Provide Monaco marker data in a similar way as other integrations

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Monaco marker data provider
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Provider marker data for Monaco models.
Monaco editor supports marker data to highlight parts of a document using squiggly lines. This is analogous to diagnostics in the language server protocol. Monaco editor itself only supports this through the editor.setModelMarkers function. This allows users to set marker data even if a file isn’t open. This is useful for situations where a change in one file may lead to a marker data change in another. However, in many cases models don’t depend on each other to determine marker data. This is where monaco-marker-data-provider comes in. It exposes an API to set model markers using a provider, in a similar fashion as other Monaco providers.


This project has a peer dependency on monaco-editor. It’s recommended to add it explicitly.
npm install monaco-editor monaco-marker-data-provider


import * as monaco from 'monaco-editor';
import { registerMarkerDataProvider } from 'monaco-marker-data-provider';

import { myCustomValidator } from './myCustomValidator';

registerMarkerDataProvider(monaco, 'plaintext', {
  owner: 'my-custom-markers',

  provideMarkerData(model) {
    return myCustomValidator(model.getValue());


registerMarkerDataProvider(monaco, languageId, provider)

This function returns a disposable.


  • monaco: The monaco-editor module instance.
  • languageId (string): The language id to register the provider for.
  • provider (MarkerDataProvider): The object which provides Monaco marker data.



An object with the following properties:
  • owner: A unique string to determine the owner of the marker data. This may be used to retrieve
the marker data using editor.getModelMarkers(owner).
  • provideMarkerData: A function which provides marker data for the given model. It must return
null, undefined, a list of marker data, or a promise that returns those values.
  • doReset: An optional function to perform a reset after a model has been removed.