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Loop

The Loop node iterates over an array, executing downstream nodes for each item.

The Loop node iterates over an array, executing downstream nodes for each item. Requires a back-connection from the last node in the iteration body to advance.

Overview

PropertyValue
Inputs2 (default + loop back)
Outputs2 (loop, done)
Output$nodeLabel.item, $nodeLabel.index, $nodeLabel.total, $nodeLabel.isFirst, $nodeLabel.isLast

Parameters

ParameterTypeDescription
labelstringNode identifier (camelCase)
arrayExpressionexpressionExpression that resolves to an array (e.g. $input.items)

Edge Handles

  • Source loop – Connects to nodes that process each item (runs per iteration)
  • Source done – Connects to nodes that run after all iterations complete
  • Target default – Receives initial data containing the array
  • Target loop – Receives back-connection from the last iteration body node

Loop Context (in iteration body)

  • $loopNode.item – Current item
  • $loopNode.index – 0-based index
  • $loopNode.total – Total items
  • $loopNode.isFirst – Boolean
  • $loopNode.isLast – Boolean

Critical Rules

  1. Back-connection required: The last node in the iteration body MUST connect back to the loop's loop input handle.
  2. No output in loop body: Output nodes are forbidden inside the loop body. Use Set or Variable for intermediate results.
  3. No automatic results: The loop does not collect results. Use Variable nodes with $array() and .add() to accumulate.

Example

{
  "type": "loop",
  "data": {
    "label": "processItems",
    "arrayExpression": "$httpResponse.body.items"
  }
}

Flow: loop → process node → (back to loop) → loop → done branch → output.