How can I customize error responses in ASP.NET Core?

How can I customize error responses in ASP.NET Core?

You can customize error responses in ASP.NET Core by using middleware to handle exceptions and format the response.

What middleware should I use for this?

You can use the built-in ExceptionHandlerMiddleware or create your own custom middleware to handle errors.

Can you show me an example of custom middleware?

Sure! Here's a simple example:

public class CustomErrorMiddleware {
    private readonly RequestDelegate _next;

    public CustomErrorMiddleware(RequestDelegate next) {
        _next = next;
    }

    public async Task InvokeAsync(HttpContext context) {
        try {
            await _next(context);
        } catch (Exception ex) {
            context.Response.StatusCode = 500;
            await context.Response.WriteAsync("An error occurred: " + ex.Message);
        }
    }
}

Don't forget to register it in the Configure method!

How do I register the middleware in the Configure method?

You can register it like this:

public void Configure(IApplicationBuilder app, IHostingEnvironment env) {
    app.UseMiddleware<CustomErrorMiddleware>();
    // other middleware
}