[Feature request]: No way to customize json generated

[NecroFilja]

Is your feature request related to a specific problem? Or an existing feature?

Hello,

We want to customize json generate. As we are very concentrated on performance we don't want to have new lines and indention in output. With current code it is not possible.

The only thing we could customise is - CustomDocumentSerializer, but it already receives pre-configured OpenApiJsonWriter with bool terseOutput = false so I could not do anything with it.

I couldn't write my own OpenApiJsonWriter custom implementation as TextWriter is hidden inside OpenApiJsonWriter in protected member. So technically I don;t see any way how to remove unnecessary spaces/newlines for us

Describe the solution you'd like

I would expect TextWriter is provided to custom serializer. Maybe there is more elegant solution

Additional context

No response

[martincostello]

You're right, this isn't currently possible. You would have to write your own version of the middleware so you could fully control the serialization.

This is something we could look at introducing in some way after the refactoring in #3286 is merged so that the writer can be user-provided:

Swashbuckle.AspNetCore/src/Swashbuckle.AspNetCore.Swagger/SwaggerMiddleware.cs

Lines 138 to 174 in 740c8ae

	private async Task RespondWithSwaggerJson(HttpResponse response, OpenApiDocument swagger)
	{
	string json;
	using (var textWriter = new StringWriter(CultureInfo.InvariantCulture))
	{
	var openApiWriter = new OpenApiJsonWriter(textWriter);
	SerializeDocument(swagger, openApiWriter);
	json = textWriter.ToString();
	}
	response.StatusCode = 200;
	response.ContentType = "application/json;charset=utf-8";
	await response.WriteAsync(json, UTF8WithoutBom);
	}
	private async Task RespondWithSwaggerYaml(HttpResponse response, OpenApiDocument swagger)
	{
	string yaml;
	using (var textWriter = new StringWriter(CultureInfo.InvariantCulture))
	{
	var openApiWriter = new OpenApiYamlWriter(textWriter);
	SerializeDocument(swagger, openApiWriter);
	yaml = textWriter.ToString();
	}
	response.StatusCode = 200;
	response.ContentType = "text/yaml;charset=utf-8";
	await response.WriteAsync(yaml, UTF8WithoutBom);
	}

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