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AGENTS.md

@@ -0,0 +1,74 @@
+# AGENTS.md
+
+Skeleton monorepo for React + .NET projects. Clone it, then replace the placeholder
+`User` domain with the real one.
+
+## Layout
+
+```
+backend/    ASP.NET Core Web API (net10.0)
+frontend/   Vite + React + TypeScript SPA
+```
+
+## Running
+
+| Stack | Command | URL |
+| --- | --- | --- |
+| Backend | `cd backend && dotnet run` | `http://localhost:5231` |
+| Frontend | `cd frontend && npm install && npm run dev` | `http://localhost:3000` |
+
+Start them in separate terminals. Allowed CORS origins live in `backend/appsettings.json`
+under `Cors:AllowedOrigins`.
+
+## Verifying changes
+
+Run these before considering a change done:
+
+```bash
+cd backend && dotnet build
+cd frontend && npm run build && npm run lint
+```
+
+## Backend conventions
+
+- `ImplicitUsings` is enabled. Do not re-import `Microsoft.AspNetCore.*`,
+  `Microsoft.Extensions.DependencyInjection`, `System.Linq`, and friends.
+- Use file-scoped namespaces (`namespace Backend.Data;`).
+- Repository methods are async, suffixed `Async`, and take a `CancellationToken`.
+- Read configuration through the options pattern (`IOptions<T>` + `Configure<T>`),
+  not `Configuration["Some:Key"]`.
+- Controllers stay thin: validate, delegate to a repository or service, map the result
+  to an `IActionResult`. No data access in controllers.
+- Route templates use `ApiRoutes.V1` rather than a hardcoded `"v1"` string.
+- Cross-cutting pipeline concerns (CORS, rate limiting) belong in `backend/Gateway/`
+  and are wired through `AddApiGateway` / `UseApiGateway`, not inline in `Program.cs`.
+- Persistence implementations register through `AddPersistence`, selected by the
+  `Persistence:Provider` setting. Swapping in EF Core or another store should not
+  require touching controllers.
+
+## Frontend conventions
+
+- All HTTP goes through `src/api/`. Components never call `fetch` directly.
+- Configuration comes from `VITE_*` environment variables; `VITE_API_BASE_URL` points
+  at the backend. Add new variables to `.env.example` and to the `ImportMetaEnv`
+  interface in `src/vite-env.d.ts`.
+- TypeScript is strict and unused locals are errors. The build runs `tsc -b` before Vite.
+
+## Endpoints
+
+| Method | Path | Purpose |
+| --- | --- | --- |
+| GET | `/health` | Liveness check, unversioned for infrastructure |
+| GET | `/v1/info` | App name, version, environment, server timestamp |
+| GET | `/v1/users` | List users |
+| GET | `/v1/users/{id}` | Fetch one user |
+| POST | `/v1/users` | Create a user |
+| PUT | `/v1/users/{id}` | Replace a user |
+| DELETE | `/v1/users/{id}` | Delete a user |
+
+Sample requests live in `backend/backend.http`.
+
+## Not included on purpose
+
+Authentication, a real database provider, tests, Docker, and structured logging are all
+left out. Add them when the project has requirements that justify a specific choice.

README.md

@@ -1,2 +1,74 @@
-# react-dotnet
+# React-Dotnet Frewaork Sekelon
-https://github.com/sethbr11/react-dotnet
+
+Once upon a time, people maintinaed "skeleton" repos they could clone to quickly jumpstart new projects. Why?  It was quick, free and it worked.
+
+### A. Always. B. Be. C. Cognitivaly TokenWoxxxening
+
+### This is a full-stask project jumpstarter with:
+
+### .NET backend
+### React/Vite frontend
+
+# .Net
+ Five CRUD endpoints return correct status codes:
+ 
+ 201 with a proper Location header
+ 400 on invalid email, 409 on duplicate, 204 then 404 on delete), 150 requests to /v1/info yielded exactly 100 successes and the rest 429, and 40 requests to /health all returned 200 while that window was exhausted.
+
+## Prerequisites
+
+- [.NET SDK](https://dotnet.microsoft.com/download) (project targets `net10.0`)
+- [Node.js](https://nodejs.org/) (LTS recommended)
+
+## Backend
+
+From the repository root:
+
+```bash
+cd backend
+dotnet run
+```
+
+The API runs at `http://localhost:5231`. Swagger UI is available in Development at `http://localhost:5231/swagger`.
+
+Skeleton endpoints:
+
+- `GET /health` — liveness check, exempt from rate limiting
+- `GET /v1/info` — app name, version, environment, and server timestamp
+- `GET|POST /v1/users`, `GET|PUT|DELETE /v1/users/{id}` — placeholder CRUD over the
+  in-memory repository
+
+Requests are rate limited per client IP using the `RateLimiting` section of
+`appsettings.json`, and allowed CORS origins come from the `Cors` section. Storage is
+selected by `Persistence:Provider`, which currently supports `InMemory` only; data is
+lost on restart until a real provider is registered in
+`backend/Data/PersistenceServiceCollectionExtensions.cs`.
+
+## Frontend
+
+From the repository root:
+
+```bash
+cd frontend
+npm install
+npm run dev
+```
+
+The app runs at `http://localhost:3000`.
+
+Copy `.env.example` to `.env.development` (or `.env.local`) if you need to customize the API URL:
+
+```
+VITE_API_BASE_URL=http://localhost:5231
+```
+
+## Running both
+
+Start the backend and frontend in separate terminals. The backend CORS policy allows requests from `http://localhost:3000` by default; change `Cors:AllowedOrigins` in `backend/appsettings.json` to add more.
+
+## Project structure
+
+```
+backend/    ASP.NET Core Web API
+frontend/   React + Vite + TypeScript SPA
+```

backend/Controllers/InfoController.cs

@@ -0,0 +1,30 @@
+using Backend.Gateway;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Backend.Controllers;
+
+[ApiController]
+[Route(ApiRoutes.V1 + "/[controller]")]
+public sealed class InfoController : ControllerBase
+{
+    private readonly IWebHostEnvironment _environment;
+
+    public InfoController(IWebHostEnvironment environment)
+    {
+        _environment = environment;
+    }
+
+    [HttpGet]
+    public IActionResult Get()
+    {
+        var assembly = typeof(InfoController).Assembly.GetName();
+
+        return Ok(new
+        {
+            name = assembly.Name ?? "backend",
+            version = assembly.Version?.ToString(3) ?? "0.0.0",
+            environment = _environment.EnvironmentName,
+            timestamp = DateTime.UtcNow,
+        });
+    }
+}

backend/Controllers/UserController.cs

@@ -1,17 +0,0 @@
-using Microsoft.AspNetCore.Mvc;
-using Backend.Data;
-
-namespace Backend.Controllers
-{
-    [Route("v1/[controller]")]
-    [ApiController]
-    public class UserController : ControllerBase
-    {
-        private readonly IUserRepository _userRepository;
-
-        public UserController(IUserRepository userRepository)
-        {
-            _userRepository = userRepository;
-        }
-    }
-}

backend/Controllers/UserRequests.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Backend.Controllers;
+
+// Validation attributes must target the primary constructor parameters, not the
+// generated properties; MVC rejects record types with property-level metadata.
+public sealed record CreateUserRequest(
+    [Required][EmailAddress] string Email,
+    [Required][StringLength(100, MinimumLength = 1)] string DisplayName);
+
+public sealed record UpdateUserRequest(
+    [Required][EmailAddress] string Email,
+    [Required][StringLength(100, MinimumLength = 1)] string DisplayName);

backend/Controllers/UsersController.cs

@@ -0,0 +1,96 @@
+using Backend.Data;
+using Backend.Gateway;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Backend.Controllers;
+
+[ApiController]
+[Route(ApiRoutes.V1 + "/[controller]")]
+public sealed class UsersController : ControllerBase
+{
+    private readonly IUserRepository _userRepository;
+
+    public UsersController(IUserRepository userRepository)
+    {
+        _userRepository = userRepository;
+    }
+
+    [HttpGet]
+    [ProducesResponseType<IReadOnlyList<User>>(StatusCodes.Status200OK)]
+    public async Task<IActionResult> GetAll(CancellationToken cancellationToken)
+        => Ok(await _userRepository.GetAllAsync(cancellationToken));
+
+    [HttpGet("{id:guid}")]
+    [ProducesResponseType<User>(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> GetById(Guid id, CancellationToken cancellationToken)
+    {
+        var user = await _userRepository.GetByIdAsync(id, cancellationToken);
+
+        return user is null ? NotFound() : Ok(user);
+    }
+
+    [HttpPost]
+    [ProducesResponseType<User>(StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> Create(
+        CreateUserRequest request,
+        CancellationToken cancellationToken)
+    {
+        if (await _userRepository.GetByEmailAsync(request.Email, cancellationToken) is not null)
+        {
+            return Conflict(new ProblemDetails
+            {
+                Title = "Email already in use",
+                Status = StatusCodes.Status409Conflict,
+            });
+        }
+
+        var user = await _userRepository.AddAsync(
+            new User { Email = request.Email, DisplayName = request.DisplayName },
+            cancellationToken);
+
+        return CreatedAtAction(nameof(GetById), new { id = user.Id }, user);
+    }
+
+    [HttpPut("{id:guid}")]
+    [ProducesResponseType<User>(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> Update(
+        Guid id,
+        UpdateUserRequest request,
+        CancellationToken cancellationToken)
+    {
+        var existing = await _userRepository.GetByIdAsync(id, cancellationToken);
+
+        if (existing is null)
+        {
+            return NotFound();
+        }
+
+        var emailOwner = await _userRepository.GetByEmailAsync(request.Email, cancellationToken);
+
+        if (emailOwner is not null && emailOwner.Id != id)
+        {
+            return Conflict(new ProblemDetails
+            {
+                Title = "Email already in use",
+                Status = StatusCodes.Status409Conflict,
+            });
+        }
+
+        existing.Email = request.Email;
+        existing.DisplayName = request.DisplayName;
+
+        var updated = await _userRepository.UpdateAsync(existing, cancellationToken);
+
+        return updated is null ? NotFound() : Ok(updated);
+    }
+
+    [HttpDelete("{id:guid}")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> Delete(Guid id, CancellationToken cancellationToken)
+        => await _userRepository.DeleteAsync(id, cancellationToken) ? NoContent() : NotFound();
+}

backend/Data/IUserRepository.cs

@@ -1,5 +1,22 @@
 namespace Backend.Data;
 
+/// <summary>
+/// Storage-agnostic access to <see cref="User"/>. Implementations are selected by the
+/// <c>Persistence:Provider</c> setting; see <see cref="PersistenceServiceCollectionExtensions"/>.
+/// </summary>
 public interface IUserRepository
 {
+    Task<IReadOnlyList<User>> GetAllAsync(CancellationToken cancellationToken = default);
+
+    Task<User?> GetByIdAsync(Guid id, CancellationToken cancellationToken = default);
+
+    Task<User?> GetByEmailAsync(string email, CancellationToken cancellationToken = default);
+
+    Task<User> AddAsync(User user, CancellationToken cancellationToken = default);
+
+    /// <returns>The updated user, or <c>null</c> when no user has the given id.</returns>
+    Task<User?> UpdateAsync(User user, CancellationToken cancellationToken = default);
+
+    /// <returns><c>true</c> when a user was removed.</returns>
+    Task<bool> DeleteAsync(Guid id, CancellationToken cancellationToken = default);
 }

backend/Data/InMemory/InMemoryUserRepository.cs

@@ -0,0 +1,58 @@
+using System.Collections.Concurrent;
+
+namespace Backend.Data.InMemory;
+
+/// <summary>
+/// Default implementation so the skeleton runs with no database. State is per-process
+/// and lost on restart.
+/// </summary>
+public sealed class InMemoryUserRepository : IUserRepository
+{
+    private readonly ConcurrentDictionary<Guid, User> _users = new();
+
+    public Task<IReadOnlyList<User>> GetAllAsync(CancellationToken cancellationToken = default)
+    {
+        IReadOnlyList<User> users = _users.Values
+            .OrderBy(user => user.CreatedAt)
+            .ToList();
+
+        return Task.FromResult(users);
+    }
+
+    public Task<User?> GetByIdAsync(Guid id, CancellationToken cancellationToken = default)
+    {
+        _users.TryGetValue(id, out var user);
+
+        return Task.FromResult(user);
+    }
+
+    public Task<User?> GetByEmailAsync(string email, CancellationToken cancellationToken = default)
+    {
+        var user = _users.Values
+            .FirstOrDefault(candidate => string.Equals(candidate.Email, email, StringComparison.OrdinalIgnoreCase));
+
+        return Task.FromResult(user);
+    }
+
+    public Task<User> AddAsync(User user, CancellationToken cancellationToken = default)
+    {
+        _users[user.Id] = user;
+
+        return Task.FromResult(user);
+    }
+
+    public Task<User?> UpdateAsync(User user, CancellationToken cancellationToken = default)
+    {
+        if (!_users.ContainsKey(user.Id))
+        {
+            return Task.FromResult<User?>(null);
+        }
+
+        _users[user.Id] = user;
+
+        return Task.FromResult<User?>(user);
+    }
+
+    public Task<bool> DeleteAsync(Guid id, CancellationToken cancellationToken = default)
+        => Task.FromResult(_users.TryRemove(id, out _));
+}

backend/Data/PersistenceOptions.cs

@@ -0,0 +1,13 @@
+namespace Backend.Data;
+
+public sealed class PersistenceOptions
+{
+    public const string SectionName = "Persistence";
+
+    public string Provider { get; set; } = PersistenceProviders.InMemory;
+}
+
+public static class PersistenceProviders
+{
+    public const string InMemory = "InMemory";
+}

backend/Data/PersistenceServiceCollectionExtensions.cs

@@ -0,0 +1,37 @@
+using Backend.Data.InMemory;
+
+namespace Backend.Data;
+
+/// <summary>
+/// Single place where a storage backend is chosen. To add a real database, implement
+/// <see cref="IUserRepository"/> and register it under a new provider name here;
+/// controllers stay untouched.
+/// </summary>
+public static class PersistenceServiceCollectionExtensions
+{
+    public static IServiceCollection AddPersistence(
+        this IServiceCollection services,
+        IConfiguration configuration)
+    {
+        services.Configure<PersistenceOptions>(configuration.GetSection(PersistenceOptions.SectionName));
+
+        var provider = configuration.GetSection(PersistenceOptions.SectionName).Get<PersistenceOptions>()?.Provider
+            ?? PersistenceProviders.InMemory;
+
+        switch (provider)
+        {
+            case PersistenceProviders.InMemory:
+                // Singleton because the store itself holds the data.
+                services.AddSingleton<IUserRepository, InMemoryUserRepository>();
+                break;
+
+            default:
+                throw new InvalidOperationException(
+                    $"Unknown persistence provider '{provider}'. Supported providers: " +
+                    $"'{PersistenceProviders.InMemory}'. Register additional providers in " +
+                    $"{nameof(PersistenceServiceCollectionExtensions)}.");
+        }
+
+        return services;
+    }
+}

backend/Data/User.cs

@@ -0,0 +1,15 @@
+namespace Backend.Data;
+
+/// <summary>
+/// Placeholder domain entity. Replace with the real model once the project has one.
+/// </summary>
+public sealed class User
+{
+    public Guid Id { get; init; } = Guid.NewGuid();
+
+    public required string Email { get; set; }
+
+    public required string DisplayName { get; set; }
+
+    public DateTime CreatedAt { get; init; } = DateTime.UtcNow;
+}

backend/Gateway/ApiRoutes.cs

@@ -0,0 +1,8 @@
+namespace Backend.Gateway;
+
+public static class ApiRoutes
+{
+    public const string V1 = "v1";
+
+    public const string Health = "/health";
+}

backend/Gateway/GatewayApplicationBuilderExtensions.cs

@@ -0,0 +1,14 @@
+namespace Backend.Gateway;
+
+public static class GatewayApplicationBuilderExtensions
+{
+    // CORS must run before the rate limiter so that rejected requests still carry
+    // the headers the browser needs to surface a 429 to the client.
+    public static IApplicationBuilder UseApiGateway(this IApplicationBuilder app)
+    {
+        app.UseCors(GatewayServiceCollectionExtensions.CorsPolicyName);
+        app.UseRateLimiter();
+
+        return app;
+    }
+}

backend/Gateway/GatewayOptions.cs

@@ -0,0 +1,19 @@
+namespace Backend.Gateway;
+
+public sealed class CorsOptions
+{
+    public const string SectionName = "Cors";
+
+    public string[] AllowedOrigins { get; set; } = [];
+}
+
+public sealed class RateLimitOptions
+{
+    public const string SectionName = "RateLimiting";
+
+    public int PermitLimit { get; set; } = 100;
+
+    public int WindowSeconds { get; set; } = 60;
+
+    public int QueueLimit { get; set; }
+}

backend/Gateway/GatewayServiceCollectionExtensions.cs

@@ -0,0 +1,64 @@
+using System.Threading.RateLimiting;
+using Microsoft.AspNetCore.RateLimiting;
+
+namespace Backend.Gateway;
+
+public static class GatewayServiceCollectionExtensions
+{
+    public const string CorsPolicyName = "DefaultCorsPolicy";
+
+    public static IServiceCollection AddApiGateway(
+        this IServiceCollection services,
+        IConfiguration configuration)
+    {
+        services.Configure<CorsOptions>(configuration.GetSection(CorsOptions.SectionName));
+        services.Configure<RateLimitOptions>(configuration.GetSection(RateLimitOptions.SectionName));
+
+        var corsSettings = configuration.GetSection(CorsOptions.SectionName).Get<CorsOptions>()
+            ?? new CorsOptions();
+        var rateLimitSettings = configuration.GetSection(RateLimitOptions.SectionName).Get<RateLimitOptions>()
+            ?? new RateLimitOptions();
+
+        services.AddCors(options => options.AddPolicy(CorsPolicyName, policy =>
+        {
+            if (corsSettings.AllowedOrigins.Length == 0)
+            {
+                return;
+            }
+
+            policy.WithOrigins(corsSettings.AllowedOrigins)
+                .AllowAnyHeader()
+                .AllowAnyMethod();
+        }));
+
+        services.AddRateLimiter(options =>
+        {
+            options.RejectionStatusCode = StatusCodes.Status429TooManyRequests;
+            options.GlobalLimiter = CreateGlobalLimiter(rateLimitSettings);
+        });
+
+        services.Configure<RouteOptions>(options => options.LowercaseUrls = true);
+
+        return services;
+    }
+
+    // Health checks are exempt so that infrastructure probes are never throttled.
+    private static PartitionedRateLimiter<HttpContext> CreateGlobalLimiter(RateLimitOptions settings) =>
+        PartitionedRateLimiter.Create<HttpContext, string>(context =>
+        {
+            if (context.Request.Path.StartsWithSegments(ApiRoutes.Health))
+            {
+                return RateLimitPartition.GetNoLimiter("health");
+            }
+
+            var partitionKey = context.Connection.RemoteIpAddress?.ToString() ?? "unknown";
+
+            return RateLimitPartition.GetFixedWindowLimiter(partitionKey, _ => new FixedWindowRateLimiterOptions
+            {
+                PermitLimit = settings.PermitLimit,
+                Window = TimeSpan.FromSeconds(settings.WindowSeconds),
+                QueueLimit = settings.QueueLimit,
+                QueueProcessingOrder = QueueProcessingOrder.OldestFirst,
+            });
+        });
+}

backend/Program.cs

@@ -1,36 +1,46 @@
-using Microsoft.AspNetCore.Builder;
+using System.Text.Json;
-using Microsoft.AspNetCore.Mvc;
+using Backend.Data;
-using Microsoft.EntityFrameworkCore;
+using Backend.Gateway;
-using Microsoft.Extensions.DependencyInjection;
+using Microsoft.AspNetCore.Diagnostics.HealthChecks;
-// using Backend.Data
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddControllers();
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
+builder.Services.AddHealthChecks();
+builder.Services.AddProblemDetails();
 
-builder.Services.AddCors();
+builder.Services.AddApiGateway(builder.Configuration);
-
+builder.Services.AddPersistence(builder.Configuration);
-//builder.Services.AddDbContext<UserContext>(options =>
-//   options.UseSqlite(builder.Configuration["ConnectionStrings:UserConnection"])
-//);
-
-//builder.Services.AddScoped<IBowlingLeagueRepository, EFBowlingLeagueRepository>(); 
 
 var app = builder.Build();
 
-// Configure the HTTP request pipeline.
+app.UseExceptionHandler();
+
 if (app.Environment.IsDevelopment())
 {
     app.UseSwagger();
     app.UseSwaggerUI();
 }
 
-app.UseCors(p => p.WithOrigins("http://localhost:3000"));
-
 app.UseHttpsRedirection();
 
-app.UseAuthorization();
+app.UseApiGateway();
+
+app.MapHealthChecks(ApiRoutes.Health, new HealthCheckOptions
+{
+    ResponseWriter = async (context, report) =>
+    {
+        context.Response.ContentType = "application/json";
+        var payload = JsonSerializer.Serialize(new
+        {
+            status = report.Status == HealthStatus.Healthy ? "healthy" : "unhealthy",
+        });
+        await context.Response.WriteAsync(payload);
+    },
+});
 
 app.MapControllers();
 

backend/appsettings.json

@@ -6,7 +6,17 @@
         }
     },
     "AllowedHosts": "*",
-    "ConnectionStrings": {
+    "Cors": {
-        "BowlingLeagueConnection": "Data Source=BowlingLeague.sqlite"
+        "AllowedOrigins": [
+            "http://localhost:3000"
+        ]
+    },
+    "RateLimiting": {
+        "PermitLimit": 100,
+        "WindowSeconds": 60,
+        "QueueLimit": 0
+    },
+    "Persistence": {
+        "Provider": "InMemory"
     }
 }

backend/backend.csproj

@@ -7,16 +7,6 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.2" />
-        <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.2">
-            <PrivateAssets>all</PrivateAssets>
-            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-        </PackageReference>
-        <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.2" />
-        <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.2">
-            <PrivateAssets>all</PrivateAssets>
-            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-        </PackageReference>
         <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
     </ItemGroup>
 

backend/backend.http

@@ -1,6 +1,46 @@
-@Backend_HostAddress = http://localhost:3000
+@Backend_HostAddress = http://localhost:5231
+@UserId = 00000000-0000-0000-0000-000000000000
 
-GET {{Backend_HostAddress}}/weatherforecast/
+GET {{Backend_HostAddress}}/health
 Accept: application/json
 
 ###
+
+GET {{Backend_HostAddress}}/v1/info
+Accept: application/json
+
+###
+
+GET {{Backend_HostAddress}}/v1/users
+Accept: application/json
+
+###
+
+POST {{Backend_HostAddress}}/v1/users
+Content-Type: application/json
+
+{
+  "email": "ada@example.com",
+  "displayName": "Ada Lovelace"
+}
+
+###
+
+GET {{Backend_HostAddress}}/v1/users/{{UserId}}
+Accept: application/json
+
+###
+
+PUT {{Backend_HostAddress}}/v1/users/{{UserId}}
+Content-Type: application/json
+
+{
+  "email": "ada@example.com",
+  "displayName": "Ada King"
+}
+
+###
+
+DELETE {{Backend_HostAddress}}/v1/users/{{UserId}}
+
+###

frontend/.env.development

@@ -0,0 +1 @@
+VITE_API_BASE_URL=http://localhost:5231

frontend/.env.example

@@ -0,0 +1 @@
+VITE_API_BASE_URL=http://localhost:5231

frontend/.gitignore

@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

frontend/eslint.config.js

@@ -0,0 +1,28 @@
+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+
+export default tseslint.config(
+  { ignores: ['dist'] },
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ['**/*.{ts,tsx}'],
+    languageOptions: {
+      ecmaVersion: 2022,
+      globals: globals.browser,
+    },
+    plugins: {
+      'react-hooks': reactHooks,
+      'react-refresh': reactRefresh,
+    },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      'react-refresh/only-export-components': [
+        'warn',
+        { allowConstantExport: true },
+      ],
+    },
+  },
+)

frontend/index.html

@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>React + .NET Starter</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

frontend/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.30.1",
+    "@types/react": "^19.1.8",
+    "@types/react-dom": "^19.1.6",
+    "@vitejs/plugin-react": "^4.6.0",
+    "eslint": "^9.30.1",
+    "eslint-plugin-react-hooks": "^5.2.0",
+    "eslint-plugin-react-refresh": "^0.4.20",
+    "globals": "^16.3.0",
+    "typescript": "~5.8.3",
+    "typescript-eslint": "^8.35.1",
+    "vite": "^7.0.4"
+  }
+}

frontend/public/vite.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="31.88" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 257"><defs><linearGradient id="IconifyId1813088fe1fbc01fb466" x1="-.828%" x2="57.636%" y1="7.652%" y2="78.411%"><stop offset="0%" stop-color="#41D1FF"></stop><stop offset="100%" stop-color="#BD34FE"></stop></linearGradient><linearGradient id="IconifyId1813088fe1fbc01fb467" x1="43.376%" x2="50.316%" y1="2.242%" y2="89.03%"><stop offset="0%" stop-color="#FFBD4F"></stop><stop offset="100%" stop-color="#FF980E"></stop></linearGradient></defs><path fill="url(#IconifyId1813088fe1fbc01fb466)" d="M255.153 37.938L134.897 252.976c-2.483 4.44-8.862 4.466-11.382.048L.875 37.958c-2.746-4.814 1.371-10.646 6.827-9.67l120.385 21.517a6.537 6.537 0 0 0 2.322-.004l117.867-21.483c5.438-.991 9.574 4.796 6.877 9.62Z"></path><path fill="url(#IconifyId1813088fe1fbc01fb467)" d="M185.432.063L96.44 17.501a3.268 3.268 0 0 0-2.634 3.014l-5.474 92.456a3.268 3.268 0 0 0 3.997 3.378l24.777-5.718c2.318-.535 4.413 1.507 3.936 3.838l-7.361 36.047c-.495 2.426 1.782 4.5 4.151 3.78l15.304-4.649c2.372-.72 4.652 1.36 4.15 3.788l-11.698 56.621c-.732 3.542 3.979 5.473 5.943 2.437l1.313-2.028l72.516-144.72c1.215-2.423-.88-5.186-3.54-4.672l-25.505 4.922c-2.396.462-4.435-1.77-3.759-4.114l16.646-57.705c.677-2.35-1.37-4.583-3.769-4.113Z"></path></svg>

frontend/src/App.css

@@ -0,0 +1,89 @@
+.app {
+  max-width: 720px;
+  margin: 0 auto;
+  padding: 3rem 1.5rem;
+}
+
+.app__header {
+  margin-bottom: 2rem;
+}
+
+.app__header h1 {
+  margin: 0 0 0.5rem;
+  font-size: 2rem;
+  font-weight: 600;
+}
+
+.app__header p {
+  margin: 0;
+  color: #64748b;
+}
+
+.app__section {
+  padding: 1.25rem 1.5rem;
+  border: 1px solid #e2e8f0;
+  border-radius: 8px;
+  background-color: #f8fafc;
+}
+
+.app__section h2 {
+  margin: 0 0 0.75rem;
+  font-size: 1.125rem;
+  font-weight: 600;
+}
+
+.app__section p {
+  margin: 0;
+  color: #475569;
+}
+
+.app__section code {
+  font-size: 0.875em;
+  background-color: #e2e8f0;
+  padding: 0.125rem 0.375rem;
+  border-radius: 4px;
+}
+
+.app__section--api {
+  margin-top: 1rem;
+}
+
+.app__status {
+  margin: 0.75rem 0 0;
+  font-weight: 500;
+}
+
+.app__status--loading {
+  color: #64748b;
+}
+
+.app__status--ok {
+  color: #15803d;
+}
+
+.app__status--error {
+  color: #b91c1c;
+}
+
+.app__info {
+  display: grid;
+  gap: 0.75rem;
+  margin: 1rem 0 0;
+}
+
+.app__info div {
+  display: grid;
+  grid-template-columns: 8rem 1fr;
+  gap: 0.5rem;
+}
+
+.app__info dt {
+  margin: 0;
+  color: #64748b;
+  font-weight: 500;
+}
+
+.app__info dd {
+  margin: 0;
+  color: #334155;
+}

frontend/src/App.tsx

@@ -0,0 +1,83 @@
+import { useEffect, useState } from 'react'
+import { apiBaseUrl, apiFetch } from './api/client'
+import './App.css'
+
+type InfoResponse = {
+  name: string
+  version: string
+  environment: string
+  timestamp: string
+}
+
+function App() {
+  const [info, setInfo] = useState<InfoResponse | null>(null)
+  const [error, setError] = useState<string | null>(null)
+  const [loading, setLoading] = useState(true)
+
+  useEffect(() => {
+    apiFetch<InfoResponse>('/v1/info')
+      .then(setInfo)
+      .catch((err: unknown) =>
+        setError(err instanceof Error ? err.message : 'Unknown error'),
+      )
+      .finally(() => setLoading(false))
+  }, [])
+
+  return (
+    <div className="app">
+      <header className="app__header">
+        <h1>React + .NET Starter</h1>
+        <p>A minimal monorepo skeleton for new projects.</p>
+      </header>
+
+      <section className="app__section">
+        <h2>Frontend</h2>
+        <p>
+          Vite + React + TypeScript running on port 3000. Extend{' '}
+          <code>src/App.tsx</code> to begin building your application.
+        </p>
+      </section>
+
+      <section className="app__section app__section--api">
+        <h2>Backend API</h2>
+        <p>
+          Requests go to <code>{apiBaseUrl}</code> via{' '}
+          <code>VITE_API_BASE_URL</code>.
+        </p>
+
+        {loading && <p className="app__status app__status--loading">Checking API…</p>}
+        {error && (
+          <p className="app__status app__status--error">
+            Unable to reach API: {error}
+          </p>
+        )}
+        {info && (
+          <dl className="app__info">
+            <div>
+              <dt>Status</dt>
+              <dd className="app__status app__status--ok">Connected</dd>
+            </div>
+            <div>
+              <dt>Name</dt>
+              <dd>{info.name}</dd>
+            </div>
+            <div>
+              <dt>Version</dt>
+              <dd>{info.version}</dd>
+            </div>
+            <div>
+              <dt>Environment</dt>
+              <dd>{info.environment}</dd>
+            </div>
+            <div>
+              <dt>Server time (UTC)</dt>
+              <dd>{new Date(info.timestamp).toISOString()}</dd>
+            </div>
+          </dl>
+        )}
+      </section>
+    </div>
+  )
+}
+
+export default App

frontend/src/api/client.ts

@@ -0,0 +1,17 @@
+const baseUrl = import.meta.env.VITE_API_BASE_URL
+
+export async function apiFetch<T>(
+  path: string,
+  init?: RequestInit,
+): Promise<T> {
+  const url = `${baseUrl}${path.startsWith('/') ? path : `/${path}`}`
+  const response = await fetch(url, init)
+
+  if (!response.ok) {
+    throw new Error(`API request failed: ${response.status} ${response.statusText}`)
+  }
+
+  return response.json() as Promise<T>
+}
+
+export { baseUrl as apiBaseUrl }

frontend/src/index.css

@@ -0,0 +1,28 @@
+:root {
+  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
+    sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+  color: #213547;
+  background-color: #ffffff;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+#root {
+  min-height: 100vh;
+}

frontend/src/main.tsx

@@ -0,0 +1,10 @@
+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)

frontend/src/vite-env.d.ts

@@ -0,0 +1,9 @@
+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly VITE_API_BASE_URL: string
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}

frontend/tsconfig.app.json

@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
+    "target": "ES2022",
+    "useDefineForClassFields": true,
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["src"]
+}

frontend/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}

frontend/tsconfig.node.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["vite.config.ts"]
+}

frontend/vite.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    port: 3000,
+    host: 'localhost',
+  },
+})