ASPNET OpenAPI and Swagger — API Documentation in ASP.NET Core

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you'll learn about ASPNET Openapi Swagger. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

OpenAPI integration in ASP.NET Core generates standardized API documentation that enables client Code Generation and interactive testing.

builder.Services.AddOpenApi(options =>
{
    options.AddDocumentTransformer((document, context, cancellationToken) =>
    {
        document.Info = new()
        {
            Title = "Scan Service API",
            Version = "v2",
            Description = "Antivirus scan service with multi-engine support"
        };
        return Task.CompletedTask;
    });
});

app.MapOpenApi();

// Security scheme definition
builder.Services.AddOpenApi(options =>
{
    options.AddOperationTransformer((operation, context, cancellationToken) =>
    {
        operation.Security = [new OpenApiSecurityRequirement
        {
            [new OpenApiSecurityScheme
            {
                Reference = new() { Id = "BearerAuth", Type = ReferenceType.SecurityScheme }
            }] = []
        }];
        return Task.CompletedTask;
    });
});

// app.UseSwaggerUI() for interactive docs

OpenAPI documentation ensures your API consumers have accurate, up-to-date reference material for integration.

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