Pros of swagger-codegen

• Supports multiple programming languages and frameworks
• Extensive community support and regular updates
• Offers a wide range of customization options

Cons of swagger-codegen

• Can be complex to set up and configure
• Generated code may require additional refinement
• Larger codebase and potentially slower generation process

Code comparison

swagger-codegen (Java):

public class PetApi {
    private final ApiClient apiClient;

    public PetApi() {
        this(Configuration.getDefaultApiClient());
    }

    public PetApi(ApiClient apiClient) {
        this.apiClient = apiClient;
    }
}

swagger-typescript-api (TypeScript):

export class PetApi extends HttpClient {
  constructor(config?: Partial<ApiConfig>) {
    super(config);
  }

  getPetById = (petId: number): Promise<Pet> => {
    return this.request({ url: `/pet/${petId}`, method: "GET" });
  };
}

swagger-codegen offers a more traditional object-oriented approach with separate classes for API client and endpoints, while swagger-typescript-api provides a more concise, TypeScript-friendly structure with inline method definitions.

swagger-codegen is better suited for projects requiring multi-language support and extensive customization, whereas swagger-typescript-api excels in TypeScript-specific environments with its simpler setup and more idiomatic output.

Pros of openapi-generator

• Supports a wide range of programming languages and frameworks
• Offers more customization options and templates
• Has a larger community and more frequent updates

Cons of openapi-generator

• Can be more complex to set up and use
• May generate more boilerplate code
• Slower generation process for large API specifications

Code Comparison

swagger-typescript-api:

import { Api } from './api';

const api = new Api({
  baseUrl: 'https://api.example.com',
});

const response = await api.users.getUser({ userId: 123 });

openapi-generator:

import { DefaultApi, Configuration } from './api';

const config = new Configuration({
  basePath: 'https://api.example.com',
});
const api = new DefaultApi(config);

const response = await api.getUserById(123);

Summary

openapi-generator is a more versatile tool supporting multiple languages and offering extensive customization options. It has a larger community and more frequent updates. However, it can be more complex to set up and may generate more boilerplate code. swagger-typescript-api is more focused on TypeScript and generally easier to use, but with fewer features and language support. The choice between the two depends on project requirements, target language, and desired level of customization.

Pros of NSwag

• Supports multiple programming languages and frameworks, not limited to TypeScript
• Offers more comprehensive tooling, including code generation for clients and servers
• Provides a user interface for API exploration and testing

Cons of NSwag

• Can be more complex to set up and configure due to its broader feature set
• May generate more verbose code compared to swagger-typescript-api
• Steeper learning curve for developers new to the tool

Code Comparison

NSwag (C# client generation):

var document = await OpenApiDocument.FromUrlAsync("https://api.example.com/swagger/v1/swagger.json");
var settings = new CSharpClientGeneratorSettings { ... };
var generator = new CSharpClientGenerator(document, settings);
var code = generator.GenerateFile();

swagger-typescript-api (TypeScript client generation):

import { generateApi } from 'swagger-typescript-api';

const { files } = await generateApi({
  input: './swagger.json',
  output: './src/api',
});

Both tools generate API clients from OpenAPI/Swagger specifications, but NSwag offers more language options and additional features, while swagger-typescript-api focuses on TypeScript and provides a simpler, more streamlined approach for TypeScript projects.

Pros of openapi-typescript-codegen

• Supports a wider range of OpenAPI versions (2.0, 3.0, and 3.1)
• Generates more comprehensive client code, including models, services, and core functionality
• Offers better TypeScript type inference and stricter typing

Cons of openapi-typescript-codegen

• Less flexible configuration options compared to swagger-typescript-api
• May generate more verbose code, which could lead to larger bundle sizes
• Lacks some advanced features like runtime data validation

Code Comparison

openapi-typescript-codegen:

export class PetsService {
    public static getPets(): CancelablePromise<Array<Pet>> {
        return __request(OpenAPI, {
            method: 'GET',
            url: '/pets',
        });
    }
}

swagger-typescript-api:

export const Api = {
  getPets: () => 
    httpClient.request<Pet[]>({
      method: "GET",
      url: "/pets",
    }),
};

Both libraries generate TypeScript code for API clients, but openapi-typescript-codegen tends to create more structured and class-based code, while swagger-typescript-api generates more concise, functional-style code. The choice between them depends on your project's specific needs, preferred coding style, and the level of type safety required.

Pros of openapi-typescript

• Generates TypeScript types directly from OpenAPI schemas, without creating API client code
• Supports a wider range of OpenAPI/Swagger versions (2.0, 3.0, and 3.1)
• Offers a more lightweight and focused approach, ideal for projects that only need type definitions

Cons of openapi-typescript

• Does not generate API client code, requiring additional setup for making API calls
• May require more manual work to integrate with existing codebases or frameworks
• Limited customization options compared to swagger-typescript-api

Code Comparison

openapi-typescript:

import { paths } from './api';
type UserResponse = paths['/users/{userId}']['get']['responses']['200']['content']['application/json'];

swagger-typescript-api:

import { Api } from './api';
const api = new Api();
const user = await api.users.getUserById(userId);

Summary

openapi-typescript focuses on generating accurate TypeScript types from OpenAPI schemas, providing a lightweight solution for type-safe API interactions. It supports multiple OpenAPI versions but requires additional setup for making API calls. swagger-typescript-api, on the other hand, generates both types and API client code, offering a more comprehensive solution out of the box but with potentially less flexibility in certain scenarios.

Pros of openapi-typescript

• Generates TypeScript types directly from OpenAPI schemas, without creating API client code
• Supports a wider range of OpenAPI/Swagger versions (2.0, 3.0, and 3.1)
• Offers a more lightweight and focused approach, ideal for projects that only need type definitions

Cons of openapi-typescript

• Does not generate API client code, requiring additional setup for making API calls
• May require more manual work to integrate with existing codebases or frameworks
• Limited customization options compared to swagger-typescript-api

Code Comparison

openapi-typescript:

import { paths } from './api';
type UserResponse = paths['/users/{userId}']['get']['responses']['200']['content']['application/json'];

swagger-typescript-api:

import { Api } from './api';
const api = new Api();
const user = await api.users.getUserById(userId);

Summary

openapi-typescript focuses on generating accurate TypeScript types from OpenAPI schemas, providing a lightweight solution for type-safe API interactions. It supports multiple OpenAPI versions but requires additional setup for making API calls. swagger-typescript-api, on the other hand, generates both types and API client code, offering a more comprehensive solution out of the box but with potentially less flexibility in certain scenarios.