n8n-expression-syntax

n8n webhook payloads are not stored at the root, so reading $json directly fails. You must access webhook values using $json.body.* to correctly map the incoming payload data in your expression syntax.

To reference data from another node in n8n expressions, use $node with correct quoting and exact casing for the node name, ensuring proper double-curly {{ }} wrapping to prevent workflow debugging errors.

No, you should not use double curly braces {{ }} inside n8n Code nodes. Code nodes execute standard JavaScript, so wrapping variables in expression syntax is disallowed and will cause syntax validation failures.

Access n8n array elements using bracket index notation like [0], and use bracket notation for field names containing spaces. This ensures correct data mapping and prevents expression syntax errors during workflow debugging.

Fix n8n expression errors by ensuring proper double-curly wrapping, verifying correct .json/.body paths, and checking for missing braces or double-wrapping. Use $json, $node, $now, and $env variables accurately to stop workflows from breaking.