The DevTools Debug console allows you to watch an application's standard output (stdout), evaluate expressions for a paused or running app in debug mode, and analyze inbound and outbound references for objects.

:::note This page is up to date for DevTools 2.23.0. :::

The Debug console is available from the Inspector, Debugger, and Memory views.

The console shows the application's standard output (stdout):

If you click a widget on the Inspector screen, the variable for this widget displays in the Console:

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In the console, you can evaluate expressions for a paused or running application, assuming that you are running your app in debug mode:

To assign an evaluated object to a variable, use $0, $1 (through $5) in the form of var x = $0:

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To drop a variable to the console from a heap snapshot, do the following:

1. Navigate to Devtools > Memory > Diff Snapshots.
2. Record a memory heap snapshot.
3. Click on the context menu [⋮] to view the number of Instances for the desired Class.
4. Select whether you want to store a single instance as a console variable, or whether you want to store all currently alive instances in the app.

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The Console screen displays both live and static inbound and outbound references, as well as field values:

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