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N8N dla początkujących: pętlenie nad elementami

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Opis workflow: N8N dla początkujących - iteracja po elementach

Opis

Ten workflow został zaprojektowany dla początkujących użytkowników n8n, aby zrozumieć, jak narzędzie obsługuje iterację po wielu elementach. Pokazuje dwie kluczowe funkcjonalności:

  • Wbudowana iteracja: Domyślnie większość węzłów n8n przetwarza każdy element tablicy wejściowej
  • Jawna iteracja: Węzeł Loop Over Items pozwala na kontrolowane przetwarzanie elementów, umożliwiając przetwarzanie wsadowe i wieloetapowe workflow

Workflow demonstruje różnicę między przetwarzaniem niepodzielonej tablicy ciągów (jeden element) a podzielonej tablicy (wiele elementów).

Konfiguracja

Dane wejściowe

Aby rozpocząć, wklej następujący JSON do węzła Manual Trigger:

{
  "urls": [
    "https://www.reddit.com",
    "https://www.n8n.io/",
    "https://n8n.io/",
    "https://supabase.com/",
    "https://duckduckgo.com/"
  ]
}

Kroki konfiguracyjne

  1. Kliknij dwukrotnie węzeł "Manual Trigger"
  2. Kliknij "Edit Output" (prawy górny róg)
  3. Wklej JSON i zapisz
  4. Węzeł zmieni kolor na fioletowy, co oznacza przypięte dane testowe
  5. Kliknij przycisk "Test Workflow" na dole kanwy

Opis węzłów w workflow

Nazwa węzłaCel
Manual TriggerRozpoczyna workflow ręcznie i wysyła dane testowe
Split OutKonwertuje tablicę ciągów na osobne obiekty JSON
Loop Over Items (Loop Over Items 1)Pokazuje, jak niepodzielona tablica jest traktowana jako jeden element
Loop Over Items (Loop Over Items 2)Iteruje po każdym elemencie osobno
WaitWprowadza opóźnienie na iterację (ustawione na 1 sekundę)
CodeDodaje stały parametr (param1) do każdego elementu
NoOp (Result Nodes)Wyświetla dane wyjściowe do inspekcji

Szczegóły wykonania

Jak działa workflow

Manual Trigger rozpoczyna wykonanie z wklejonymi danymi JSON. Workflow przebiega dwiema ścieżkami:

  • Ścieżka niepodzielonej tablicy → Loop Over Items 1
    • Przetwarza całą tablicę jako pojedynczy element
    • Result1 i Result5 pokazują, że tablica nie została podzielona
  • Ścieżka podzielonej tablicy → Split Out → Loop Over Items 2
    • Dzieli tablicę na osobne obiekty
    • Result2, Result3, Result4 pokazują, że każdy element jest przetwarzany indywidualnie
    • Węzeł Wait (opóźnienie 1 sekunda) demonstruje kontrolowane wykonanie
    • Węzły Code modyfikują JSON, dodając parametr (param1)

Oczekiwane wyniki

WęzełOczekiwany wynik
Result1 & Result5Cała tablica jest przetwarzana jako jeden element
Result2, Result3, Result4Tablica jest podzielona i przetwarzana jako osobne elementy
Wait NodeDodaje 1-sekundowe opóźnienie dla każdego elementu w Loop Over Items 2

Przykłady zastosowań

Ten workflow może być wykorzystany w wielu scenariuszach automatyzacji, gdzie konieczne jest przetwarzanie wielu elementów. Oto kilka praktycznych zastosowań:

  • Przetwarzanie danych z API: Iteracja przez odpowiedzi API zawierające tablice danych
  • Web scraping: Przetwarzanie wielu adresów URL indywidualnie
  • Automatyzacja zadań: Wykonywanie sekwencji akcji dla każdego elementu
  • Optymalizacja workflow: Kontrola kolejności wykonania, opóźnień i zależności
  • Przetwarzanie plików: Automatyzacja operacji na wielu plikach jednocześnie
  • Integracja systemów: Przesyłanie danych między różnymi systemami w sposób kontrolowany
  • Monitorowanie: Regularne sprawdzanie statusu wielu zasobów

Uwagi

  • Workflow zawiera notatki dla łatwego odniesienia
  • Węzeł Wait jest opcjonalny - można go usunąć dla szybszego wykonania
  • Ten szablon jest przeznaczony dla początkujących, ale może służyć jako podstawa dla bardziej zaawansowanych automatyzacji

   Skopiuj kod szablonu   
{"id":"CDVBZRDH5gNUzIml","meta":{"instanceId":"ab60b809a7fa5daa22fa7edffc14e989a6e59d4063ec838ad62f2655caafd963","templateCredsSetupCompleted":true},"name":"N8N for Beginners: Looping over Items","tags":[],"nodes":[{"id":"500304a1-5164-4907-b0a7-e514e455e3dc","name":"Result1","type":"n8n-nodes-base.noOp","notes":"Look Here to see resulting output","position":[880,-280],"parameters":{},"notesInFlow":true,"typeVersion":1},{"id":"32808ad1-1a35-497f-b1d3-c935a924c541","name":"Result2","type":"n8n-nodes-base.noOp","notes":"Look here to see resulting output","position":[880,40],"parameters":{},"notesInFlow":true,"typeVersion":1},{"id":"f3c9fa5d-a4c7-4cf0-beb5-774d8483974f","name":"Sticky Note","type":"n8n-nodes-base.stickyNote","position":[800,-340],"parameters":{"color":3,"width":320,"height":240,"content":"n### Result1 shows that the array of strings is seen as one item by Loop1"},"typeVersion":1},{"id":"0bb96765-60ce-4618-9b39-7cd203a3cb48","name":"Sticky Note1","type":"n8n-nodes-base.stickyNote","position":[800,-60],"parameters":{"color":3,"width":320,"height":260,"content":"### Result2 shows that the Loop2 sees 5 items after the array of strings is split into separate objects"},"typeVersion":1},{"id":"b71fcc86-b0cd-4241-b0d6-21abe4c6b68d","name":"Sticky Note2","type":"n8n-nodes-base.stickyNote","position":[-1680,-1100],"parameters":{"width":1200,"height":2480,"content":"# N8N for Beginners: Looping Over Itemsnn## DescriptionnnThis workflow is designed for **n8n beginners** to understand how n8n handles **looping (iteration)** over multiple items. It highlights two key behaviors:nn- **Built-In Looping:** By default, most n8n nodes iterate over each item in an input array.n- **Explicit Looping:** The **Loop Over Items** node allows controlled iteration, enabling **custom batch processing** and multi-step workflows.nnThis workflow demonstrates the difference between processing an **unsplit array of strings (single item)** vs. **a split array (multiple items)**.nn---nn## Setupnn### 1. Input DatannTo begin, **paste the following JSON** into the **Manual Trigger** node:nn```jsonn{n "urls": [n "https://www.reddit.com",n "https://www.n8n.io/",n "https://n8n.io/",n "https://supabase.com/",n "https://duckduckgo.com/"n ]n}n```nn📌 **Steps to Paste Data:**n- **Double-click** the "Manual Trigger" node.n- Click **"Edit Output"** (top-right corner).n- Paste the JSON and **Save**.n- The node **turns purple**, indicating that test data is pinned. nn---nn## Explanation of the n8n Nodes in the Workflownn### Manual Trigger nThis node starts the workflow manually and sends test data. n**Documentation:** [Manual Trigger Node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.manualtrigger/)nn### Split Out (Split Array of Strings into Array of Objects) nExtracts the `urls` array and splits it so that each URL becomes a separate JSON object. n**Documentation:** [Split Out Node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.splitout/)nn### Loop Over Items (Loop Over Items 1) nDemonstrates how an **unsplit** array is treated as one item, processing it as a single unit. n**Documentation:** [Loop Over Items Node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.splitinbatches/)nn### Loop Over Items (Loop Over Items 2) nProcesses the **split array** one item at a time. This demonstrates individual iteration and controlled looping. n**Documentation:** [Loop Over Items Node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.splitinbatches/)nn### Wait Node nIntroduces a **1-second delay** per iteration to demonstrate sequential execution. This can be removed for faster performance. n**Documentation:** [Wait Node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.wait/)nn### Code Nodes (Add param1 to outputX) nEach Code node adds a constant field (`param1`) to the data, ensuring that every item gets enriched with the same parameter. n**Documentation:** [Code Node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.code/)nn### NoOp Nodes (Result1, Result2, Result3, Result4, Result5)nThese nodes display the output at different stages of the workflow for inspection.n**Documentation:** [NoOp Node](https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.noop/)nnnn---nn## Execution Detailsnn### 1. How the Workflow Runsnn- **Manual Trigger starts execution** with the pasted JSON data.n- The workflow follows **two paths**:nn#### Unsplit Array Path → Loop Over Items 1 n- The original JSON is processed **as a single item**. n- **Result1 & Result5:** Show that the array was **not split** before processing.nn#### Split Array Path → Split Out → Loop Over Items 2 n- The **Split Out** node converts the `urls` array into separate objects.n- The **Loop Over Items 2** node processes each URL **one by one**.n- A **Wait node** (1-second delay) demonstrates **controlled execution**.n- **Code nodes** modify the JSON, adding the field (`param1`).n- **Result2, Result3, Result4:** Display the final processed output.nn### 2. What You Will Seenn- **Result1 & Result5:** The entire array is processed **as one item** before splitting.n- **Result2, Result3, Result4:** Each URL is processed **individually** after being split.n- **Wait Node:** Adds a **1-second delay per item** in **Loop Over Items 2**.nn---nn## Notesnn- Sticky notes are included in the workflow **for easy reference**.n- The **Wait node** is **optional**—remove it for faster execution.n- This template is structured for **beginners** but serves as a **building block** for more advanced automations.nn---nn"},"typeVersion":1},{"id":"53e7d23a-2a4f-4ada-aeb5-de128acf8625","name":"Split Array of Strings into Array of Objects","type":"n8n-nodes-base.splitOut","position":[-20,380],"parameters":{"options":{"destinationFieldName":"url"},"fieldToSplitOut":"urls"},"typeVersion":1},{"id":"4910fec6-d600-43be-97b2-5050039db416","name":"Sticky Note3","type":"n8n-nodes-base.stickyNote","position":[800,700],"parameters":{"color":3,"width":320,"height":260,"content":"### Result4 shows that we can turn off the looping feature by setting the looping behavior to "Run Once For All Items""},"typeVersion":1},{"id":"f0e68b30-5341-4672-8d8e-7a24d894eb03","name":"Sticky Note4","type":"n8n-nodes-base.stickyNote","position":[800,420],"parameters":{"color":3,"width":320,"height":240,"content":"### Result3 shows that looping over items is built in to n8n nodes"},"typeVersion":1},{"id":"70a987b9-6a4a-49c3-a87c-0dd9cc1879ed","name":"Result3","type":"n8n-nodes-base.noOp","notes":"Look here to see resulting output","position":[900,500],"parameters":{},"notesInFlow":true,"typeVersion":1},{"id":"9de5fac9-e987-4fb1-8f7f-b59af2985e5c","name":"Result4","type":"n8n-nodes-base.noOp","notes":"Look here to see resulting output","position":[900,780],"parameters":{},"notesInFlow":true,"typeVersion":1},{"id":"d5fee847-7758-44ac-a270-6334dd81bb97","name":"Sticky Note5","type":"n8n-nodes-base.stickyNote","position":[800,-640],"parameters":{"color":3,"width":320,"height":260,"content":"### Result5 shows that the array of strings is seen as one item by Code5. So the behavior is the same as Loop1"},"typeVersion":1},{"id":"9a134620-4067-4c7a-8b0f-30e19c93a66c","name":"Result5","type":"n8n-nodes-base.noOp","notes":"Look here to see resulting output","position":[880,-540],"parameters":{},"notesInFlow":true,"typeVersion":1},{"id":"c273cd55-708d-4f86-81f2-3bbe991f59f8","name":"Paste JSON into this node","type":"n8n-nodes-base.manualTrigger","position":[-400,-540],"parameters":{},"typeVersion":1},{"id":"8f64b987-05c5-43a9-89c0-201499df0aa6","name":"Add param1 to output5","type":"n8n-nodes-base.code","position":[320,-540],"parameters":{"jsCode":"n $json.param1 = 'add_me_to_all_items_and_name_me_param1';nnnreturn $json"},"typeVersion":2,"alwaysOutputData":true},{"id":"4920b4e4-b511-4059-b38a-623d14b6df25","name":"Add param1 to output1","type":"n8n-nodes-base.code","position":[500,-180],"parameters":{"mode":"runOnceForEachItem","jsCode":"n $json.param1 = "add_me_to_all_items_and_name_me_param1"nnreturn $json"},"typeVersion":2,"alwaysOutputData":true},{"id":"28ce5239-6437-4b7a-9395-3beb162fded6","name":"Loop over Items 2","type":"n8n-nodes-base.splitInBatches","position":[320,60],"parameters":{"options":{}},"typeVersion":3},{"id":"628edc5e-1b7f-4f50-9c29-8990bd4a5cc0","name":"Loop over Items 1","type":"n8n-nodes-base.splitInBatches","position":[320,-260],"parameters":{"options":{"reset":false}},"typeVersion":3},{"id":"ffccda97-066d-4c13-b4eb-a13ff849b90a","name":"Add param1 to output2","type":"n8n-nodes-base.code","position":[680,220],"parameters":{"mode":"runOnceForEachItem","jsCode":"n $json.param1 = "add_me_to_all_items_and_name_me_param1"nnnreturn $json"},"typeVersion":2,"alwaysOutputData":true},{"id":"6fb44840-6365-46db-9c50-eecd420f274f","name":"Add param1 to output3","type":"n8n-nodes-base.code","position":[320,500],"parameters":{"mode":"runOnceForEachItem","jsCode":"n $json.param1 = "add_me_to_all_items_and_name_me_param1"nnnreturn $json"},"typeVersion":2,"alwaysOutputData":true},{"id":"51b8d766-25ed-407f-a956-693b93bda95f","name":"Add param1 to output4","type":"n8n-nodes-base.code","position":[320,780],"parameters":{"jsCode":"n $json.param1 = "add_me_to_all_items_and_name_me_param1"nnnreturn $json"},"typeVersion":2,"alwaysOutputData":true},{"id":"f8edde34-cf47-42e2-bbd3-552df2509451","name":"Wait one second(just for show)","type":"n8n-nodes-base.wait","position":[480,180],"webhookId":"61aef80b-4e9d-43ae-a083-cd87b4fdec11","parameters":{"amount":1},"typeVersion":1.1}],"active":false,"pinData":{},"settings":{"executionOrder":"v1"},"versionId":"e1eff37a-1ffd-4691-9560-eada5baab88d","connections":{"Result1":{"main":[[]]},"Result2":{"main":[[]]},"Loop over Items 1":{"main":[[{"node":"Result1","type":"main","index":0}],[{"node":"Add param1 to output1","type":"main","index":0}]]},"Loop over Items 2":{"main":[[{"node":"Result2","type":"main","index":0}],[{"node":"Wait one second(just for show)","type":"main","index":0}]]},"Add param1 to output1":{"main":[[{"node":"Loop over Items 1","type":"main","index":0}]]},"Add param1 to output2":{"main":[[{"node":"Loop over Items 2","type":"main","index":0}]]},"Add param1 to output3":{"main":[[{"node":"Result3","type":"main","index":0}]]},"Add param1 to output4":{"main":[[{"node":"Result4","type":"main","index":0}]]},"Add param1 to output5":{"main":[[{"node":"Result5","type":"main","index":0}]]},"Paste JSON into this node":{"main":[[{"node":"Split Array of Strings into Array of Objects","type":"main","index":0},{"node":"Add param1 to output5","type":"main","index":0},{"node":"Loop over Items 1","type":"main","index":0}]]},"Wait one second(just for show)":{"main":[[{"node":"Add param1 to output2","type":"main","index":0}]]},"Split Array of Strings into Array of Objects":{"main":[[{"node":"Loop over Items 2","type":"main","index":0},{"node":"Add param1 to output4","type":"main","index":0},{"node":"Add param1 to output3","type":"main","index":0}]]}}}
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