How to turn off JSON error responses in ASP.NET Framework 4.5

Question

We have an old app and no matter what we do, we can't seem to get it to stop emitting JSON error responses. We want just a generic message that won't expose important security details.

We've compiled for Release. I don't see any DeveloperExceptionPage calls. I didn't write this project so I have no idea how they got it to do that in the first place.

Have you tried looking into; learn.microsoft.com/en-us/aspnet/web-api/overview/… or learn.microsoft.com/en-us/aspnet/web-api/overview/… — Jerdine Sabio
– Jerdine Sabio, Commented Jul 12 at 17:58

Bluebaron · Accepted Answer · 2025-07-15 15:34:22Z

1

I had to turn on customErrors in my web.config. Annoying that it's not off by default.

<customErrors defaultRedirect="GenericError.htm" mode="RemoteOnly">
      <error statusCode="500" redirect="InternalError.htm"/>
</customErrors>

answered Jul 15 at 15:34

Bluebaron

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