⚠️ Updated December 2025: This project was originally created 4-5 years ago by Michael Hoffer. It has been updated by Chris Bunting to use Monaco Editor 0.52.0 with modern features. This update has not yet been fully tested.
A powerful JavaFX wrapper for the Monaco Editor — the same editor that powers VS Code.
 |
 |
| Code Editor with minimap, syntax highlighting, bracket colorization | Diff Editor with side-by-side comparison |
Screenshots from the included demo app (mvn javafx:run)
This project was created by Michael Hoffer (@miaborgo).
- Original Repository: github.com/miho/MonacoFX
- Website: michaelhoffer.de
| Feature | Description |
|---|---|
| Monaco 0.52.0 | Latest stable Monaco Editor with AMD loader |
| Syntax Highlighting | 50+ languages built-in |
| Minimap | Code overview with section headers |
| Bracket Pair Colorization | Colored matching brackets |
| Sticky Scroll | Keep scope headers visible |
| Diff Editor | Side-by-side and inline diff views |
| Multiple Themes | vs-dark, vs-light, hc-black |
| Feature | Class | Description |
|---|---|---|
| Editor Options | EditorOptions |
Configure minimap, fonts, scrolling, etc. |
| Decorations | DecorationsService |
Add error underlines, highlights |
| Markers | MarkersService |
Linting diagnostics (errors, warnings) |
| Hover | HoverProvider |
Show tooltips on hover |
| Completion | CompletionItemProvider |
Custom IntelliSense |
| Inline Completion | InlineCompletionProvider |
AI ghost text suggestions |
| Go to Definition | DefinitionProvider |
Ctrl+Click navigation |
| Color Picker | DocumentColorProvider |
Color swatches for CSS |
| Find/Replace | FindReplaceService |
Search operations |
| Cursor | CursorService |
Position and selection |
- JDK 17+
- Maven 3.8+
<dependency>
<groupId>eu.mihosoft.monacofx</groupId>
<artifactId>monacofx</artifactId>
<version>0.2.0</version>
</dependency>import eu.mihosoft.monacofx.*;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class App extends Application {
@Override
public void start(Stage stage) {
MonacoFX editor = new MonacoFX();
// Set content and language
editor.getEditor().getDocument().setText("console.log('Hello, Monaco!');");
editor.getEditor().setCurrentLanguage("javascript");
editor.getEditor().setCurrentTheme("vs-dark");
// Apply modern options
editor.getEditor().setOptions(EditorOptions.builder()
.minimap(true)
.stickyScroll(true)
.bracketPairColorization(true)
.build()
);
stage.setScene(new Scene(new StackPane(editor), 800, 600));
stage.show();
}
}DiffEditorFX diffEditor = new DiffEditorFX();
diffEditor.getDiffEditor().setOriginal("Hello World", "text");
diffEditor.getDiffEditor().setModified("Hello Monaco World", "text");
diffEditor.getDiffEditor().setInlineView(false); // side-by-sideeditor.getDecorationsService().addDecorations(
Decoration.builder()
.range(5, 1, 5, 20)
.className("squiggly-error")
.hoverMessage("Undefined variable")
.build()
);editor.getMarkersService().setMarkers("myLinter",
Marker.error("Syntax error", 10, 5, 10, 15),
Marker.warning("Unused import", 3, 1, 3, 25)
);editor.setCompletionProvider("java", (text, position, trigger) -> {
return List.of(
CompletionItem.builder()
.label("System.out.println")
.kind(CompletionItemKind.METHOD)
.insertText("System.out.println($1);")
.build()
);
});editor.setDefinitionProvider("java", (text, position, word) -> {
// Return location of symbol definition
return List.of(new Location(new Range(100, 1, 100, 20)));
});# Compile
mvn clean compile
# Run demo app
mvn javafx:run
# Package JAR
mvn packageMIT License - see LICENSE
- Michael Hoffer — Original MonacoFX creator
- Microsoft — Monaco Editor