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What is Loop Node?

A Loop node executes repetitive tasks that depend on previous iteration results until exit conditions are met or the maximum loop count is reached.

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Loop vs. Iteration

TypeDependenciesUse Cases
LoopEach iteration depends on previous resultsRecursive operations, optimization problems
IterationIterations execute independentlyBatch processing, parallel data handling

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Configurations

ParameterDescriptionExample
Loop Termination ConditionExpression that determines when to exit the loopx < 50, error_rate < 0.01
Maximum Loop CountUpper limit on iterations to prevent infinite loops10, 100, 1000
Loop VariablesValues that persist across iterations and remain accessible to nodes after the loop completesA counter x < 50 increases by 1 each iteration. Use it for calculations inside the loop, then access its final value in later workflow steps.
Exit Loop NodeImmediately ends the loop when reachedCaps execution at 10 iterations, regardless of other conditions.
The loop can be terminated by either the Exit Loop Node or the Loop Termination Condition. When either condition is met, the loop will immediately exit.If no exit conditions are specified, the loop will continue executing (similar to while (true)) until it reaches the Maximum Loop Count.

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Example 1: Basic Loop

Goal: Generate random numbers between 1-100 until getting a number less than 50. Steps:
  1. Set up a Loop node by configuring its Loop Termination Condition to trigger when the Template node returns done.
  2. Set up a Code node that generates random integers between 1 and 100.
  3. Set up an IF/ELSE node with the following logic:
  • For numbers ≥ 50: Output the Current Number and continue the loop
  • For numbers < 50: Output the Final Number, and then use the Template node to return done
  1. The workflow terminates automatically once a number below 50 is generated.
Basic loop workflow Steps

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Example 2: Advanced Loop (with Variables and Exit Node)

Goal: Design a workflow that generates a poem through four iterative refinements, with each version building upon the previous one. Steps:
  1. Set up a Loop node with those Loop Variables:
  • num: A counter starting at 0, incrementing by 1 per iteration
  • verse: A text variable initialized with I haven't started creating yet
  1. Set up an IF/ELSE node that evaluates the iteration count:
  • When num > 3: Proceed the Exit Loop node
  • When num ≤ 3: Proceed to the LLM node
  1. Set up an LLM node to generate poems.
Example Prompt:You are a European literary figure who can create poetic verses based on sys.query.verse is your last creation. You can progress based on your previous work.
The first iteration begins with the initial verse value I haven't started creating yet. Each subsequent iteration builds upon the previous output, with the new poem replacing the verse variable’s content.
  1. Set up a Variable Assigner node to manage state:
  • Increment num by 1 after each iteration
  • Update verse with the newly generated poem
  1. When executed, the workflow will produce four versions of your poem, each iteration building upon its previous output.
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