Increase your Debugging Skills – Salesforce Apex Debug Logs

Author: Bruce Tollefson Published: January 18, 2022; Modified: January 18, 2022

Debugging Apex in Salesforce Apex logs can be difficult. If you have downloaded an apex log and tried to find the issue it can be a big chore. With Visual Studio Code and the Apex Replay Debugger extension debugging has become much easier. This article won’t be going through Apex Replay Debugger as trailhead has a very good module on it. However as good as the replay debugger is it is only as good as the Apex log itself. If you are trying to view a large string, object, list, etc.. the results may be truncated. Such as below:

Debug Apex Logs

Knowing that the Apex Replay Debugger will not display a large list the list could be debugged such as below where the logs show more detail, however still truncate at some point.

The list could go into a for loop and debug each list item such as below

Or the list could be debugged with the following:


The above line of code will display the full list, plus additional metadata not shown in the for loop. This method is also a great way to debug other large objects. As an example, if you are making a REST callout and don’t know the full payload.

There are multiple ways were using the Apex Replay Debugger along with System.debug() can be used with an Apex Log to create a full picture of what is happening within a transaction. However my preferred approach is to use System.debug(JSON.serializePretty(object)); to debug an Apex log.

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