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[
  {
    "item_name": "Widget A",
    "quantity": 2,
    "unit_price": 10.00,
    "total": 20.00
  },
  {
    "item_name": "Widget B",
    "quantity": 1,
    "unit_price": 25.50,
    "total": 25.50
  }
]

const items = $input.all();

const lineItems = items.map(item => ({
  item_name: item.json.product.name,
  quantity: item.json.qty,
  unit_price: item.json.price,
  total: item.json.qty * item.json.price
}));

return { json: { lineItems: JSON.stringify(lineItems) } };

// Format dates
{{ $now.toFormat('MMMM d, yyyy') }}

// Access nested data
{{ $json.customer.address.city }}

// Conditional values
{{ $json.discount > 0 ? $json.discount + '%' : 'None' }}

// Format currency
{{ '$' + $json.amount.toFixed(2) }}

// Join array values
{{ $json.tags.join(', ') }}