Configure the MobileFirst Logger

We can configure how the MobileFirst Logger runs on a range of client operating systems by modifying WL.Logger methods.

• Set log level after IBM MobileFirst Platform Foundation starts
  Logger is always on, but we can set the log level after IBM MobileFirst Platform Foundation starts.

• Select log levels
  We can select from among various log levels.

• Log different data types
  We can log a range of data types including numbers, strings, and arrays

• Set Logger priority
  We can configure the Logger to display only warning and error log messages.

• Filter log levels
  We can filter logs to display only logs of equal or lower priority, set by the level property.

• Log package whitelist and blacklist
  We can associate a set of log messages with a specific part of the application.

• Create log for package
  We can create a logger for a specific package.

• Stringify
  We can convert arguments to strings using the stringify function.

• Callback
  We can pass a callback function to WL.Logger.config that will be called after every log message.

• Log message tags
  We can add context to a log message by appending the level tag, the package tag, or both.

• Method chaining
  We can invoke multiple method calls by chaining logger methods.

• Pretty-print JSON objects
  We can format JSON objects by enabling stringify.

• Print stack traces
  We can print stack traces for certain objects.

• Logger Android check and override
  Logger checks the operating system on which it is running to determine whether to use the Android logger. We can override this behavior.

• Environment-specific settings
  We can specify that logger options are selected according to the client environment.

• JavaScript module example
  View an example of how to use WL.Logger to add log messages to a JavaScript module.

Parent topic: Develop hybrid and web applications