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Showing content from https://simply-how.com/design-and-generate-api-code-from-openapi below:

OpenAPI 3.0 Editor And Generator With A Spring Boot Example

OpenAPI Generator is a tool that can generate API clients and server stubs using as an input an OpenAPI or Swagger specification file. It's a fork of the swagger-codegen generator that can be launched using a CLI with npm, docker and Homebrew.

The full list of supported Languages/Frameworks is available in the following link: https://openapi-generator.tech/docs/generators

Maven and Gradle plugins are also available to automate the code generation in your existing projects.

1. Node.js and npm are required to generate your API from the command line using npm. You can download them from the following link: https://nodejs.org/en/download/
2. Install the latest version of the tool globally so that it can be exposed on the command line using npm:

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

To generate your REST API server or client from an OpenAPI file, run the following command:

openapi-generator generate -i <openapi-file> -g <generator-id> -o <output-path>

with the parameters being:

• <openapi-file>: the OpenAPI file path
• <generator-id>: the name of the language / framework (as listed here, can also be listed using openapi-generator list)
• <output-path>: the path where the project will be generated

openapi-generator generate -i my-api.yaml -g spring -o C:\tmp\my-api

You can customize the generated project package name and other aspects using command line flags that can be listed with the command openapi-generator help generate.

With the -c <configuration file> flag, you can specify the path of a file containing configuration properties specific to the chosen language / framework. This file can be either json or yaml formatted. The supported properties for each language can be listed with openapi-generator config-help -g <generator-id> or can be viewed by selecting the appropriate entry in https://openapi-generator.tech/docs/generators.

config.json:

{
  "basePackage": "com.myorg.myapp",
  "configPackage": "com.myorg.myapp.config",
  "apiPackage": "com.myorg.myapp.controllers",
  "modelPackage": "com.myorg.myapp.domain",
  "groupId": "com.myorg",
  "artifactId": "my-app",
  "artifactVersion": "0.1.0"
}

openapi-generator generate -i my-api.yaml -g spring -c config.json -o C:\tmp\my-api

The configuration properties can also be specified from the command line using the flag: --additional-properties=key1=value1,key2=value2

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