diff --git a/SqlDatabaseVectorSearch/Endpoints/AskEndpoints.cs b/SqlDatabaseVectorSearch/Endpoints/AskEndpoints.cs
index 12abe24..1976fe7 100644
--- a/SqlDatabaseVectorSearch/Endpoints/AskEndpoints.cs
+++ b/SqlDatabaseVectorSearch/Endpoints/AskEndpoints.cs
@@ -1,5 +1,5 @@
-
-using System.ComponentModel;
+using System.ComponentModel;
+using MinimalHelpers.FluentValidation;
 using SqlDatabaseVectorSearch.Models;
 using SqlDatabaseVectorSearch.Services;
 
@@ -10,11 +10,12 @@ public class AskEndpoints : IEndpointRouteHandlerBuilder
     public static void MapEndpoints(IEndpointRouteBuilder endpoints)
     {
         endpoints.MapPost("/api/ask", async (Question question, VectorSearchService vectorSearchService, CancellationToken cancellationToken,
-        [Description("If true, the question will be reformulated taking into account the context of the chat identified by the given ConversationId.")] bool reformulate = true) =>
+            [Description("If true, the question will be reformulated taking into account the context of the chat identified by the given ConversationId.")] bool reformulate = true) =>
         {
             var response = await vectorSearchService.AskQuestionAsync(question, reformulate, cancellationToken);
             return TypedResults.Ok(response);
         })
+        .WithValidation<Question>()
         .WithSummary("Asks a question")
         .WithDescription("The question will be reformulated taking into account the context of the chat identified by the given ConversationId.")
         .WithTags("Ask");
@@ -35,6 +36,7 @@ public class AskEndpoints : IEndpointRouteHandlerBuilder
 
             return Stream();
         })
+        .WithValidation<Question>()
         .WithSummary("Asks a question and gets the response as streaming")
         .WithDescription("The question will be reformulated taking into account the context of the chat identified by the given ConversationId.")
         .WithTags("Ask");
diff --git a/SqlDatabaseVectorSearch/Program.cs b/SqlDatabaseVectorSearch/Program.cs
index 8a194ba..5a3feab 100644
--- a/SqlDatabaseVectorSearch/Program.cs
+++ b/SqlDatabaseVectorSearch/Program.cs
@@ -1,5 +1,6 @@
 using System.Net.Mime;
 using System.Text.Json.Serialization;
+using FluentValidation;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.SemanticKernel;
 using SqlDatabaseVectorSearch.Components;
@@ -82,6 +83,9 @@ builder.Services.AddOpenApi(options =>
     options.AddDefaultProblemDetailsResponse();
 });
 
+ValidatorOptions.Global.LanguageManager.Enabled = false;
+builder.Services.AddValidatorsFromAssemblyContaining<Program>();
+
 builder.Services.AddDefaultProblemDetails();
 builder.Services.AddDefaultExceptionHandler();
 
diff --git a/SqlDatabaseVectorSearch/SqlDatabaseVectorSearch.csproj b/SqlDatabaseVectorSearch/SqlDatabaseVectorSearch.csproj
index 4e899aa..dc0daae 100644
--- a/SqlDatabaseVectorSearch/SqlDatabaseVectorSearch.csproj
+++ b/SqlDatabaseVectorSearch/SqlDatabaseVectorSearch.csproj
@@ -12,6 +12,7 @@
         <PackageReference Include="DocumentFormat.OpenXml" Version="3.3.0" />
         <PackageReference Include="EFCore.SqlServer.VectorSearch" Version="9.0.0-preview.2" />
         <PackageReference Include="EntityFrameworkCore.Exceptions.SqlServer" Version="8.1.3" />
+        <PackageReference Include="FluentValidation.DependencyInjectionExtensions" Version="12.0.0" />
         <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.4" />
         <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="9.0.4" />
         <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="9.0.4">
@@ -25,6 +26,7 @@
         <PackageReference Include="Microsoft.ML.Tokenizers.Data.O200kBase" Version="1.0.2" />
         <PackageReference Include="Microsoft.SemanticKernel" Version="1.48.0" />
         <PackageReference Include="MimeMapping" Version="3.1.0" />
+        <PackageReference Include="MinimalHelpers.FluentValidation" Version="1.1.3" />
         <PackageReference Include="MinimalHelpers.Routing.Analyzers" Version="1.1.3" />
         <PackageReference Include="PdfPig" Version="0.1.10" />
         <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="8.1.1" />
diff --git a/SqlDatabaseVectorSearch/Validators/QuestionValidator.cs b/SqlDatabaseVectorSearch/Validators/QuestionValidator.cs
new file mode 100644
index 0000000..538f654
--- /dev/null
+++ b/SqlDatabaseVectorSearch/Validators/QuestionValidator.cs
@@ -0,0 +1,12 @@
+using FluentValidation;
+using SqlDatabaseVectorSearch.Models;
+
+namespace SqlDatabaseVectorSearch.Validators;
+
+public class QuestionValidator : AbstractValidator<Question>
+{
+    public QuestionValidator()
+    {
+        RuleFor(x => x.Text).NotEmpty().MaximumLength(4096).WithName("Question Text");
+    }
+}