ASP.NET Core Global Exception Handling: Practical Guide

Handling exceptions in every controller or endpoint quickly becomes repetitive. ASP.NET Core provides centralized mechanisms so unexpected failures can be logged and converted into consistent responses.

🧩 Why Centralize Exception Handling?

Keep endpoints focused on application logic.
Return consistent error responses.
Log unexpected failures in one place.
Avoid exposing internal exception details to clients.

⚡ Use Exception Handler Middleware

A simple application-level configuration can enable centralized exception handling:

var app = builder.Build();

if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/error");
}

The exact endpoint or handler can be designed around the application's API or MVC architecture.

🛠️ Custom Middleware

For APIs that need a consistent JSON response, custom middleware can catch exceptions and write an appropriate response.

public async Task InvokeAsync(HttpContext context)
{
    try
    {
        await _next(context);
    }
    catch (Exception ex)
    {
        _logger.LogError(ex, "Unhandled exception");
        context.Response.StatusCode = 500;
        await context.Response.WriteAsJsonAsync(
            new { message = "An unexpected error occurred." });
    }
}

🔐 Don't Leak Sensitive Details

Returning the complete exception message or stack trace to a production client can reveal implementation details. Log the exception internally and return a safe public message.

🧪 Development vs Production

Detailed developer exception information is useful while developing, but production responses should normally be controlled and predictable.

🧠 Key Takeaway

Centralized exception handling keeps ASP.NET Core applications cleaner and gives clients consistent, safer error responses.

Continue with ⚡ ASP.NET Core Tutorials.

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