Change to response object in afterError hook not formatted as expected

In my hook.js file I have:

remotes.afterError('**', function(ctx, next, method){
        ctx.error = {
            code: ctx.error.statusCode,
            statusCode: ctx.error.statusCode,
            error: true,
            errors: [{
                message: ctx.error.message
            }],
            data: []
        };
        return next(ctx.error);
    });

My response object looks like this:

{
  "error": {
    "statusCode": 401,
    "code": 401,
    "error": true,
    "errors": [
      {
        "message": "login failed"
      }
    ],
    "data": []
  }
}

Why does it NOT look like this:

{
    "statusCode": 401,
    "code": 401,
    "error": true,
    "errors": [
      {
        "message": "login failed"
      }
    ],
    "data": []
  }

Which is the same thing minus the wrapping in an error object.

[bajtos]

The error response format is controller by error-handling middleware, which is typically strong-error-handler in LoopBack 3.x and recently scaffolded LoopBack 2.x applications.

You can replace strong-error-handler with your own middleware to control the format of JSON responses.

We had considered the ability to configure the format of HTTP responses in strong-error-handler too, but didn't have bandwidth to implement it yet - see loopbackio/strong-error-handler#8. Contributions welcome!