n8n-expression-syntax

Access webhook data through the .body property, like {{$json.body.email}}. The webhook node wraps incoming payloads under body to preserve headers, params, and query, so {{$json.email}} at the root returns undefined.

Expressions without double curly braces are treated as literal strings. Wrap the expression in {{ }}, for example {{$json.email}} instead of $json.email, and avoid double-wrapping like {{{$json.field}}}.

Use {{$node["Node Name"].json.field}} with the node name in quotes and matching exact case. Node names with spaces require bracket notation, such as {{$node["HTTP Request"].json.data}}.

No, Code nodes use direct JavaScript access instead of expression syntax. Write const email = $json.email or use $input.item.json.email rather than '{{$json.email}}', which would be treated as a literal string.

Use bracket notation with quotes for fields containing spaces, such as {{$json['first name']}} or {{$json['user data'].email}}. Dot notation fails because JavaScript interprets the space as the end of the property name.

Avoid expressions in Code nodes, webhook paths, and credential fields. Webhook paths must be static or use URL parameters like :userId, and credentials should use n8n's credential system rather than {{$env.VAR}} references.