Lightning Components Developer Guide
Summer '26 (API version 67.0)
Spring '26 (API version 66.0)
Winter '26 (API version 65.0)
Summer '25 (API version 64.0)
Spring '25 (API version 63.0)
Winter '25 (API version 62.0)
Summer '24 (API version 61.0)
Spring '24 (API version 60.0)
Winter '24 (API version 59.0)
Summer '23 (API version 58.0)
Spring '23 (API version 57.0)
Winter '23 (API version 56.0)
Summer '22 (API version 55.0)
Spring '22 (API version 54.0)
Winter '22 (API version 53.0)
Summer '21 (API version 52.0)
Spring '21 (API version 51.0)
Winter '21 (API version 50.0)
Summer '20 (API version 49.0)
Spring '20 (API version 48.0)
Winter '20 (API version 47.0)
Summer '19 (API version 46.0)
Spring '19 (API version 45.0)
Winter '19 (API version 44.0)
Summer '18 (API version 43.0)
Spring '18 (API version 42.0)
Winter '18 (API version 41.0)
Summer '17 (API version 40.0)
Spring '17 (API version 39.0)
Winter '17 (API version 38.0)
Summer '16 (API version 37.0)
Spring '16 (API version 36.0)
Winter '16 (API version 35.0)
Summer '15 (API version 34.0)
Spring '15 (API version 33.0)
Winter '15 (API version 32.0)
JavaScript ES5 Strict Mode Enforcement
Secure Wrappers
eval() Function is Limited by Locker Service
MIME Types Permitted
Access to Supported JavaScript API Framework Methods Only
What Does Locker Service Affect?
Locker Service API Viewer
Disabling Locker Service for a Component
Don’t Mix Component API Versions
Locker Service Disabled for Unsupported Browsers
Freeze JavaScript Prototypes
Newer Version Available
Locker Service Tools
Locker Service tools help you develop more secure code that is compatible and runs
efficiently with Locker Service.
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Locker Service API Viewer
The Locker Service API Viewer shows the DOM APIs exposed by Locker Service versus the standard DOM APIs for the most complex wrappers: SecureDocument, SecureElement, and SecureWindow. -
Locker Console Overview
Use Locker Console to check your JavaScript code’s compatibility with Locker Service, and compare how it runs with Locker Service enabled and disabled. Access Locker Console in the Component Library.