aspnet-minimal-api
ASP.NET Core Minimal API endpoints, route groups, filters, and typed results. Covers modern .NET 8+ endpoint patterns. USE WHEN: user mentions "Minimal API", "MapGet", "MapPost", "route groups", "endpoint filters", ".NET minimal", "lambda endpoints" DO NOT USE FOR: Controller-based APIs (use `aspnet-core`), Express.js (use `express`), FastAPI (use `fastapi`)
What this skill does
# ASP.NET Minimal API - Quick Reference
> **Deep Knowledge**: Use `mcp__documentation__fetch_docs` with technology: `aspnet-core`, topic: `minimal-api` for comprehensive documentation.
## Basic Endpoints
```csharp
var app = WebApplication.Create(args);
app.MapGet("/api/users", async (IUserService service) =>
Results.Ok(await service.GetAllAsync()));
app.MapGet("/api/users/{id:int}", async (int id, IUserService service) =>
await service.GetByIdAsync(id) is { } user
? Results.Ok(user)
: Results.NotFound());
app.MapPost("/api/users", async (CreateUserRequest request, IUserService service) =>
{
var user = await service.CreateAsync(request);
return Results.Created($"/api/users/{user.Id}", user);
});
app.MapPut("/api/users/{id:int}", async (int id, UpdateUserRequest request, IUserService service) =>
await service.UpdateAsync(id, request) ? Results.NoContent() : Results.NotFound());
app.MapDelete("/api/users/{id:int}", async (int id, IUserService service) =>
{
await service.DeleteAsync(id);
return Results.NoContent();
});
app.Run();
```
## Route Groups
```csharp
var users = app.MapGroup("/api/users")
.WithTags("Users")
.RequireAuthorization();
users.MapGet("/", GetAll);
users.MapGet("/{id:int}", GetById);
users.MapPost("/", Create);
// Nested groups
var admin = app.MapGroup("/api/admin")
.RequireAuthorization("AdminOnly");
admin.MapGroup("/users").MapGet("/", GetAllUsers);
```
## Endpoint Filters
```csharp
// Validation filter
public class ValidationFilter<T> : IEndpointFilter where T : class
{
public async ValueTask<object?> InvokeAsync(
EndpointFilterInvocationContext context,
EndpointFilterDelegate next)
{
var argument = context.Arguments.OfType<T>().FirstOrDefault();
if (argument is null)
return Results.BadRequest("Invalid request body");
var validator = context.HttpContext.RequestServices.GetService<IValidator<T>>();
if (validator is not null)
{
var result = await validator.ValidateAsync(argument);
if (!result.IsValid)
return Results.ValidationProblem(result.ToDictionary());
}
return await next(context);
}
}
// Apply filter
users.MapPost("/", Create).AddEndpointFilter<ValidationFilter<CreateUserRequest>>();
```
## TypedResults (.NET 7+)
```csharp
app.MapGet("/api/users/{id:int}", async Task<Results<Ok<UserResponse>, NotFound>> (int id, IUserService service) =>
await service.GetByIdAsync(id) is { } user
? TypedResults.Ok(user)
: TypedResults.NotFound());
```
## Anti-Patterns
| Anti-Pattern | Why It's Bad | Correct Approach |
|--------------|--------------|------------------|
| All endpoints in Program.cs | Hard to maintain | Use route groups and extension methods |
| No validation | Accepts bad input | Use endpoint filters |
| Inline business logic | Not testable | Inject services |
| Not using TypedResults | No OpenAPI metadata | Use `TypedResults` for typed responses |
## Quick Troubleshooting
| Issue | Likely Cause | Solution |
|-------|--------------|----------|
| Parameter not bound | Wrong type or name | Use explicit `[FromRoute]` / `[FromQuery]` |
| Filter not executing | Not registered | Add with `AddEndpointFilter<T>()` |
| OpenAPI missing types | Using `Results.Ok()` | Use `TypedResults.Ok()` |
| Route conflicts | Ambiguous routes | Add route constraints like `{id:int}` |
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