# Document Editing Sample
This is an example that shows you how to create a command which makes changes to the document in the active editor.
## Demo
## VS Code API
### `vscode` module
- [`commands.registerCommand`](https://code.visualstudio.com/api/references/vscode-api#commands.registerCommand) - [`window.activeTextEditor`](https://code.visualstudio.com/api/references/vscode-api#window.activeTextEditor) - [`TextDocument.getText`](https://code.visualstudio.com/api/references/vscode-api#TextDocument.getText) - [`TextEditor.edit`](https://code.visualstudio.com/api/references/vscode-api#TextEditor.edit) - [`TextEditorEdit`](https://code.visualstudio.com/api/references/vscode-api#TextEditorEdit)
### Contribution Points
- [`contributes.commands`](https://code.visualstudio.com/api/references/contribution-points#contributes.commands)
## Running the Sample
- Run `npm install` in terminal to install dependencies - Run the `Run Extension` target in the Debug View. This will: - Start a task `npm: watch` to compile the code - Run the extension in a new VS Code window