# Developer - [JMap NG Developer Manual](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual.md) - [Startup Options](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/startup-options.md) - [Extensions](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/extensions.md) - [Examples](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples.md) - [Start the JMap NG Core library](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/start-the-jmap-ng-core-library.md) - [Start the JMap NG App](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/start-the-jmap-ng-app.md) - [Add a JMap NG App extension](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/add-a-jmap-ng-app-extension.md) - [Toggle a JMap layer visibility](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/toggle-a-jmap-layer-visibility.md) - [Add a layer to display custom data from GeoJSON file](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/add-a-layer-to-display-custom-data-from-geojson-file.md) - [Locate and select features by attribute query](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/locate-and-select-features-by-attribute-query.md) - [Add an event on move end](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/add-an-event-on-move-end.md) - [Add attributions on the map](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/add-attributions-on-the-map.md) - [Locate and select feature by id](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/locate-and-select-feature-by-id.md) - [Locate and select feature(s) by location](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/locate-and-select-feature-s-by-location.md) - [Custom mouseover on a layer](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/custom-mouseover-on-a-layer.md) - [Create a custom form in a div](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/examples/create-a-custom-form-in-a-div.md) - [Changelog](https://docs-jmapserver-lima.k2geospatial.com/e/developer/jmap-ng-developer-manual/changelog.md) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs-jmapserver-lima.k2geospatial.com/e/developer.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.