Mastering Nodes &
Expressions

The universal node. If an API exists, this node can call it.

{
  "method": "POST",
  "url": "https://api.example.com/v1/leads",
  "authentication": "genericCredentialType",
  "sendHeaders": true,
  "sendBody": true,
  "specifyBody": "json",
  "jsonBody": "={{ { name: $json.name, email: $json.email } }}"
}

Two URLs: a Test URL that only fires while the editor is open, and a Production URL live once the workflow is Active.

Reshape items. Add fields, rename fields, drop everything else.

full_name  = ={{ $json.first + ' ' + $json.last }}
email_low  = ={{ $json.email.toLowerCase() }}
source     = "webhook"

const out = [];
for (const item of items) {
  out.push({ json: { id: item.json.id, total: item.json.qty * item.json.price } });
}
return out;

Older workflows use Function. The modern Code node replaces it. Prefer Code.

• Append — concat arrays.
• Combine by matching fields — SQL-style join on a key.
• Combine by position — zip two lists by index.
• Choose Branch — take whichever side arrives first.

Chunks big item lists. Essential for rate limits.

Multi-way IF. Route on {{ $json.type }} to different branches.

{{ $json.plan }} equal "pro"
{{ $json.mrr }} largerEqual 50

Pause the workflow — for N seconds, until a date, or until a webhook is called.

Modern alias for Split In Batches with size 1.

Call another workflow like a function.

{{ { ok: true, id: $json.id, ts: $now.toISO() } }}

Yellow rectangles on the canvas. Annotate why a node exists.

Any field prefixed with = is evaluated as an expression.

={{ $json.customer.name }}
={{ $node["HTTP Request"].json.token }}
={{ $json.mrr > 100 ? "vip" : "std" }}

• $json — current item's JSON.
• $input.all(), $input.first() — array helpers.
• $node["Name"].json — reach into any upstream node.
• $now, $today — Luxon DateTime objects.
• $env.NAME — process env variable.

={{ $json.email.toLowerCase().trim() }}
={{ $now.plus({ days: 7 }).toFormat('yyyy-LL-dd') }}
={{ Math.round($json.total * 1.2 * 100) / 100 }}

1. Slugify a title.
2. Currency format with Intl.NumberFormat.
3. Guard against nulls.