Types

Each input and output in a node has a specific type that defines the kind of data it can handle.

The most common type you’ll encounter is Text, as most flows involve working with text data.

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Types You’ll Encounter

• Text: A single piece of text.
• List of text: A collection of multiple text items.
• List of List of text: A nested collection of text lists.

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Type Matching

For a flow to work correctly, the output type of one node must match the input type of the next node. If the types don’t match, the flow will fail due to a type mismatch error.

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Common Type Mismatch Errors

The most frequent issue is mismatching:

• Text → List of text
• List of text → Text

For example, the Gmail Reader node outputs a List of text, where each item in the list contains the content of an individual email:

If you try to connect this List of text to a node expecting a single Text, you’ll see an error.

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How to Fix Type Mismatch Errors

1. Use Loop Mode:
   Most nodes, like the Gmail Reader or Ask AI, support loop mode, which allows them to process a list of items one at a time.
   Enable loop mode in the node to handle each item in the list individually.

2. Use List Operations:
   If you need to adjust the data to match types, use the List Operations nodes. These include:

   • Combine Lists: Merge multiple lists into one.
   • Flatten List of Lists: Simplify a nested list into a single list.
   • Get List Item: Extract a specific item from a list.
   • Join List Items: Combine all items in a list into a single text block.

   Refer to the list operators documentation for more details on these nodes.