Code Execution Node | Vellum

Code Execution Nodes

The Code Execution Node empowers you to include custom logic defined directly in the workflow. You can even import custom public packages within the node’s logic. We support the following languages:

Python
TypeScript

Code Execution Node

Tip: Outputting Arrays (Strings)

Set your output type to JSON when returning string arrays from Code Execution Nodes, or you’ll get the following error: Failed to execute node Code Execution Node: Mismatched output type. Output[0]: Expected to deserialize a 'dict', got 'str'

Tip: Outputting Arrays (Function Calls)

The main scenario in which you’d use Array as your Code Execution Node output type is when you’re processing Prompt Execution Node outputs with Function Calls.

For more on that, see Quirks and Tips for Handling Functions