So right now, we are migrating from using apim module to context, but I can see we have two issues.

I. What is the alternative of apim.getError()? From what I understand, I think the two context variables error.name and error.message are equivalent to name and message returning from apim.getError(). But what about policyTitle and status?

{
  "name": "OperationError",
  "message": "This is a thrown Operation Error",
  "policyTitle": "Throw Operation Error",
  "status": {
    "code": "500",
    "reason": "Internal Server Error"
  }
}

II. If I have a JS script that exists in DataPower API Gateway's local directory, and I only load it in a GatewayScript. The script works perfectly fine with apim module but cannot identify "context" when being used instead. So how to use context in this scenario? (Without passing it to the script)

Hi Mohamed,
context.get('error') is the equalivant to apim.getError().  Using the GatewayScript debugger in a catch block gatewayscript policy you can see the error object which would include the status and policy Title.

(debug) p error
{
  name: 'JavaScriptError',
  message: 'Internal Error',
  status: { code: 500, reason: 'Internal Server Error' },
  policyTitle: 'gatewayscript'
}

As for your second question, nothing is currently documented that would allow this. Most probably this would need to be a request for enhancement.
Regards,

Steve