Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
Styling Apps
Developing Secure Code
What is Locker Service?
JavaScript ES5 Strict Mode Enforcement
DOM Access Containment
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 Tools
Locker Service API Viewer
Locker Console Overview
Evaluate JavaScript Code Compatibility with Locker Service
Benchmark Locker Service Effect on JavaScript Code
Disabling Locker Service for a Component
Don’t Mix Component API Versions
Locker Service Disabled for Unsupported Browsers
Content Security Policy Overview
Freeze JavaScript Prototypes
Using JavaScript
Using Apex
Lightning Data Service
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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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.

Locker Console enables you to quickly evaluate JavaScript code for issues or benchmark code, without requiring you to create an app to test your component. You can evaluate only JavaScript code in Locker Console. You can't evaluate a complete component bundle or component markup.

Here's an overview of the user interface of the Locker Console tool.

Locker Console functionality
Code Console (1)
Paste or type your JavaScript code here to evaluate or benchmark it.
Toggles (2)
  • Enable or disable Locker Service.
  • Enable or disable Strict CSP.
Actions (3)
  • Click Evaluate to run the code that’s displayed in the code console.
  • Click Benchmark to run your code with and without Locker Service and view relative performance metrics.
  • Click Clear Results to clear all the displayed results.