Durasi: 15 menit | Block: 3

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💻 Code Node = JavaScript di Dalam Workflow

Kapan pakai Code Node:

• Transformasi data yang ga bisa di Set Node
• Array manipulation (filter, map, sort, reduce)
• Conditional logic yang complex
• Format data custom

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🔣 Code Node Basics

Mode: "Run Once for All Items" vs "Run Once for Each Item"

Mode	Kapan	Input	Output
All Items	Batch processing	Array of all items	Array of all items
Each Item	Per-record transform	Single item	Single item

Contoh 1: Format Phone Number (Each Item)

// Input: { telepon: "081234567890" }
const raw = $input.item.json.telepon;

// Normalize ke format internasional
let phone = raw.replace(/\D/g, ''); // hapus non-digit
if (phone.startsWith('0')) {
  phone = '62' + phone.substring(1);
}

return {
  json: {
    ...$input.item.json,
    telepon_formatted: phone
  }
};

Contoh 2: Filter & Sort (All Items)

// Ambil semua item, filter & sort
const items = $input.all();

const filtered = items
  .filter(item => item.json.amount > 100000) // hanya order > 100K
  .sort((a, b) => b.json.amount - a.json.amount) // sort descending
  .slice(0, 10); // top 10

return filtered;

Contoh 3: Aggregate / Summary (All Items)

const items = $input.all();

const summary = {
  total_orders: items.length,
  total_revenue: items.reduce((sum, i) => sum + (i.json.amount || 0), 0),
  avg_order: items.reduce((sum, i) => sum + (i.json.amount || 0), 0) / items.length,
  unique_customers: [...new Set(items.map(i => i.json.email))].length
};

return [{ json: summary }];

Contoh 4: Date Manipulation

const now = new Date();
const dueDate = new Date(now.getTime() + 7 * 24 * 60 * 60 * 1000); // +7 hari

return {
  json: {
    ...$input.item.json,
    created_at: now.toISOString(),
    due_date: dueDate.toISOString(),
    due_date_formatted: dueDate.toLocaleDateString('id-ID', { 
      day: 'numeric', month: 'long', year: 'numeric' 
    })
  }
};

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🧩 Sub-Workflows = Modular Design

Kenapa Sub-Workflows?

Tanpa sub-workflow:
Workflow A = 50 node → susah maintain, susah debug, susah reuse

Dengan sub-workflow:
Workflow A → [Call Sub-Workflow: Format Phone] → continue
                     ↑
Workflow B → [Call Sub-Workflow: Format Phone] → continue
            (reuse logic yang sama)

Build Sub-Workflow

Sub-Workflow: "Format Phone Number"

[Webhook Trigger (called by parent)]
    → [Code Node: normalize phone]
    → [Respond to Webhook: return formatted data]

Parent Workflow:

[Trigger]
    → [Execute Workflow Node: "Format Phone Number"]
        → input: pass $json
        → output: formatted data
    → [Continue with formatted phone]

Execute Workflow Node Config

Node: Execute Workflow
- Source: Database
- Workflow: "Format Phone Number"
- Mode: Wait for Sub-Workflow to Complete

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📊 When to Use What

Need	Solution
Simple value mapping	Set Node (Edit Fields)
Conditional value	Expression with ternary
Simple logic per item	Code Node (Each Item)
Batch transform	Code Node (All Items)
Reusable logic across workflows	Sub-Workflow
External API call in logic	Code Node + $http helper

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⚠️ Common Mistakes

1. ❌ Pakai Code Node untuk hal yang bisa di Set Node (overcomplicate)
2. ❌ Lupa return di Code Node → no output → error
3. ❌ Sub-workflow tanpa error handling → parent ga tahu kalau gagal
4. ❌ Circular sub-workflow calls → infinite loop