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DevDash

Last updated: April 13, 2026

Env Validator for C# / .NET Developers

Quick Answer

DevToolHQ's env validator works great alongside C# / .NET. Use it to quickly env validator during development, then integrate the pattern into your C# / .NET codebase using the code example below.

Use Cases in C# / .NET

  • 1.Validate required env vars at application startup
  • 2.Catch missing configuration before deployment
  • 3.Type-check environment variable values
  • 4.Provide clear error messages for missing config

C# / .NET Code Example

C# / .NET
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

// appsettings.json + env override pattern (ASP.NET Core)
var builder = WebApplication.CreateBuilder(args);

// Access env var
var dbUrl = builder.Configuration["DATABASE_URL"]
    ?? throw new InvalidOperationException("DATABASE_URL is required");

// Strongly typed config
builder.Services.AddOptions<AppSettings>()
    .Bind(builder.Configuration.GetSection("App"))
    .ValidateDataAnnotations()
    .ValidateOnStart();

record AppSettings {
    [Required] public string DatabaseUrl { get; init; } = "";
    public int Port { get; init; } = 5000;
}

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Open Env Validator

Frequently Asked Questions

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