Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Enable Dev Hub Features in Your Org
Project Setup
Authorization
Metadata Coverage
Scratch Orgs
Sandboxes
Track Changes Between Your Project and Org
Development
Develop Against Any Org
Assign a Permission Set
Ways to Add Data to Your Org
Create Lightning Apps and Aura Components
Create Lightning Web Components
Create an Apex Class
Create an Apex Trigger
Run Apex Tests
Debug Apex
Generate and View Apex Debug Logs
Build and Release Your App
First-Generation Managed Packages
Second-Generation Managed Packages
Unlocked Packages
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Generate and View Apex Debug Logs

Apex debug logs can record database operations, system processes, and errors that occur when executing a transaction or running unit tests in any authenticated org. Enable the Debug Log in Salesforce Extensions for VS Code, then view the logs with VS Code or Salesforce CLI.
  1. In Salesforce Extensions for VS Code, prepare the org to generate logs and configure the debugger.
    1. Log in to the org.
    2. For Replay Debugger, run SFDX: Turn on Apex Debug Log for Replay Debugger.
    3. Create a launch configuration file for Replay Debugger or Interactive Debugger.
  2. After you run tests, get a list of the debug logs. 
    1sfdx force:apex:log:list
2
3APPLICATION DURATION (MS) ID       LOCATION  SIZE (B) LOG USER  OPERATION       REQUEST START TIME   STATUS
4─────────── ───────────── ───────  ───────── ──────── ───────── ─────────────── ─────── ───────────  ───────
5Unknown     1143          07L9Axx  SystemLog 23900    User User ApexTestHandler Api     2017-09-05x  Success
  3. View a debug log by passing its ID to the force:apex:log:get command. 
    1sfdx force:apex:log:get --logid 07L9A000000aBYGUA2
2
338.0 APEX_CODE,FINEST;APEX_PROFILING,INFO;CALLOUT,INFO;DB,INFO;SYSTEM,DEBUG;VALIDATION,INFO;VISUALFORCE,INFO;WAVE,INFO;WORKFLOW,INFO
415:58:57.3 (3717091)|USER_INFO|[EXTERNAL]|0059A000000TwPM|test-ktjauhgzinnp@example.com|Pacific Standard Time|GMT-07:00
515:58:57.3 (3888677)|EXECUTION_STARTED
615:58:57.3 (3924515)|CODE_UNIT_STARTED|[EXTERNAL]|01p9A000000FmMN|RejectDuplicateFavoriteTest.acceptNonDuplicate()
715:58:57.3 (5372873)|HEAP_ALLOCATE|[72]|Bytes:3
8...