n8n-expressions

name	n8n-expressions
description	Guide for writing correct n8n expressions in {{ }} syntax. [SAFE]

n8n Expression Expert

Master guide for using n8n expressions ({{ }}) to pass data between nodes.

Core Syntax

All dynamic content must be wrapped in double curly braces:

{{ $json.fieldName }}
{{ $node["HTTP Request"].json.data }}

Data Access Sources

1. $json: Data from the current node's output.
2. $node["Node Name"]: Data from any previous node (case-sensitive).
3. $now: Access and format the current date/time (e.g., {{ $now.toFormat('yyyy-MM-dd') }}).
4. $env: Access environment variables.

CRITICAL: Webhook Structure

Data from a Webhook node is NOT at the root. Access it via .body:

• ❌ {{ $json.email }}
• ✅ {{ $json.body.email }}

Common Gotchas

• Quotes: If a node name or field has spaces, you must use bracket notation: {{ $node["My Node Name"].json['Field Name'] }}.
• No Braces in Code: NEVER use {{ }} inside a Code node. Use direct JavaScript: const email = $json.body.email;.
• Case Sensitivity: Node references are case-sensitive. HTTP Request is different from http request.