Cocoar.Configuration 5.0.0

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package Cocoar.Configuration --version 5.0.0
                    


                    

                
NuGet\Install-Package Cocoar.Configuration -Version 5.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Cocoar.Configuration" Version="5.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Cocoar.Configuration" Version="5.0.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Cocoar.Configuration" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Cocoar.Configuration --version 5.0.0
                    


                    

                
#r "nuget: Cocoar.Configuration, 5.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Cocoar.Configuration@5.0.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Cocoar.Configuration&version=5.0.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Cocoar.Configuration&version=5.0.0
                    


                            Install as a Cake Tool

Reactive, strongly-typed configuration layering for .NET

Cocoar.Configuration

License: Apache-2.0 NuGet Downloads

Zero ceremony configuration that updates itself. Define a class, add a rule, inject it — no IOptions<T> wrappers, no Configure<T>() calls.

Install

dotnet add package Cocoar.Configuration              # Core library (console apps)
dotnet add package Cocoar.Configuration.DI            # + Microsoft.Extensions.DI
dotnet add package Cocoar.Configuration.AspNetCore     # + health endpoints, feature flags

You only need one — each includes everything above it. Requires .NET 8+.

Quick Start

var builder = WebApplication.CreateBuilder(args);

builder.AddCocoarConfiguration(c => c
    .UseConfiguration(rule => [
        rule.For<AppSettings>().FromFile("appsettings.json"),
        rule.For<AppSettings>().FromEnvironment("APP_"),
    ]));

var app = builder.Build();

// Inject directly — no wrapper
app.MapGet("/settings", (AppSettings settings) => new
{
    settings.AppName,
    settings.MaxRetries
});

app.Run();

Key Features

  • Zero Ceremony — Define a class, add a rule, inject it. Just your POCO.
  • Reactive by Default — IReactiveConfig<T> updates automatically when sources change.
  • Atomic Updates — IReactiveConfig<(T1, T2)> guarantees consistent snapshots across types.
  • Explicit Layering — Rules execute in order, last write wins. File, environment, CLI, HTTP.
  • Memory-Safe Secrets — Secret<T> with automatic zeroization and X.509 hybrid encryption.
  • Feature Flags & Entitlements — Strongly-typed, source-generated, with expiry health monitoring.
  • Health Monitoring — Per-rule status tracking, OpenTelemetry metrics, ASP.NET Core health checks.
  • Compile-Time Validation — Roslyn analyzers catch configuration errors in your IDE.
  • First-Class Testing — CocoarTestConfiguration with AsyncLocal<T> isolation.

Providers

Provider Fluent API Package
File (JSON) .FromFile("path") Core
Environment Variables .FromEnvironment("PREFIX_") Core
Command Line .FromCommandLine("--prefix") Core
Static / Observable .FromStaticJson() / .FromObservable() Core
HTTP .FromHttp(url) Http
Microsoft IConfiguration .FromIConfiguration(config) MicrosoftAdapter

Examples

Explore real-world scenarios in the examples directory.

Contributing

Contributions welcome! See CONTRIBUTING.md for guidelines.

License

Apache-2.0 — see NOTICE for details.

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 is compatible.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (7)

Showing the top 5 NuGet packages that depend on Cocoar.Configuration:

Package Downloads
Cocoar.Configuration.AspNetCore

ASP.NET Core integration for Cocoar.Configuration. Health check endpoints, feature flag and entitlement REST evaluation endpoints, and WebApplicationBuilder extensions.
Cocoar.Configuration.MicrosoftAdapter

Adapter for bridging Microsoft.Extensions.Configuration (IConfiguration) with Cocoar.Configuration, enabling gradual migration and coexistence with existing Microsoft configuration sources while leveraging reactive updates.
Cocoar.Configuration.HttpPolling

HTTP polling provider for Cocoar.Configuration enabling remote configuration sources with configurable polling intervals, automatic retries, and failure sentinel values for resilient distributed configuration management.
Cocoar.Configuration.DI

Dependency injection integration for Cocoar.Configuration. Configuration type registration, lifetime customization, keyed services, and context resolver registration for feature flags and entitlements.
Cocoar.Configuration.Secrets

Secure secrets management for Cocoar.Configuration using hybrid RSA+AES encryption. Store encrypted secrets directly in JSON configuration files with X.509 certificate-based decryption and automatic memory zeroing.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
5.0.0 136 3/24/2026
5.0.0-beta.8 32 3/24/2026
5.0.0-beta.2 77 3/19/2026
4.3.0-flags.4 53 3/10/2026
4.3.0-beta.3 39 3/19/2026
4.2.1 213 2/3/2026
4.2.0 155 2/3/2026
4.2.0-master-backplane-arch... 65 2/3/2026
4.2.0-master-backplane-arch... 64 2/2/2026
4.2.0-master-backplane-arch... 55 2/2/2026
4.2.0-master-backplane-arch... 62 2/1/2026
4.2.0-beta.5 62 1/30/2026
4.2.0-beta.4 58 1/30/2026
4.2.0-beta.3 57 1/30/2026
4.2.0-beta.2 64 1/30/2026
4.2.0-beta.1 58 1/30/2026
4.1.0 170 1/11/2026
4.0.0 165 1/8/2026
3.4.0-secrets.36 214 11/16/2025
3.4.0-beta.6 255 11/16/2025
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Full release notes: https://github.com/cocoar-dev/cocoar.configuration/blob/develop/CHANGELOG.md