Loop

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Enabling Loop

1. Click the step’s options menu (⋮)
2. Click Add Loop
3. Enter a loop expression that determines how the step iterates

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Loop Expression

• A JavaScript expression that returns the next item to process
• Returns null, undefined, or false to terminate the loop
• Has access to special variables:
  • index: Current iteration number (starts at 0)
  • item: Current value being processed

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Loop Output

• When loop is enabled, the step’s output becomes an array
• Each array element contains the output from one iteration
• Output array maintains the order of processing

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Loop Expression Rules

• Return one item at a time from the array: return items[index];
• Never return the full array (causes infinite loop)

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Accessing Output

const results = modelStep.output.map((item) => item.message);

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Loop Termination

return items[index]; // Returns undefined when index >= length

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Examples

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Parallel API Requests

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File Batch Processing

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Object Properties Processing

const entries = Object.entries({
  apple: 'red',
  banana: 'yellow',
  orange: 'orange',
});

return entries[index]
  ? { key: entries[index][0], value: entries[index][1] }
  : null;

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Remove Loop

1. Click the step’s options menu (⋮)
2. Click Remove Loop