Document Editor component is used to create, edit, view, and print Word documents in web applications. All the user interactions and editing operations that run purely in the client-side provides much faster editing experience to the users.
Overview: https://ej2.syncfusion.com/angular/documentation/document-editor/
Document editor requires server side interaction for following action:
Open file formats other than SFDT
Paste with formatting
Restrict editing
Spellcheck
Save as file formats other than SFDT and DOCX
https://ej2.syncfusion.com/documentation/document-editor/#supported-platforms-for-server-side-dependencies
You can deploy web APIs for server-side dependencies of Document Editor component in the following platforms.
ASP.NET Core
ASP.NET MVC
Java
Documentation link:https://ej2.syncfusion.com/react/documentation/document-editor/web-services/
Other than above, remaining functionalities will work without server side interaction.