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---
layout: default
title: Task List Extension
description: The TaskListExtension adds support for GFM-style task lists
---
# Task List Extension
_(Note: this extension is included by default within [the GFM extension](/2.2/extensions/github-flavored-markdown/))_
This extension adds support for [GFM-style task lists](https://github.github.com/gfm/#task-list-items-extension-).
## Installation
This extension is bundled with `league/commonmark`. This library can be installed via Composer:
```bash
composer require league/commonmark
```
See the [installation](/2.2/installation/) section for more details.
## Usage
Configure your `Environment` as usual and simply add the `TaskListExtension` provided by this package:
```php
use League\CommonMark\Environment\Environment;
use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
use League\CommonMark\Extension\TaskList\TaskListExtension;
use League\CommonMark\MarkdownConverter;
// Define your configuration, if needed
$config = [];
// Configure the Environment with all the CommonMark parsers/renderers
$environment = new Environment($config);
$environment->addExtension(new CommonMarkCoreExtension());
// Add this extension
$environment->addExtension(new TaskListExtension());
// Instantiate the converter engine and start converting some Markdown!
$converter = new MarkdownConverter($environment);
$markdown = <<<EOT
- [x] Install this extension
- [ ] ???
- [ ] Profit!
EOT;
echo $converter->convert($markdown);
```
Please note that this extension doesn't provide any JavaScript functionality to handle people checking and unchecking boxes - you'll need to implement that yourself if needed.
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