openapi-url-resolver is a lightweight NPM package that provides a simple and efficient way to resolve server URLs from OpenAPI specifications. It also removes protocols from the resolved URLs and allows you to easily extract host information from OpenAPI definitions. This package is ideal for developers working with APIs that conform to the OpenAPI 3.x specification and need to extract server information to make API calls. Check out the blog post for more details—How to resolve server URLs containing variables in OpenAPI 3.x definitions?

Features:

• 🚀 Lightweight module with only 965 bytes in size
• 🎉 Zero dependencies, making it easy to install and use in your projects
• 🔍 Efficient and simple way to resolve server URLs from OpenAPI specifications

📦 Installation

You can install openapi-url-resolver via NPM:

npm install openapi-url-resolver

💻 Usage

To use openapi-url-resolver, you need to pass an OpenAPI 3.x specification object to the resolve() function. This function will return an array of resolved server URLs:

const openapiUrlResolver = require('openapi-url-resolver')

const spec = {
  openapi: '3.0.0',
  servers: [
    {
      url: 'https://{username}.gigantic-server.com:{port}/{basePath}',
      description: 'The production API server',
      variables: {
        username: {
          default: 'demo',
          description: 'this value is assigned by the service provider, in this example `gigantic-server.com`'
        },
        port: {
          enum: ['8443', '443'],
          default: '8443'
        },
        basePath: {
          default: 'v2'
        }
      }
    }
  ]
}

const hosts = openapiUrlResolver.resolve(spec)

/*

[
  'demo.gigantic-server.com:8443/v2',
  'demo.gigantic-server.com:443/v2'
]

*/
console.log(hosts)

Pass false as second parameter to get the server URLs with protocols.

const serverUrls = openapiUrlResolver.resolve(spec, false)

/*

[
  'https://demo.gigantic-server.com:8443/v2',
  'https://demo.gigantic-server.com:443/v2'
]

*/
console.log(serverUrls)

🧪 Testing

You can test using the below command or write your own tests using the OpenAPI specifications examples.

npm test

🚫 Limitations

The below are the known limitations, and they are not handled to keep it a lightweight and focused module to just extract the server information.

• It does not validate the OpenAPI definition. You can use openapi-schema-validator for validating the OpenAPI definition.
• It only works with JSON format.
  • Use yaml-to-json-schema to convert YAML to JSON.
  • Use postman-to-openapi to convert Postman collection to OpenAPI 3.x

🤝 Contributing

Contributions to openapi-url-resolver are most welcome!

If you find a bug or want to suggest a new feature, please open an issue on the GitHub repository. If you want to contribute code, please fork the repository, make your changes, and submit a pull request. Your contributions and feedback are most welcome!

📝 License

openapi-url-resolver is authored by @vinitshahdeo and released under the MIT License.

❤️ Support

If you find this package useful, please consider starring this repository on GitHub to show your appreciation. You can stay connected with me on Twitter—@vinit_shahdeo.

Thank you for your support! 🙏