Best practices for handling errors in Flow Designer custom action

[HamedTahaH]

Hi everyone,
What are the recommended best practices for implementing error handling in custom Actions within Flow Designer?
Should we rely mainly on Error Evaluation or Script steps?
Thanks in advance

[TejasN505724351]

Hi,

Great question—error handling in Flow Designer Actions is very important for building reliable and maintainable automation.

The recommended approach is to use a combination of Error Evaluation and Script steps, rather than relying on just one.

Error Evaluation should be your primary method for handling expected errors. It allows you to gracefully manage known failure scenarios (like missing data, invalid inputs, or failed lookups) without breaking the entire flow. This keeps your flows clean, readable, and aligned with low-code best practices.

Script steps, on the other hand, are useful for handling more complex or edge-case scenarios where Error Evaluation may not be sufficient. For example, when you need custom logic, detailed validation, or try-catch handling for integrations.

In short, prefer Error Evaluation for simplicity and maintainability, and use Script steps selectively for complex logic.

Hope this helps!

[Aditya_hublikar]

Hello @HamedTahaH ,

Recommended practice is to use a combination of Error Evaluation and Script steps in custom Flow Designer Actions.

Error Evaluation is ideal for handling predictable or business-level failures such as validation checks, empty inputs, or response status conditions. It keeps the Action declarative, readable, and easier to maintain.

Script steps are better suited for complex scenarios where you need try/catch logic, integration response parsing, custom validations, or detailed logging.

Best approach: handle expected conditions using Error Evaluation and reserve Script steps for advanced or technical error handling, while also returning meaningful outputs so the calling Flow can respond appropriately.

If this helps you then mark it as helpful and accept as solution.

Regards,

Aditya,

Technical Consultant

[Ankur Bawiskar]

@HamedTahaH 

with the flow action you can define how and what you are treating as error.

see this detailed blog

Flow and Action Error Handling Overview: Why and how to test for errors - Workflow Automation CoE 

💡 If my response helped, please mark it as correct ✅ and close the thread 🔒— this helps future readers find the solution faster! 🙏

[yashkamde]

Hello @HamedTahaH ,

Refer this :

Error Handling in Actions in Flow Designer 
Error Handling for Flow Designer Action is not setting step status correctly for a REST request 

If my response helped mark as helpful and accept the solution..