Write custom JavaScript or Python.
When built-in nodes aren't enough, the Code node lets you write custom JavaScript (or Python) to transform data, implement complex logic, or call external libraries.
// Process all items at once
const items = $input.all();
const result = items.map(item => {
const data = item.json;
return {
json: {
fullName: `${data.firstName} ${data.lastName}`,
email: data.email.toLowerCase(),
isVIP: data.totalPurchases > 1000,
joinedDaysAgo: Math.floor(
(Date.now() - new Date(data.createdAt)) / 86400000
)
}
};
});
return result;// Summarize order data
const orders = $input.all().map(i => i.json);
const summary = {
totalOrders: orders.length,
totalRevenue: orders.reduce((sum, o) => sum + o.amount, 0),
avgOrderValue: orders.reduce((sum, o) => sum + o.amount, 0) / orders.length,
topProduct: Object.entries(
orders.reduce((acc, o) => {
acc[o.product] = (acc[o.product] || 0) + 1;
return acc;
}, {})
).sort((a, b) => b[1] - a[1])[0]?.[0]
};
return [{ json: summary }];Answer 2 of 2 correctly to unlock lesson completion.
1. What does "Run Once for All Items" mode do?
2. How can you use external npm packages in the Code node?