-json-schema-generator-cli
./bin/run-in-docker.sh /gen/bin/python-petstore.sh # Builds the Python client
./bin/run-in-docker.sh generate -i src/test/resources/3_0/petstore.yaml \
-g go -o /gen/out/python-petstore -p packageName=petstore_api # generates python client, outputs locally to ./out/python-petstoreIf 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-json-schema-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 -UFailed to execute goal org.fortasoft:gradle-maven-plugin:1.0.8:invoke (default) on project openapi-json-schema-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 :|
To generate a python client for petstore.yaml, please run the following
git clone https://github.com/openapi-json-schema-tools/openapi-json-schema-generator
cd openapi-json-schema-generator
mvn clean package
java -jar target/openapi-json-schema-generator-cli.jar generate \
-i https://raw.githubusercontent.com/openapi-json-schema-tools/openapi-json-schema-generator/master/src/test/resources/3_0/petstore.yaml \
-g python \
-o /var/tmp/python_api_client(if you're on Windows, replace the last command with java -jar target\openapi-json-schema-generator-cli.jar generate -i https://raw.githubusercontent.com/openapi-json-schema-tools/openapi-json-schema-generator/master/src/test/resources/3_0/petstore.yaml -g python -o c:\temp\python_api_client)
To get a list of general options available, please run java -jar target/openapi-json-schema-generator-cli.jar help generate
To get a list of python specified options (which can be passed to the generator with a config file via the -c option), please run java -jar target/openapi-json-schema-generator-cli.jar config-help -g python
You can build a client against the Petstore API as follows:
./bin/generate-samples.sh ./bin/generate_samples_configs/python.yaml(On Windows, please install GIT Bash for Windows to run the command above)
This script will run the generator with this command:
java -jar target/openapi-json-schema-generator-cli.jar generate \
-i https://raw.githubusercontent.com/openapijsonschematools/openapi-json-schema-generator/master/src/test/resources/3_0/petstore.yaml \
-g python \
-t src/main/resources/python \
--additional-properties packageName=petstore_api \
-o samples/client/petstore/pythonwith a number of options. The python options are documented here.
You can also get the options with the help generate command (below only shows partial results):
NAME
openapi-json-schema-generator-cli generate - Generate code with the specified
generator.
SYNOPSIS
openapi-json-schema-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>)] [--dry-run]
[(-e <templating engine> | --engine <templating engine>)]
[--enable-post-process-file]
[(-g <generator name> | --generator-name <generator name>)]
[--git-host <git host>] [--git-repo-id <git repo id>]
[--git-user-id <git user id>] [--global-property <global properties>...]
[--group-id <group id>] [--hide-generation-timestamp]
[--http-user-agent <http user agent>]
[(-i <spec file> | --input-spec <spec file>)]
[--ignore-file-override <ignore file override location>]
[--ints-allowed-for-float-double-formats]
[--invoker-package <invoker package>] [--minimal-update]
[--model-name-prefix <model name prefix>]
[--model-name-suffix <model name suffix>]
[(-o <output directory> | --output <output directory>)] [(-p <additional properties> | --additional-properties <additional properties>)...]
[--package-name <package name>] [--release-note <release note>]
[--remove-enum-value-prefix] [--remove-operation-id-prefix]
[(-s | --skip-overwrite)] [--skip-operation-example]
[--skip-validate-spec] [--strict-spec <true/false strict behavior>]
[(-t <template directory> | --template-dir <template directory>)]
[(-v | --verbose)]
generate OPTIONS
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
--api-name-suffix <api name suffix>
Suffix that will be appended to all API names ('tags'). Default:
Api. e.g. Pet => PetApi. Note: Only ruby, python, jaxrs generators
support this feature at the moment.
--api-package <api package>
package for generated api classes
--artifact-id <artifact id>
artifactId in generated pom.xml. This also becomes part of the
generated library's filename
--artifact-version <artifact version>
artifact version in generated pom.xml. This also becomes part of the
generated library's filename
-c <configuration file>, --config <configuration file>
Path to configuration file. It can be JSON or YAML. If file is JSON,
the content should have the format {"optionKey":"optionValue",
"optionKey1":"optionValue1"...}. If file is YAML, the content should
have the format optionKey: optionValue. Supported options can be
different for each language. Run config-help -g {generator name}
command for language-specific config options.
--dry-run
Try things out and report on potential changes (without actually
making changes).
-e <templating engine>, --engine <templating engine>
templating engine: "handlebars"(default) or "mustache"
--enable-post-process-file
Enable post-processing file using environment variables.
-g <generator name>, --generator-name <generator name>
generator to use (see list command for list)
--git-host <git host>
Git host, e.g. gitlab.com.
--git-repo-id <git repo id>
Git repo ID, e.g. openapi-generator.
--git-user-id <git user id>
Git user ID, e.g. openapijsonschematools.
--global-property <global properties>
sets specified global properties (previously called 'system
properties') in the format of name=value,name=value (or multiple
options, each with name=value)
--group-id <group id>
groupId in generated pom.xml
--hide-generation-timestamp
Hides the generation timestamp when files are generated.
--http-user-agent <http user agent>
HTTP user agent, e.g. codegen_csharp_api_client, default to
'OpenAPI-Generator/{packageVersion}/{language}'
-i <spec file>, --input-spec <spec file>
location of the OpenAPI spec, as URL or file (required if not loaded
via config using -c)
--ignore-file-override <ignore file override location>
Specifies an override location for the .openapi-generator-ignore
file. Most useful on initial generation.
--ints-allowed-for-float-double-formats
Integers are allowed in for type: number format:float/double
payloads
--invoker-package <invoker package>
root package for generated code
--minimal-update
Only write output files that have changed.
--model-name-prefix <model name prefix>
Prefix that will be prepended to all model names.
--model-name-suffix <model name suffix>
Suffix that will be appended to all model names.
-o <output directory>, --output <output directory>
where to write the generated files (current dir by default)
-p <additional properties>, --additional-properties <additional
properties>
sets additional properties that can be referenced by the mustache
templates in the format of name=value,name=value. You can also have
multiple occurrences of this option.
--package-name <package name>
package for generated classes (where supported)
--release-note <release note>
Release note, default to 'Minor update'.
--remove-enum-value-prefix
Remove the common prefix of enum values
--remove-operation-id-prefix
Remove prefix of operationId, e.g. config_getId => getId
-s, --skip-overwrite
specifies if the existing files should be overwritten during the
generation.
--skip-operation-example
Skip examples defined in operations to avoid out of memory errors.
--skip-validate-spec
Skips the default behavior of validating an input specification.
--strict-spec <true/false strict behavior>
'MUST' and 'SHALL' wording in OpenAPI spec is strictly adhered to.
e.g. when false, no fixes will be applied to documents which pass
validation but don't follow the spec.
-t <template directory>, --template-dir <template directory>
folder containing the template files
-v, --verbose
verbose mode
You can then use the auto-generated client. The README.md is a good starting point.
Other generators have samples too.
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, Github and CI/CD.
The OpenAPI JSON Schema 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:
- The templates included with this project are subject to the License.
- Generated code is intentionally not subject to the parent project license
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.
This repo is based on v6.2.0 of OpenAPI Generator. This project focuses on making the output 100% compliant with JSON schema as part of the OpenAPI 3.1 specification with a focus on complex cases (top-down approach). The goal is to fully support everything defined in JSON schema so that developers can leverage JSON schema as well as OpenAPI specification in their API design. Building here allows for more rapid progress supporting new features in OpenAPI 3.X without having to support many older generators which don't use the new features.
OpenAPI JSON Schema Generator is based on OpenAPI Generator v6.2.0. The project was created here because the openapi-generator core team required the removal of the python generator from their project. The author of the python generator (@spacether) preferred to keep building in the openapi-generator repo, but core team refused to consider keeping python in openapi-generator. Below is a timeline of those events and some of their reasons:
- Jan 4, 2021 - openapi-generator v5.4.0: python-experimental created. This generator is the beginning of the current python generator in this repo.
- Sept 19, 2022 - meeting to discuss openapi 3.1.0 + python client, removal of python client mentioned as an option, not a requirement
- Sept 22, 2022 - openapi-generator v6.2.0: new python-experimental switched in as the primary python client
- Sept 23, 2022 - communication clarified that removal of the python generator is required
- Sept 24, 2022 - openapi-generator v6.2.0: removal of python generator mentioned in v6.2.0 release
- Sept 26, 2022 - different new repo made for openapi json schema generator in OpenapiTools org
- Oct 2, 2022 - moved project to this repo I moved the generator to the new repo because full ownership privledges were not granted on the new repo to me, which had been promised, and because I was not given privledges that allowed docker distribution from the new repo
- May 14, 2023 - openapi-generator v7.0.0: python generator removed, a diffferent generator becomes the only python client
- Core team and @wing328 felt adoption of the python client was reduced from 5.0.0 and onward due to python-prior + python generators
- Some python users in the community did not prefer the new python code
- The fact that other users + companies are using it does not warrant keeping it in the repo
- The fact that it is more fully passing json schema tests (including the feature keywords oneOf/anyOf/allOf/additionalProperties) does not warrant keeping it in the repo
- The openapi-generator core team refused to consider the option of keeping the python generator as another generator option in their repo, and building another python generator that looks more conventional and making that generator primary
Copyright 2023 OpenAPI-Json-Schema-Generator Contributors 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.