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n8n · Expression

$json

n8n expressions read and transform workflow data inside node fields. Use {{ ... }} syntax, and use the Edit Fields (Set) node when a step is mainly for changing data.

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Syntax

{{ expression }}

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  • Edit Fields (Set) node
  • Code node
  • AI Transform node
  • Expression reference
  • JMESPath
  • $input
  • $()

Source: Expressions for data transformation | Build | n8n Docs. Checked 2026-11-03.