Persist formatting of original document with JsonDocument

Environment .net 6 minimal api

app.MapPost("/HandleStatusUpdate", async (System.Text.Json.JsonDocument jsonBody, [FromServices] IMediator mediator, Microsoft.AspNetCore.Http.HttpContext context) =>

I’m accepting webhook requests from a variety of sources and need to validate the message against a static key (static key + message = request header sha value) that I have from each service sending the request.

The issue I am having is that, when I convert the JsonDocument to string:

 using (var stream = new MemoryStream())
        {
            var writer = new Utf8JsonWriter(stream);
            jdoc.WriteTo(writer);
            writer.Flush();
            return Encoding.UTF8.GetString(stream.ToArray());
        }

it’s not re-creating the exact message that was sent (it removes spaces) so the verification step is failing. I’ve verified that if I take the original message sent and run it through the verification step that it DOES validate.

It is a JSON string being sent with content type of application/json. Since, I am accepting things from a variety of sources, I cant create a class that I can Serialize to.

I don’t think there’s a way I can tell the JsonDocument to persist the formatting of the Json document coming in, so is there a better way to handle this?

>Solution :

You may use JsonDocument.RootElement.GetRawText() to get the original JSON with the original formatting. From the docs:

JsonElement.GetRawText Method

Gets a string that represents the original input data backing this value.

Thus, you may just do:

return jdoc.RootElement.GetRawText();

Demo fiddle here.