C# › Exception Handling
How would you design a robust global exception handling middleware in ASP.NET Core to convert unhandled exceptions into consistent API error responses?
AdvancedAnswer
Register custom exception-handling middleware (or use the built-in UseExceptionHandler) early in the pipeline to catch ANY unhandled exception from later middleware/controllers, log it, and transform it into a consistent, structured error response (like the RFC 7807 Problem Details format) instead of leaking raw stack traces to API consumers.
app.UseExceptionHandler(errorApp => {
errorApp.Run(async context => {
var exceptionFeature = context.Features.Get<IExceptionHandlerFeature>();
context.Response.StatusCode = 500;
context.Response.ContentType = "application/problem+json";
await context.Response.WriteAsJsonAsync(new {
title = "An unexpected error occurred",
status = 500,
detail = app.Environment.IsDevelopment() ? exceptionFeature?.Error.Message : null
});
});
});Real-world example Ensuring a production API never leaks internal stack traces or exception details to external clients, while still logging full details server-side.