Using CKEditor 5 with .NET and CDN

As a pure JavaScript/TypeScript library, CKEditor 5 will work inside any environment that supports such components. While we do not offer official integrations for any non-JavaScript frameworks, you can include a custom configuration of CKEditor 5 in a non-JS framework of your choice, for example, Microsoft’s .NET.

# Setting up the project

For the purpose of this guide, we will use a basic ASP.NET Core project created with dotnet new webapp. You can refer to the ASP.NET Core documentation to learn how to set up a project in the framework.

# Using from CDN

The folder structure of the created project should resemble the one below:

├── bin
├── obj
├── Pages
│   ├── Index.cshtml
│   └── ...
├── Properties
├── wwwroot
│   ├── css
│   ├── js
│   ├── lib
│   └── favicon.ico
├── appsettings.Development.json
├── appsettings.json
└── ...

First, modify the Index.cshtml file in the Pages directory to include the CKEditor 5 scripts and styles. All necessary scripts and links are in the HTML snippet below. You can copy and paste them into your template. Open-source and premium features are in separate files, so there are different tags for both types of plugins. Add tags for premium features only if you use them.

@page
@model IndexModel
@{
    ViewData["Title"] = "Home page";
}

<div class="text-center">
    <link rel="stylesheet" href="https://cdn.ckeditor.com/ckeditor5/44.0.0/ckeditor5.css" />
    <script src="https://cdn.ckeditor.com/ckeditor5/44.0.0/ckeditor5.umd.js"></script>
    <!-- Add if you use premium features. -->
    <link rel="stylesheet" href="https://cdn.ckeditor.com/ckeditor5-premium-features/44.0.0/ckeditor5-premium-features.css" />
    <script src="https://cdn.ckeditor.com/ckeditor5-premium-features/44.0.0/ckeditor5-premium-features.umd.js"></script>
    <!--  -->
    <style>
    .main-container {
        width: 795px;
        margin-left: auto;
        margin-right: auto;
    }
    </style>

    <div class="main-container">
        <div id="editor">
            <p>Hello from CKEditor 5!</p>
        </div>
    </div>
</div>

Both attached earlier scripts expose global variables named CKEDITOR and CKEDITOR_PREMIUM_FEATURES. You can use them to access the editor class and plugins. In our example, we use object destructuring (JavaScript feature) to access the editor class from the open-source global variable with a basic set of plugins. You can access premium plugins from the other variable the same way. Then, we pass the whole configuration to the create() method. Be aware that you need a proper license key to use premium features.

const {
    ClassicEditor,
    Essentials,
    Bold,
    Italic,
    Font,
    Paragraph
} = CKEDITOR;
const { FormatPainter } = CKEDITOR_PREMIUM_FEATURES;

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        licenseKey: '<YOUR_LICENSE_KEY>',
        plugins: [ Essentials, Bold, Italic, Font, Paragraph, FormatPainter ],
        toolbar: [
            'undo', 'redo', '|', 'bold', 'italic', '|',
            'fontSize', 'fontFamily', 'fontColor', 'fontBackgroundColor', '|',
            'formatPainter'
        ]
    } )
    .then( /* ... */ )
    .catch( /* ... */ );

Now, we need to put our script in the previous template. We put it under the <div> element, so the editor can attach to it. Your final template should look like this:

@page
@model IndexModel
@{
    ViewData["Title"] = "Home page";
}

<div class="text-center">
    <link rel="stylesheet" href="https://cdn.ckeditor.com/ckeditor5/44.0.0/ckeditor5.css" />
    <script src="https://cdn.ckeditor.com/ckeditor5/44.0.0/ckeditor5.umd.js"></script>
    <!-- Add if you use premium features. -->
    <link rel="stylesheet" href="https://cdn.ckeditor.com/ckeditor5-premium-features/44.0.0/ckeditor5-premium-features.css" />
    <script src="https://cdn.ckeditor.com/ckeditor5-premium-features/44.0.0/ckeditor5-premium-features.umd.js"></script>
    <!--  -->
    <style>
    .main-container {
        width: 795px;
        margin-left: auto;
        margin-right: auto;
    }
    </style>

    <div class="main-container">
        <div id="editor">
            <p>Hello from CKEditor 5!</p>
        </div>
    </div>

    <script>
        const {
            ClassicEditor,
            Essentials,
            Bold,
            Italic,
            Font,
            Paragraph
        } = CKEDITOR;
        const { FormatPainter } = CKEDITOR_PREMIUM_FEATURES;

        ClassicEditor
            .create( document.querySelector( '#editor' ), {
                licenseKey: '<YOUR_LICENSE_KEY>',
                plugins: [ Essentials, Bold, Italic, Font, Paragraph, FormatPainter ],
                toolbar: [
                    'undo', 'redo', '|', 'bold', 'italic', '|',
                    'fontSize', 'fontFamily', 'fontColor', 'fontBackgroundColor', '|',
                    'formatPainter'
                ]
            } )
            .then( /* ... */ )
            .catch( /* ... */ );
    </script>
</div>

Finally, in the root directory of your .NET project, run dotnet watch run to see the app in action.