ServiceNow Flow Designer Interview Questions 2025

When to use Flow Designer vs Workflow?

Workflow can be used in following cases:
1. If the process requires complicated or scripted logic, it can be written in a Workflow.
2. Changing logic already developed using Workflows.
3. SLA timer is required.
4. Steps required do not exist yet in Flow Designer and require unsupported protocols.

Use Flow Designer when:
1. Process owners need to use natural language and low code way to automate approvals, task, notifications and record operations.
2. New logic needs to be developed and it has not been created in workflow.
3. Business logic needs to use the library of reusable actions across multiple flows.

What are the benefits of flow designer?

1. Provides a list of reusable flow components in the base system and helps reduce development cost.
2. Reduces upgrade costs, with upgrade-safe platform logic, replacing complex custom scripts.
3. Develop, share, and reuse your custom flow components with other flow designers.
4. Integrate with external instances and third-party applications with the use of IntegrationHub.
5. You do not have to script. Natural language descriptions are used to help non-technical users to understand triggers, actions, inputs and outputs.
6. Combines multiple platform automation capabilities, configuration, and runtime information so process owners and developers can create, operate, and troubleshoot flows from a single interface.

What are the different types of flow trigger?

1) Record Triggers: Starts a flow when a record is created or updated

This trigger has three different options:
i) Created: Starts a flow when a record is created in a specific table.
ii) Updated: Starts a flow when a record is updated in a specific table.
iii) Created or Updated: Starts a flow when a record is either created or updated in a specific table.

2) Rest Triggers: This is used to start a flow after a specific REST API request.

3) Scheduled Triggers: This is used to start a flow after a specific date and time or repeatedly at scheduled intervals. Scheduled triggers use the instance timezone to determine when to start a flow.

4) Application Triggers: This is used to start a flow when application-specific conditions are met. This has three different sub trigger options as below :
i) MetricBase : Starts a flow when a MetricBase trigger is met. Requires the MetricBase application.
ii) Service Catalog : Starts a flow from a Service Catalog item request.
iii) SLA Task : Starts a flow from an SLA Definition record.

5) Inbound email triggers: Start a flow when instance receives an email.

How can you execute activites/action/task parallel in flow designer?

We can use flow logic "Do the following in parallel" this lets us execute multiple set of flow actions parallely.

How data is shared between two activities in Flow Designer?

We can use flow variables for passing values from one flow action to another in Flow designer. Also, we have Data panel and data pill picker to access global variables which are available at flow level.

How to call subflow/flow from client script?

ServiceNow has provided "FlowAPI" class to call Flow/Subflow/Actions by using scriping. However, this can only be called from Server side scriping. So, when we want it to be called from Client side, we can use GlideAjax to invoke server side script which will trigger Flow/Subflow/Actions.

Example script to call Flow from server side scripting:

How to trigger integration by using Flow Designer?

We have in built "Rest Step" in Flow designer to trigger integration. However, this step is not available in the base system and requires the ServiceNow Integration Hub subscription. After the required plugin is activated, the step is visible under Integrations.

Click here for more details about Rest Step in Flow Designer

What are the different stages of Flow Execution?

During flow execution, each stage can be in one of five states.
1. Pending - This stage has not yet started.
2. In progress - This stage is executing.
3. Skipped - This stage was skipped and did not run. Typically, this state is reached when a conditional flow logic block is not executed.
4. Complete - This stage is complete.
5. Error - This stage has reached an error condition.

How to write advanced server-side scripting in Flow Designer?

To write advanced server-side scripting in Flow Designer, we can create custom Flow Actions.

These actions enable us to write our own scripting logic, which can then be integrated into the main flow. This provides flexibility to implement complex business logic and enhance the functionality of your flows.


Prepared and confident for your interview?

Practice makes perfect! Test your skills with our virtual interview practice buddy and ensure you're fully ready for your upcoming interview.

🎯 Start Practicing

Real Interview Questions & Answers

Questions shared by ServiceNow professionals and reviewed for clarity, relevance, and interview usefulness.

Ravindra V 2026-04-21 06:37:25

Types of action in flow designer?What actions you have created until now?

0 Helpfuls


Mohammed Shakeel 2025-11-01 01:46:59

Exact difference between a Flow and Workflow? Is workflow synchronous or asynchronous?

0 Helpfuls


Ajay 2025-05-27 06:12:43

How to add Input and Output in subflow?


Rajesh Gillerla 2026-01-07 02:47:06
While Creating subflow it self it will ask input there we can define input and Output we can pass information to Subflow output in Assign subflow Output Flow logic
0 Helpfuls
0 Helpfuls


Heisenberg 2024-12-24 13:29:43

What is integration hub? Have you utilized integration hub in any of your projects?


Rajesh Gillerla 2026-01-07 02:52:33
Intigration Hub is comes in flow desinger let say it's a Low code platform used to integrate two application with each other with spoke, Example : Let say we want to integrate servicenow with third party Tools like Jira, Azure in thise we can install those spoke it will give Action and Subflow with realated to that Spoke using this without Code we will integrate
0 Helpfuls
0 Helpfuls


Speedy 2024-12-24 13:27:46

What is a subflow and why do we need it?


Priyanka 2025-07-07 02:10:42
A subflow is a reusable sequence of actions or a self-contained flow that can be referenced and executed within a larger flow. Need of Subflow: Subflows help you reuse the same steps in different flows, so you don’t have to repeat the same logic everywhere. They make your flows more organized and easier to manage by breaking big processes into smaller, simple parts. This saves time and effort, makes updates easier, and allows you to adjust the subflow for different needs.
0 Helpfuls
0 Helpfuls


Akash 2024-07-06 09:44:52

How to add role to new user using Flow designer


Hales 2025-07-30 21:31:47
You have to create a record in sys_user_has_role table by using create record action.
0 Helpfuls
0 Helpfuls








🚀 Power Up Your ServiceNow Career

Join a growing community of smart ServiceNow professionals to stay ahead in interviews, sharpen your development skills, and accelerate your career.

Comments

Mudit 2024-09-09 07:21:06
to fetch catalog variables you can use get catalog variable action or you can use toggle script -fd_trigger.(table_name).current.(variable_name)


XYZ 2024-07-08 02:58:36
To get the value of any variable (from the Requested Item / catalog item variables), you can dot-walk to retrieve it. To send the value, transformation, etc. back to the Flow, you simply add a return statement in your script. This will set the short description to the value in your return statement


ShriKumar 2024-06-22 04:33:45
Interviewer asked how you fetch variables from flow designer and what to you do in action and how will you trigger flow designer.