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Keeps an item based on whether a particular key is present in the data. You choose a key check, such as “this key exists” or “this key does not exist”, and point it at a path in the item. The item is kept when that check passes and filtered out when it does not. Use this for a quick presence test, for example “keep only records that have an email address”.

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Fields

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Sample data

This filter answers yes or no for each item, so there is no before and after. The example uses a “key exists” check on the email path, so it keeps only items that have an email.
FieldValue
ConditionKey email exists
Incoming itemResult
{ "name": "Acme", "email": "info@acme.test" }matches
{ "name": "Globex" }does not match