How to Ensure Nested Language Loops Process Correctly in a Client Type Workflow?

Below is a couple of suggestions that have worked for others when running nested loops in n8n:

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1. Reattach the Language Array to Each Outer Loop Item

When you have an outer loop (processing client types) and an inner loop (processing languages), make sure each outer loop item carries its own fresh copy of the languages to be processed. Rather than trying to make the language values unique using a unique suffix (which can cause the language node to “think” it’s already processed the data), you can use a Set node (or similar) immediately after your outer loop node to reattach the languages array into each client type item. For example:

JSONCopied
{
  "clientType": "Client A",
  "languages": ["en", "es", "de"]
}

Now, when you send this item into your inner loop, you can iterate over the languages without worrying about leftover state from previous iterations.

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2. Use the “Loop Over Items” Node for Each Language Array Independently

After ensuring that each outer loop item carries its own languages array, you can connect that field to a separate Loop Over Items node. In the configuration of that node, use an expression such as:

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{{ $json.languages }}

This approach guarantees that for every client type processed, the inner loop node receives a new list of languages to iterate over.

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Alternative Approach: Restructure Your Workflow

Sometimes, problems in nested-loop scenarios arise from the way nodes “remember” processing results. An alternative approach is to:

1. Start with a Set (or Code) node that creates a structured output for each client type, including its associated language list.
2. Use the outer Loop Over Items node to iterate over each client item.
3. Inside each outer loop iteration, branch off into a dedicated inner Loop Over Items node that pulls from the newly attached "languages" field.

This method avoids relying on unique identifiers (which might work the first time only) and instead creates a clear separation of data per iteration.

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Why This Works

n8n iterates over items automatically—each node processes the available items from its previous node. By ensuring that the language array is injected into every client type item, you reset the context for the inner loop for every iteration. This avoids the situation where the inner loop thinks the languages have already been processed (a side effect of the unique identifier approach).

For more details on looping and setting up loops in n8n, you can refer to the official documentation on Looping in n8n.

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I hope these suggestions help you structure your workflow so that the inner loop properly processes all languages for each client type iteration!