The Swagger API toolchain for .NET, Web API and TypeScript.
C# TypeScript Other
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NSwag: The Swagger API toolchain for .NET, Web API and TypeScript

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NSwag is a Swagger 2.0 API (OpenAPI) toolchain for .NET, Web API, TypeScript and other platforms, written in C#. The Swagger specification uses JSON and JSON Schema to describe a RESTful web API. The NSwag project provides tools to generate Swagger specifications from existing ASP.NET Web API controllers and client code from these Swagger specifications.

The project combines the functionality of Swashbuckle (Swagger generation) and AutoRest (client generation) in one tool chain. This way a lot of incompatibilites can be avoided and features which are not well described by the Swagger specification or JSON Schema are better supported (e.g. inheritance, enum and reference handling). The NSwag project heavily uses NJsonSchema for .NET for JSON Schema handling and C#/TypeScript class/interface generation.

The project is maintained and developed by Rico Suter and other contributors.

Ways to use the toolchain:

Swagger Generators:

Code Generators:


NuGet Packages

  • NSwag.Core (PCL 259): The Swagger reader and writer classes (Source Code)
  • NSwag.Annotations (PCL 259): Attributes to decorate Web API controllers to control the Swagger generation (Source Code)
  • NSwag.CodeGeneration (PCL 259): Classes to generate Swagger specifications from Web API controllers and C# and TypeScript clients (Source Code)
  • NSwag.AssemblyLoader (.NET 4.5+): Classes to load assemblies in an isolated AppDomain and generate Swagger specs from Web API controllers
  • NSwag.MSBuild (MSBuild .targets): Adds a .targets file to your Visual Studio project, so that you can run the NSwag command line tool in an MSBuild target
  • NSwag.AspNetCore (.NETStandard 1.6 and .NET 4.5.1+):
  • NSwag.AspNet.Owin (.NET 4.5+): OWIN Middlewares for serving Swagger specifications and Swagger UI
  • NSwagStudio (Chocolatey): Package to install the NSwagStudio and command line tools via Chocolatey

Usage in C#

The following code shows how to read a Swagger specification and generate C# client classes to call the described web services:

var swaggerSettings = new WebApiToSwaggerGeneratorSettings();
var swaggerGenerator = new WebApiToSwaggerGenerator(swaggerSettings);

var service = swaggerGenerator.GenerateForController<PersonsController>();

var clientSettings = new SwaggerToCSharpClientGeneratorSettings 
    ClassName = "MyClass",
    Namespace = "MyNamespace"
var clientGenerator = new SwaggerToCSharpClientGenerator(service, clientSettings);

var code = clientGenerator.GenerateFile();

Check out the project Wiki for more information.


The generators can be used in a comfortable and simple Windows GUI called NSwagStudio: