🚀 FastCrud — Minimal API CRUD Generator for .NET 9

FastCrud is a lightweight, flexible CRUD API generator for .NET 9.
It combines Minimal APIs + EF Core + DTOs + FluentValidation + Gridify + Auto-Swagger to let you bootstrap production-ready endpoints with minimal effort.

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📦 Install NuGet packages

Add the required FastCrud packages (version 0.2.1):

dotnet add package FastCrud.Abstractions -v 0.2.1
dotnet add package FastCrud.Core -v 0.2.1
dotnet add package FastCrud.Mapping.Mapster -v 0.2.1
dotnet add package FastCrud.PersistenceEfCore -v 0.2.1
dotnet add package FastCrud.Query.Gridify -v 0.2.1
dotnet add package FastCrud.Validation.FluentValidation -v 0.2.1
dotnet add package FastCrud.Web.MinimalApi -v 0.2.1

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⚙️ Configure Program.cs

Register FastCrud services:

builder.Services.AddFastCrudCore();
builder.Services.UseMapster();
builder.Services.UseGridifyQueryEngine();
builder.Services.UseFluentValidationAdapter();

Register EF repositories per entity:

builder.Services.AddEfRepository<Customer, Guid, AppDbContext>();
builder.Services.AddEfRepository<Order, Guid, AppDbContext>();

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🌐 Map CRUD Endpoints

Define CRUD endpoints for each entity + DTO set:

app.MapFastCrud<Customer, Guid, CustomerCreateDto, CustomerUpdateDto, CustomerReadDto>(
    "/api/customers",
    nameof(Customer),
    "v1"
);

app.MapFastCrud<Order, Guid, OrderCreateDto, OrderUpdateDto, OrderReadDto>(
    "/api/orders",
    nameof(Order),
    "v1",
    ~CrudOps.Delete // disable Delete
);

• Each entity requires 3 DTOs: CreateDto, UpdateDto, and ReadDto.
• By default, all CRUD operations are generated.
• To restrict operations, use the CrudOps flag with bitwise operators.

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✅ Validation

Add FluentValidation validators for your DTOs or entities:

public class CustomerValidator : AbstractValidator<Customer>
{
    public CustomerValidator()
    {
        RuleFor(x => x.FirstName).NotEmpty().WithMessage("First name is required.");
        RuleFor(x => x.LastName).NotEmpty();
        RuleFor(x => x.Email).NotEmpty().EmailAddress();
    }
}

Validation is applied automatically to requests.

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🔍 Filtering & Sorting with Gridify

Enable advanced query options by writing a Gridify profile:

public sealed class CustomerGridifyProfile : IGridifyMapperProfile<Customer>
{
    public void Configure(GridifyMapper<Customer> m)
    {
        m.Configuration.CaseInsensitiveFiltering = true;

        m.GenerateMappings()
         .AddMap("name", c => c.FirstName + " " + c.LastName)
         .RemoveMap(nameof(Customer.CreatedUtc));
    }
}

This enables expressive queries like:

• GET /api/customers?filter=name~"john"&sort=-CreatedUtc&page=1&pageSize=20

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🎉 Done!

With just a few lines, you get:

• Clean Minimal APIs
• Automatic Swagger docs
• DTO mapping (Mapster)
• Validation (FluentValidation)
• Filtering, sorting & paging (Gridify)