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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). Please see OpenAPITools/openapi-generator.

The OpenAPI Generator is a Java project. openapi-generator-cli will download the appropriate JAR file and invoke the java executable to run the OpenAPI Generator. You must have the java binary executable available on your PATH for this to work.

If you find this tool useful, please consider sponsoring this project financially via or directly to Kay Schecker (the author of this tool) 🙏

Version 2.x.x

[update] The command has been renamed

You need to execute openapi-generator-cli instead of openapi-generator from now on.

[added] semver support! 🎉

To make that happen, a version management was added to the package. The first time you run the command openapi-generator-cli the last stable version of OpenAPITools/openapi-generator is downloaded by default.

That version is saved in the file openapitools.json. Therefore you should include this file in your version control, to ensure that the correct version is being used next time you call the command.

If you would like to use a different version of the OpenAPITools/openapi-generator, you could change it by using one of the following commands:

  • openapi-generator-cli version-manager list
  • openapi-generator-cli version-manager set <versionTags...>

[added] generator config

You will now be able to configure the code generation in openapitools.json. This makes it more convenient to generate code for every file that matches the given glob expression. For more information, please check out the configuration documentation below.


Locally (recommended)

npm install @openapitools/openapi-generator-cli

or using yarn

yarn add @openapitools/openapi-generator-cli

After the installation has finished you can run npx openapi-generator-cli or add a script like this:

  "name": "my-cool-package",
  "version": "0.0.0",
  "scripts": {
    "my-awesome-script-name": "openapi-generator-cli generate -i docs/openapi.yaml -g typescript-angular -o generated-sources/openapi --additional-properties=ngVersion=6.1.7,npmName=restClient,supportsES6=true,npmVersion=6.9.0,withInterfaces=true",

Note the whitespace sensitivity when using multiple additional-properties:



npm install -g @openapitools/openapi-generator-cli

or using yarn

yarn global add @openapitools/openapi-generator-cli

After the installation has finished you can run openapi-generator-cli



openapi-generator-cli generate -g ruby -i -o /var/tmp/ruby-client


openapi-generator-cli generate -g ruby -i -o C:\temp\ruby-client


If you have installed the package locally and executed the command openapi-generator-cli at least once, you will find a new file called openapitools.json along with the package.json. Please add this file to your VCS.

Initially the file has the following content:

  "$schema": "node_modules/@openapitools/openapi-generator-cli/config.schema.json",
  "spaces": 2,
  "generator-cli": {
    "version": "4.3.1" // or the current latest version ;)

This configuration indicates the following:

  • the json file shall be formatted using 2 spaces
  • the jar files shall be downloaded to ./my/custom/storage/dir
  • the generator-cli version 4.3.1 is used

Further it is also possible to configure generators, for example:

  "$schema": "node_modules/@openapitools/openapi-generator-cli/config.schema.json",
  "spaces": 2,
  "generator-cli": {
    "version": "4.3.1",
    "storageDir": "~/my/custom/storage/dir", // optional
    "generators": { // optional
      "v2.0": { // any name you like (just printed to the console log or reference it using --generator-key) 
        "generatorName": "typescript-angular",
        "output": "#{cwd}/output/v2.0/#{ext}/#{name}",
        "glob": "examples/v2.0/{json,yaml}/*.{json,yaml}",
        "additionalProperties": {
          "ngVersion": "6.1.7",
          "npmName": "restClient",
          "supportsES6": "true",
          "npmVersion": "6.9.0",
          "withInterfaces": true
      "v3.0": { // any name you like (just printed to the console log or reference it using --generator-key) 
        "generatorName": "typescript-fetch",
        "output": "#{cwd}/output/v3.0/#{ext}/#{name}",
        "glob": "examples/v3.0/petstore.{json,yaml}"

If openapi-generator-cli generate is called without further arguments, then the configuration is automatically used to generate your code. 🎉

Available placeholders
placeholder description example
name just file name auth
Name just file name, but starting with a capital letter Auth
cwd the current cwd /Users/some-user/projects/some-project
base file name and extension auth.yaml
path full path and filename /Users/some-user/projects/some-project/docs/auth.yaml
dir path without the filename /Users/some-user/projects/some-project/docs
relDir directory name of file relative to the glob provided docs
relPath file name and extension of file relative to the glob provided docs/auth.yaml
ext just file extension yaml

Using custom / private maven registry

If you're using a private maven registry you can configure the downloadUrl and queryUrl like this:

  "$schema": "node_modules/@openapitools/openapi-generator-cli/config.schema.json",
  "spaces": 2,
  "generator-cli": {
    "version": "5.3.0",
    "repository": {
      "queryUrl": "https://private.maven.intern/solrsearch/select?q=g:${}+AND+a:${}&core=gav&start=0&rows=200",
      "downloadUrl": "https://private.maven.intern/maven2/${groupId}/${artifactId}/${versionName}/${artifactId}-${versionName}.jar"

If the version property param is set it is not necessary to configure the queryUrl.

Run specific generators

cmd v3.0 runs v2.0 runs
openapi-generator-cli generate --generator-key v3.0 yes no
openapi-generator-cli generate --generator-key v3.0 v2.0 yes yes
openapi-generator-cli generate --generator-key foo no no

Use Docker instead of running java locally

  "$schema": "node_modules/@openapitools/openapi-generator-cli/config.schema.json",
  "spaces": 2,
  "generator-cli": {
    "useDocker": true

If useDocker option is used, the spec file gets mounted to path /local/<your-spec-file-location> within container. So, if you would configure spec file as -i openapi/my-api.yml if running locally, with useDocker option set, you would have to configure it like this: -i /local/openapi/my-api.yml.

Custom Generators

Custom generators can be used by passing the --custom-generator=/my/custom-generator.jar argument.

Further Documentation

Please refer to the official openapi-generator docs for more information about the possible arguments and a detailed usage manual of the command line interface.

Install previous version

npm install @openapitools/openapi-generator-cli@previous
npm i @openapitools/openapi-generator-cli@1.0.18-4.3.1                                         

or using yarn

yarn add @openapitools/openapi-generator-cli@previous
yarn add @openapitools/openapi-generator-cli@1.0.18-4.3.1

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