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Fanout takes a JSON array as input and runs the downstream node once per element, in parallel. When all parallel runs complete, the results merge back into a JSON array and flow onward. The fan-in happens automatically: the node immediately following the fanned-out node collects all results into an array, preserving order. No manual collection step needed. Example: You have a list of 50 customer questions. Fanout splits the array, the downstream Prompt node processes each question independently and in parallel, and the results recombine into a single array of answers.