# APIs for visualization extensions

Qlik Sense comes with a number of client-side APIs that can be used for building visualization extensions.

Client-side APIs

| API name | API type |
| --- | --- |
| [Engine API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/EngineJSONAPI/Content/introduction.htm) | JSON RPC |
| [Extension API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/extensions-api-reference.htm) | JavaScript library |
| [Backend API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/backend-api-reference.htm) | JavaScript library |
| [Root API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/qlik-interface-interface.htm) | JavaScript library |
| [App API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/qlik-app-interface.htm) | JavaScript library |
| [Bookmark API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/qlik-bookmark-interface.htm) | JavaScript library |
| [Field API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/qlik-field-interface.htm) | JavaScript library |
| [Global API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/qlik-global-interface.htm) | JavaScript library |
| [Table API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/TableAPI/qlik-table-interface.htm) | JavaScript library |
| [Navigation API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/NavigationAPI/NavigationAPI.htm) | JavaScript library |
| [Selection API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/SelectionAPI/qlik-selectionState-interface.htm) | JavaScript library |
| [Variable API](https://help.qlik.com/en-US/sense-developer/May2026/Subsystems/APIs/Content/Sense_ClientAPIs/CapabilityAPIs/qlik-variable-interface.htm) | JavaScript library |