Log Message

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With the log-message action you can create messages that appear in the log of your Mendix application.

Action Properties

Log level

The log level defines the severity of the log message. In the modeler console dock, messages have a different color and an icon for some log levels.

Option Icon Description
Trace   Used for detailed execution traces.
Debug   Used to debug execution.
Info   Used to log informative messages.
Warning Used to log warnings. These messages appear in orange.
Error Used to log error messages. These messages appear in red.
Critical Used to log critical errors. These messages appear in white on red .

Default value: Info

Log node name

The log node name is a microflow expression that defines the source of the log message. For example, if you log messages from an email module, the log node name could be ‘Email module’.


Template defines the text of the message. The template can contain parameters that are written as a number between braces, e.g. {1}. The first parameter has number 1, the second 2 etcetera.


For each parameter in the template you define a microflow expression of which the value will be inserted at the position of the parameter. Parameters need to be entered using microflow expressions resulting in a string.

With parameters you can customize your message with data specific to the situation. For example, the message “An e-mail has been sent to customer {1}.” with parameter $customer/FullName will show the full name of the customer to whom an e-mail has been sent.

Include latest stack trace

Defines whether to include the stack trace of the latest error in this log message. In the modeler, log messages that include a stack trace are marked with a paperclip icon () and double-clicking them shows the stack trace.