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A simple argument parser and handler, integrated with JSON and dart:io.

API Documentation

See the API Documentation for a full list of functions, classes and extension.


import 'dart:io';

import 'package:args_simple/args_simple_io.dart';

/// Examples of valid values for the parameter `args`:
/// - `/path/config.json --port 81 -verbose`
/// - `/path/config.json -verbose --sys-config /my/sys-config-dir`
/// - `/path/config.json root`
void main(List<String> _args) {
  var args = ArgsSimple.parse(_args);

  if (args.isEmpty) {
            'USAGE: [%configFile.json] [%user] [--port] [--sys-config %systemConfig] [-verbose]');

  // Argument #0 is a JSON `File`:
  var config = args.argumentMatches(0, RegExp(r'.json$'))
          ? args.argumentAsFileContentJSON(0)!
          : {};

  // Argument #1 is an optional `String`, with `guest` as default:
  var user = args.argumentAsString(1, 'guest');

  // Option `sys-config` is a `Directory`, with `/default/sys-config-dir` as default:
  var systemConfigDir = args.optionAsDirectory(
          'sys-config', Directory('/default/sys-config-dir'))!;

  // Option `--port` is an `int`, with 8080 as default:
  var port = args.optionAsInt('port', 8080);

  // Check for flag `-verbose`:
  var verbose = args.flag('verbose');

  if (verbose) {
    print('-- Config: $config');
    print('-- User: $user');
    print('-- System-Config Dir: $systemConfigDir');
    print('-- Port: $port');
    print('-- Verbose: $verbose');


The official source code is hosted @ GitHub:

Features and bugs

Please file feature requests and bugs at the issue tracker.


Any help from the open-source community is always welcome and needed:

  • Found an issue?
    • Please fill a bug report with details.
  • Wish a feature?
    • Open a feature request with use cases.
  • Are you using and liking the project?
    • Promote the project: create an article, do a post or make a donation.
  • Are you a developer?
    • Fix a bug and send a pull request.
    • Implement a new feature, like other training algorithms and activation functions.
    • Improve the Unit Tests.
  • Have you already helped in any way?
    • Many thanks from me, the contributors and everybody that uses this project!

If you donate 1 hour of your time, you can contribute a lot,
because others will do the same, just be part and start with your 1 hour.


Graciliano M. Passos: gmpassos@GitHub.


Apache License – Version 2.0


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