Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
Debugging
Enable Debug Mode for Lightning Components
Salesforce Lightning Inspector Chrome Extension
Log Messages
Fixing Performance Warnings
Reference
PDF

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Log Messages

To help debug your client-side code, you can write output to the JavaScript console of a web browser using console.log() if your browser supports it..

For instructions on using the JavaScript console, refer to the instructions for your web browser.