JSNlog Exception formatting problem has surfaced

Encountering an issue with JSNlog and Nlog regarding the format of Exceptions from JSNlog. All error logs are being written out in JSON, but when an exception is thrown from JavaScript, the system encodes the %message property as JSON as well, causing the main JSON to become invalid.

The configuration for the Nlog.config file for this appender is:

layout='{"Enviroment":"${aspnet-application:variable=Enviroment}","CreatedOn": "${longdate:universalTime=true}", "WindowsIdentity":"${aspnet-user-identity:jsonEncode=true}","Application":"${AppName}", "Level":"${level}", ${message}}' />

The configuration for the web.config for JSNlog is:

serverSideMessageFormat=""UserAgent": "%userAgent", "SessionId": "%requestId", "URL":"%url", "UserAddress": "%userHostAddress", "Message": "%message""

With this configuration, it works fine for normal logging calls but fails on fatalException calls due to the resulting invalid JSON structure. For example:

{"Enviroment":"Dev", "CreatedOn": "2014-09-24 23:58:42.1734", "WindowsIdentity":"XXXr","Application":"LoggingTest", "Level":"Fatal", "UserAgent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36", "SessionId": "befn1iy4mlxqowppwepf104z", "URL":"/LoggingTest/jsnlog.logger", "UserAddress": "10.247.224.202", "Message": "{"stack":"TypeError: undefined is not a function\n    at Log (http://zue-v-86a32393.vpc-am.aws.shell-cloud.com/LoggingTest/:58:16)\n    at HTMLInputElement.onclick (http:/XXXX/LoggingTest/:66:141)","message":"undefined is not a function","name":"TypeError","logData":"JS Fatal Exception"}"}

Attempting to remove quotes around messages resolves the issue for fatalException calls but breaks JSON validity for other log types.

If anyone has a solution or suggestion on handling this problem with proper formatting of exceptions from fatalException calls, your insights would be greatly appreciated.

javascriptc#jsonnlogjsnlog

Answer №1

Hi there, I'm the creator of JSNLog.

The issue at hand stems from a bug within JSNLog. When logging an object on the client side, it gets sent as a JSON string like { "x": 44 }. This includes quotes. However, when logging a simple string, it is transmitted without surrounding quotes and any quotes inside the string are not escaped - thus causing compatibility issues with JSON objects.

While this setup typically functions fine for simple string log entries, problems arise when attempting to log valid JSON objects.

Although untested, it's likely that using your original configuration to log a string containing a quote on the client will result in the same error experienced with fatalException.

To resolve this issue, I have implemented a new property called %jsonmessage, which properly encloses and escapes strings. You can utilize this property in your existing configuration to achieve the desired outcome you had with fatalException.

I'll provide updates on any developments in the comments section below this answer.

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