HealthChecker fails to deserialize a valid JSON string

[kikaragyozov]

If you have written the following json string:

"{ \"msg\": \"Hello World!\\n\"}"

For a webhook's payload in your appsettings.json configuration file, the library will fail to deserialize it, whereas if you pass the above string to System.Text.Json.JsonSerializer, it will successfully parse it.

After debugging, the issue occurs here:

AspNetCore.Diagnostics.HealthChecks/src/HealthChecks.UI/Middleware/UIWebHooksApiMiddleware.cs

Line 34 in 76c1ad2

Payload = string.IsNullOrEmpty(item.Payload) ? new JsonObject() : JsonNode.Parse(Regex.Unescape(item.Payload))

The Regex.Unescape call turns the above into an invalid json string. Why are we escaping exactly?

Currently it's impossible to define a new line in the JSON webhook payload object, until the above is somehow addressed.

The exception is thrown when you go to the "Webhooks" section in the UI.

[JonathanNagy]

After figuring out webhooks this morning, the issue seems to be just in the UI. The actual webhook delivers properly with newlines, but the UI shows "Error fetching webhooks information" on the Webhooks tab.