---
title: Flow debugger
description: Debug flows and subflows from a dedicated Workflow Studio tab. Set breakpoints and step through a paused flow to review configuration and runtime values.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/australia/build-workflows/workflow-studio/flow-debugger.html
release: australia
product: Workflow Studio
classification: workflow-studio
topic_type: concept
last_updated: "2026-03-12"
reading_time_minutes: 1
breadcrumb: [Flows, Flows, subflows, and actions, Workflow Studio, Build workflows]
---

# Flow debugger

Debug flows and subflows from a dedicated Workflow Studio tab. Set breakpoints and step through a paused flow to review configuration and runtime values.

The flow debugger enables you to perform these actions.

-   Debug a flow or subflow from a dedicated Workflow Studio tab
-   Set and remove breakpoints.
-   Pause a flow or subflow at a breakpoint.
-   Review the configuration and runtime values of each step of a flow or subflow.
-   Step through a flow or subflow line-by-line.
-   Step into and out of subflows.
-   Step over the next breakpoint.
-   Skip over all remaining breakpoints.
-   Resume running a paused flow or subflow.

## Debug mode

To debug a flow, open the flow from the Workflow Studio home page and select **Test** > **Debug**.

\[Omitted image "flow-debugger-entry.png"\] Alt text: Entry point for the debug mode.

## Debug mode tabs

A Workflow Studio debug mode tab displays flow execution details in a debugging view.

\[Omitted image "example-flow-debugger-flow.png"\] Alt text: Controls available on a debug mode tab.

A Workflow Studio debugging view tab consists of these elements.

-   **1. Debug mode label**

    Confirm that you are debugging the current flow or subflow.

-   **2. Debug controls**

    Select a debug control to step through a flow or subflow line-by-line.

    -   Resume a flow or subflow to run it until the next breakpoint.
    -   Step over a breakpoint to run the flow or subflow without pausing at the next breakpoint.
    -   Step into a subflow to debug the subflow in a separate tab.
    -   Step out of subflow to return to the debug tab of the parent flow.
    -   Skip all breakpoints to resume running the flow or subflow without pausing at any breakpoints.
-   **3. Debugging state**

    See which step of the flow or subflow you are currently debugging.

-   **4. Breakpoints**

    Set a breakpoint to pause the flow at this step. Remove a breakpoint to run the flow without pausing on a step.

-   **5. Runtime and configuration values**

    View the runtime and configuration values generated by the current step. Use these values to determine if the flow generates the data you expect it to.


\[Omitted image "example-flow-debugger-step-into-subflow.png"\] Alt text: Subflow stepped into from main flow

When you step into a subflow, Workflow Studio displays a separate tab to debug the subflow.

-   **6. Subflow debug tab**

    Step into a subflow to debug it in a separate tab.