n8n-expression-syntax

To fix incorrect n8n expressions, validate your syntax for dynamic content like $json and $node, ensure braces are correctly placed, and access nested webhook fields through json.body using bracket notation for spaces.

Access nested webhook data in n8n expressions by targeting json.body properties and using bracket notation for field names containing spaces, enabling correct retrieval of nested arrays and concatenations.

n8n expressions use syntax like {{}} with $json or $env for dynamic fields, whereas a Code node allows direct JavaScript execution. Expressions are preferred for simple data references to avoid common mistakes.

n8n expressions fail when braces are misplaced or node references are incorrect. Validate your $node syntax and ensure you are accurately targeting the specific node-to-node data structure.

Use $now for current datetime injection and $env for environment variable access within n8n expressions. Wrap them in {{}} syntax to safely build dynamic fields in your workflows.

Validation rules for n8n expressions require proper {{}} usage, avoiding Code nodes for simple expressions, using brackets for spaces in webhook data, and following a structured debugging approach to test corrections.