--- title: Markdown output category: features --- The {@link module:markdown-gfm/gfmdataprocessor~GFMDataProcessor} class implements a {@link module:engine/dataprocessor/dataprocessor~DataProcessor data processor} which changes CKEditor output from HTML to Markdown. This means that you can {@link module:core/editor/utils/dataapimixin~DataApi#setData set} or {@link module:core/editor/utils/dataapimixin~DataApi#getData get} data from the editor in the Markdown format: ```js editor.getData(); // -> 'This is [CKEditor 5](https://ckeditor.com).' editor.setData( 'This is **bold**.' ); ``` "GFM" stands for "GitHub Flavored Markdown" — a Markdown dialect used by [GitHub](https://github.com). Markdown lacks any formal specification and has many dialects, often incompatible with each other. When converting the output produced by this data processor make sure to use a compatible Markdown to HTML converter (e.g. the [marked](https://www.npmjs.com/package/marked) library). **This feature is experimental!** While the CKEditor 5 architecture supports changing the data format, in most scenarios we do recommend sticking to the default format which is HTML (supported by the {@link module:engine/dataprocessor/htmldataprocessor~HtmlDataProcessor}). HTML remains [the best standard for rich-text data](https://medium.com/content-uneditable/a-standard-for-rich-text-data-4b3a507af552). And please do remember – using Markdown [does not automatically make your application/website secure](https://github.com/ckeditor/ckeditor5-markdown-gfm/issues/16#issuecomment-375752994). ## Installation To enable this data processor in your editor install the [`@ckeditor/ckeditor5-markdown-gfm`](https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm) package: ``` npm install --save @ckeditor/ckeditor5-markdown-gfm ``` Then, you can enable this data processor by using {@link module:markdown-gfm/markdown~Markdown} plugin which will change default {@link module:engine/dataprocessor/dataprocessor~DataProcessor data processor} with {@link module:markdown-gfm/gfmdataprocessor~GFMDataProcessor}: ```js import ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor'; import Essentials from '@ckeditor/ckeditor5-essentials/src/essentials'; import Bold from '@ckeditor/ckeditor5-basic-styles/src/bold'; import Italic from '@ckeditor/ckeditor5-basic-styles/src/italic'; // ... import Markdown from '@ckeditor/ckeditor5-markdown-gfm/src/markdown'; ClassicEditor .create( document.querySelector( '#snippet-markdown' ), { plugins: [ Markdown, Essentials, Bold, Italic, // ... ], // ... } ) .then( ... ) .catch( ... ); ``` ## Demo {@snippet features/markdown} ## Contribute The source code of this feature is available on GitHub in https://github.com/ckeditor/ckeditor5/tree/master/packages/ckeditor5-markdown-gfm.