.

src/WebApplicationMinimalApi8/Dto/MessageDto.cs

@@ -0,0 +1,21 @@
+using FluentValidation;
+
+namespace WebApplicationMinimalApi8.Dto;
+
+public record MessageDto
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    /// <example>안녕하세요</example>
+    public required string Body { get; init; }
+
+}
+
+public class MessageDtoValidator : AbstractValidator<MessageDto>
+{
+    public MessageDtoValidator()
+    {
+        RuleFor(x => x.Body).NotEmpty();
+    }
+}   

src/WebApplicationMinimalApi8/Program.cs

@@ -1,10 +1,16 @@
-using Microsoft.Extensions.Hosting;
+using System.Reflection.Metadata.Ecma335;
+using FluentValidation;
+using Microsoft.OpenApi.Models;
+using WebApplicationMinimalApi8.Dto;
 using WebApplicationMinimalApi8.ExceptionHandlers;
 
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
+builder.Services.AddValidatorsFromAssemblyContaining<Program>();
+builder.AddFluentValidationEndpointFilter();
+
 if (builder.Environment.IsEnvironment("Best"))
 {
     builder.Services.AddExceptionHandler<BadRequestExceptionHandler>();
@@ -21,7 +27,32 @@
 {
     app.UseExceptionHandler();
 }
-
+
+app.MapPost("/validate", (MessageDto message) => message)
+   .WithDescription("메시지를 검증합니다.")
+
+   .AddFluentValidationFilter()
+   .WithOpenApi(x =>
+   {
+       x.RequestBody = new OpenApiRequestBody
+       {
+           Content =
+           {
+               ["application/json"] = new OpenApiMediaType
+               {
+                   Schema = new OpenApiSchema
+                   {
+                       Reference = new OpenApiReference
+                       {
+                           Id = "MessageDto",
+                           Type = ReferenceType.Schema
+                       }
+                   }
+               }
+           }
+       };
+       return x;
+   });
 
 app.MapGet("/500", () =>
 {

src/WebApplicationMinimalApi8/WebApplicationMinimalApi8.csproj

@@ -7,6 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="FluentValidation" Version="11.9.0" />
+    <PackageReference Include="FluentValidation.AspNetCore" Version="11.3.0" />
+    <PackageReference Include="ForEvolve.FluentValidation.AspNetCore.Http" Version="1.0.26" />
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.2" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.5.0" />
   </ItemGroup>