log

The log built-in module is available to use in your EdgeWorkers code bundles to log messages generated during the current request.

To deliver the logging results from the log module you can either:

Enable enhanced debug headers or;
Use a DataStream 2.

Logging only occurs once you’ve requested logging information using Enable enhanced debug headers or a DataStream 2 stream. For more information refer to the JavaScript logging section.

log()

Replaces the format string with the contents of the arguments parameter. The event handler log headers records this change. If you disable logging, the format string is not replaced and the event log headers are not changed.

import { logger } from 'log'; // Import the logger module
export function onClientRequest (request) {
  let random_value_0_to_10 = Math.floor(Math.random() * 10);
  if( random_value_0_to_10 > 5){ //  Simulate an error for some requests
      logger.error("Oh no, a seemingly random bug appeared! Value: %i", random_value_0_to_10);
   }
  logger.info("Responding with hello world from the path: %s", request.path);
  logger.debug("Request device - is mobile: %s", request.device.isMobile);
  request.respondWith(
    200, {},
    '<html><body>\
    <h1>Hello World From Akamai EdgeWorkers</h1>\
    </body></html>');
  }
export function onClientResponse (request, response) {
    let data = {
        name: "EdgeWorkers",
        value: 1,
    };  
  logger.info("Data object: %o", data)//Log complex object
}

Parameter	Type	Description
format	String	The logging header message text.
arguments	Any type	Zero or more values formatted according to the format string.