oklog #

A simple yet capable logging utility for Dart and Flutter. Just log. ok.

Features #

• Five log levels: trace, debug, info, warn, error
• Colored, emoji-decorated console output via ConsoleLogger
• Filter logs by class name using allowList and denyList
• Silent no-op logging via DummyLogger
• Global log instance ready to use out of the box

Getting started #

Add the dependency to your pubspec.yaml:

dependencies:
  oklog: ^1.0.0

Then import the library:

import 'package:oklog/oklog.dart';

Usage #

Basic logging #

import 'package:oklog/oklog.dart';

void main() {
  log.level = LogLevel.trace; // show all levels

  log.trace('main', 'Trace message');
  log.debug('main', 'Debug message');
  log.info('main', 'Info message');
  log.warn('main', 'Warning message');

  try {
    throw Exception('Something went wrong!');
  } catch (e, st) {
    log.error('main', 'An error occurred.', e, st);
  }
}

Using with a class instance #

Pass this as the first argument and the class name is resolved automatically:

class MyClass {
  void myMethod() {
    log.info(this, 'Hello from MyClass');
  }
}

Filtering with allowList and denyList #

// Only log messages from classes whose name contains 'main'
log.allowList = ['main'];

// Suppress log messages from classes whose name contains 'MyClass'
log.denyList = ['MyClass'];

// Clear filters
log.allowList.clear();
log.denyList.clear();

Silencing output with DummyLogger #

log = DummyLogger(); // all log calls become no-ops

Changing the log level #

log.level = LogLevel.warn; // only warn and error are printed

Log levels #