OpenApiClient.Cli 1.0.0-preview.3

This is a prerelease version of OpenApiClient.Cli.
dotnet tool install --global OpenApiClient.Cli --version 1.0.0-preview.3                
This package contains a .NET tool you can call from the shell/command line.
dotnet new tool-manifest # if you are setting up this repo
dotnet tool install --local OpenApiClient.Cli --version 1.0.0-preview.3                
This package contains a .NET tool you can call from the shell/command line.
#tool dotnet:?package=OpenApiClient.Cli&version=1.0.0-preview.3&prerelease                
nuke :add-package OpenApiClient.Cli --version 1.0.0-preview.3                

☄️ OpenAPI Client

Created with ❤ in Poland by
OpenAPI Client is a toolkit that helps you create HTTP clients for external APIs based on their OpenAPI specifications. It simplifies the process of consuming and interacting with various web services. The project is developed and maintained by and other community contributors.

👀 What does this repo contain?

The repository contains NuGet package source code, which uses C# code generators that can be used to generate native C# API clients from YAML or JSON files.

Gettings started

OpenApiClient is available as NuGet package on

You can add it to your project using .NET CLI:

dotnet add package OpenApiClient

, or package manager console:

NuGet\Install-Package OpenApiClient

Define an Open API file as content in your .csproj file.

<Project Sdk="Microsoft.NET.Sdk">


    <PackageReference Include="OpenApiClient" Version="1.0.0">
      <IncludeAssets>compile; build; analyzers</IncludeAssets>

    <OpenApiContract Include="" />


Define your partial class as open api client

/// <summary>
/// My YouTube Client.
/// </summary>
public partial class YouTubeClient;

You can now use your generated client!

IYouTubeClient client = new YouTubeClient(new HttpClient());

var subscribersCount = client.SubscribersCountAsync("mychannel", CancellationToken.None);

Known limitations

Since we are using the generated internal OpenApiAttribute as a marker, conflicts may occur when we use InternalsVisibleTo.

We found the use of nullable essential, so C# 8.0 is required.


OpenAPI specification is available at:

Community Toolkit

The OpenAPI Client is inspired by the MVVM Community Toolkit:


Use Visual Studio 2022 and invoke the .sln.

Visual Studio
OpenAPI Client is an Open Source project. You are entitled to download and use the freely available Visual Studio Community Edition to build, run or develop for OpenAPI Client. As per the Visual Studio Community Edition license, this applies regardless of whether you are an individual or a corporate user.

Code of Conduct

This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community.


OpenAPI Client is free and open source software licensed under MIT License. You can use it in private and commercial projects.
Keep in mind that you must include a copy of the license in your project.

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

This package has no dependencies.

Version Downloads Last updated
1.0.0-preview.3 48 5/30/2024