Filter

Keep only the items that match your conditions and drop the rest.

What it does

Filter checks its Conditions once for every item that arrives. Items that match leave through the Kept port, unchanged. Items that don’t match are dropped: they go nowhere, and the steps after Filter never see them.

Conditions work like the ones in IF: each compares a value (usually an expression such as {{ $input.price }}) with another value, using an operator for the type you pick (String, Number, Date-Time, Boolean, Array or Object). Link several conditions with AND or OR. They are read from top to bottom, one after the other, with no grouping: A AND B OR C means “(A and B), or C”.

When to use it

• Keep only the products under a price before sending an alert.
• Remove empty rows from a CSV before saving them.
• Keep only the links that point to a given domain.

To send the non-matching items somewhere else instead of dropping them, use IF. To keep the first few items whatever their content, use Limit.

Inputs and settings

Setting	Type	What it does
Conditions REQ(required)	Conditions	The conditions to evaluate.

Write the value to test as an expression on the current item, for example {{ $input.status }} Is Equal To active.

Outputs

• Kept

Each output item has these fields:

Field	Type	What it holds
result	True/false	Whether the conditions held
inData	Any	The incoming data, unchanged

Shape of an output item

{
  "result": true,
  "inData": null
}

The next node receives the kept items themselves, exactly as they arrived, so you keep using the same expressions ({{ $input.price }}) after the Filter. If no item matches, nothing leaves the node.

Dependencies and credentials

None. This node needs no connection and has no slots for other nodes.

Example workflow

Keep only the PDF links of a page:

1. Get All Link with Output field name links reads the links of the open page.
2. Split Out with Field To Split Out links makes one item per link.
3. Filter with the condition {{ $input.links }} (String) Ends With .pdf.
4. Slack posts {{ $input.links }} for every kept link.

Common issues

• Nothing runs after the Filter. No item matched. Open the run and check the values the condition compared: a price read from a page is often text such as "49.90 €", which a Number comparison can’t match. Clean it first with Edit Fields or Regex.
• Items you expected to drop still pass. Check the AND / OR links. Because conditions are read top to bottom without grouping, one OR near the end can let everything through.
• Every item is dropped when comparing text. Text comparisons are exact; check for extra spaces or a different capitalisation in the incoming value.

Related nodes

• IF: route non-matching items to a second branch instead of dropping them.
• Switch: send items to one of several branches.
• Remove Duplicates: drop repeated items.
• Limit: keep only the first items.