OpenAPI (Swagger) Connected Service is a Visual Studio extension to generate C# HttpClient code for OpenAPI (formerly Swagger API) web service with NSwag

Simply put, it is like Add Service Reference for WCF or Add Web Reference for WSDL, but for JSON API.

Getting Started

Install from Tools -> Extensions and Updates menu inside Visual Studio or download as VSIX package from Visual Studio Marketplace

HowTos

• How to open *.nswag files with NSwagStudio from Solution Explorer
• How to add generated HttpClient to ASP.NET Core dependency injection (DI)

Troubleshooting

Generated code compilation errors

If your project target framework is net461 you might need to add the following packages via NuGet Package Manager:

• Newtonsoft.Json
• System.Net.Http
• System.Runtime.Serialization.Json

Can't open .nswag file in NSwagStudio

• If generated code corrupted, try to open .nswag file in NSwagStudio (Windows GUI for editing .*nswag files).
• If it doesn't open, try to create new .nswag file in NSwagStudio for the same API service link and check the differences.
• If you found bug, please report it here. Thank you in advance!

Roadmap

See the changelog for the further development plans and version history.

Feedback

Please feel free to request a feature or report a bug.

Support Development

Just consider buying me a coffee. Thank you for your support!