n8n-expression-syntax

To access webhook data in n8n expressions, use the {{$json.body}} pattern. Webhook payloads reside under the .body property, so referencing {{$json.body.fieldName}} ensures your workflow retrieves the correct data from incoming requests.

The correct syntax for cross-node references in n8n expressions is {{$node["Node Name"].json.field}}. You must wrap the node name in brackets and quotes, and always wrap the entire expression in double curly braces.

n8n expressions fail inside Code nodes because Code nodes execute JavaScript directly, not n8n expression syntax. You should write standard JavaScript code to manipulate data instead of using {{}} templates in Code nodes.

You validate n8n expression syntax by testing dynamic fields in the Expression Editor. Ensure expressions use proper {{}} wrapping and correct $json or $node access patterns to prevent workflow automation errors during data transformation.

Yes, you can use $now and $env variables in n8n workflow expressions by wrapping them in {{}} syntax. These variables allow you to dynamically inject current timestamps and environment variables into your workflow node configurations.

Common mistakes building n8n expressions for HTTP requests include referencing the wrong node name, failing to use the .body property for webhook data, and forgetting the double curly braces. Validate your syntax in the Expression Editor to avoid these errors.