Saturday 16 March 2024

In dataweave, how do i log a message? 148

In dataweave, how do i log a message?

DataWeave provides a built-in function named log that allows you to log messages during data transformation processes. Here's how to use it:

%dw 2.0
// Your DataWeave transformation logic
output = someTransformation(payload)

// Log a message with an optional prefix
log("Processing completed for message:", output)


  • The log function takes two arguments:

  • (Optional) Prefix: A string to prepend to the logged message.

  • Value: The actual message content you want to log. The value can be any expression that evaluates to a string.


The log function doesn't modify the output of your DataWeave script. Its primary purpose is to send logging messages to the Mule application console or configured logging destinations.

Integration with MuleSoft Flows:

  • When you use DataWeave within a MuleSoft flow, the logged messages appear in the console based on the configured logging level (e.g., INFO, DEBUG).

  • You can access the MuleSoft console logs using Studio or the server logs depending on your development environment.

Key Points:

  • log is a convenient way to track the execution flow and data manipulation steps within your DataWeave transformations.

  • It helps with debugging and understanding how your DataWeave scripts are processing data.

Additional Considerations:

  • Leverage conditional statements within the log function to control when messages are logged (e.g., only log for specific conditions).

  • Use string interpolation techniques to dynamically create informative log messages based on your data.

By effectively using the log function, you can enhance the observability and maintainability of your DataWeave transformations in MuleSoft applications.

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