quiver_log 1.0.5

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Quiver Log

Quiver log is a set of logging utilities that make it easy to configure and manage Dart's built in logging capabilities.



The Basics

Dart's built-in logging utilities are fairly low level. This means each time you start a new project you have to copy/paste a bunch of logging configuration code to setup output locations and logging formats. Quiver-log provides a set of higher-level abstractions to make it easier to get logging setup correctly. Specifically, there are two new concepts: appender and formatter. Appenders define output locations like the console, http or even in-memory data structures that can store logs. Formatters, as the name implies, allow for custom logging formats.

Here is a simple example that sets up a InMemoryAppender with a SimpleStringFormatter:

import 'package:logging/logging.dart';
import 'package:quiver_log/log.dart';

class SimpleStringFormatter implements FormatterBase<String> {
  String call(LogRecord record) => record.message;

main() {
  var logger = new Logger('quiver.TestLogger');
  var appender = new InMemoryListAppender(new SimpleStringFormatter());

That's all there is to it!

Quiver-log provides three Appenders: PrintAppender which uses Dart's print statement to write to the console, InMemoryListAppender which writes logs to a simple list (this can be useful for debugging or testing) and a WebAppender which will take advantage of web console methods to improve readability in your browser. Additionally, a single Formatter called BasicLogFormatter is included and uses a "MMyy HH:mm:ss.S" format. Of course there is no limit to what kind of appenders you can create, we have plans to add appenders HTTP, WebSocket, DOM, Isolate and SysOut.

To create a new kind of Appender simply extends Appender. To create a new Formatter just implement the Formatter typedef or FormatterBase class if you need to hold state in your formtatter. Take a look at PrintAppender and BasicLogFormatter for an example.

1. Depend on it

Add this to your package's pubspec.yaml file:

  quiver_log: "^1.0.5"

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:quiver_log/log.dart';

import 'package:quiver_log/web.dart';
Version Uploaded Documentation Archive
1.0.5 May 9, 2016 Go to the documentation of quiver_log 1.0.5 Download quiver_log 1.0.5 archive
1.0.4 May 3, 2016 Go to the documentation of quiver_log 1.0.4 Download quiver_log 1.0.4 archive
1.0.3 Aug 8, 2014 Go to the documentation of quiver_log 1.0.3 Download quiver_log 1.0.3 archive
1.0.2 Aug 8, 2014 Go to the documentation of quiver_log 1.0.2 Download quiver_log 1.0.2 archive
1.0.1 Mar 30, 2014 Go to the documentation of quiver_log 1.0.1 Download quiver_log 1.0.1 archive
1.0.0 Mar 30, 2014 Go to the documentation of quiver_log 1.0.0 Download quiver_log 1.0.0 archive


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More details: scoring.

We analyzed this package, and provided a score, details, and suggestions below.

  • completed on Feb 3, 2018
  • Dart: 2.0.0-dev.20.0
  • pana: 0.10.1


Describes how popular the package is relative to other packages. [more]
71 / 100
Code health derived from static analysis. [more]
97 / 100
Reflects how tidy and up-to-date the package is. [more]
20 / 100
Overall score:
Weighted score of the above. [more]


Detected platforms: web

Platform components identified in package: html.


  • Maintain CHANGELOG.md.

    Changelog entries help clients to follow the progress in your code.

  • Use constrained dependencies.

    The pubspec.yaml contains 2 dependencies without version constraints. Specify version ranges for the following dependencies: intl, logging.

  • The description is too short.

    Add more detail about the package, what it does and what is its target use case. Try to write at least 60 characters.

  • Maintain an example.

    None of the files in your example/ directory matches a known example patterns. Common file name patterns include: main.dart, example.dart or you could also use quiver_log.dart.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=0.8.7
intl >=0.9.9 0.15.2
logging >=0.9.0 0.11.3+1
Transitive dependencies
path 1.5.1
Dev dependencies
mock >=0.10.0
test >=0.12.13