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
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
Testing
View Apex Debug Logs
Apex Debugger
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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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 your scratch org. You can use the Salesforce CLI to view the debug logs.
  1. Open your scratch org by running force:org:open. If you have not set a default username, specify the scratch org’s username or alias with the -u parameter.
  2. Under the quick access menu (Lightning Experience) or your name (Salesforce Classic), click Developer Console. Opening the Developer Console starts a listener that is required by the force:apex:log commands.
  3. If necessary, run Apex tests to generate some debug logs. 
    1sfdx force:apex:test:run
  4. 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
  5. 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...