n8n-expression-syntax

原文涵盖的主题

• n8n Expression Syntax
• Expression Format
• Core Variables
• $json - Current Node Output
• $node - Reference Other Nodes
• $now - Current Timestamp
• $env - Environment Variables
• 🚨 CRITICAL: Webhook Data Structure

Expert guide for writing correct n8n expressions in workflows. -- All dynamic content in n8n uses double curly braces: Examples: -- Access data from the current node: Access data from any previous node: Important: Node names must be in quotes Node names are case-sensitive Must match exact node name from workflow Access current date/time: Access environment variables: -- Most Common Mistake: Webhook data is NOT at the root! Why: Webhook node wraps incoming data under .body property to preserve headers, params, and query parameters. -- -- Code nodes use direct JavaScript access, NOT expressions! -- Expressions must be wrapped in double curly braces. Field or node names with spaces require bracket notation: Node references are case-sensitive: Don't double-wrap expressions: -- For complete error catalog with fixes, see COMMONMISTAKES.md | Mistake | Fix | |---------|-----| | $json.field | {{$json.field}} | | {{$json.field name}} | {{$json['field name']}} | | {{$node.HTTP Request}} | {{$node["HTTP Request"]}} | | {{{$json.field}}} | {{$json.field}} | | {{$json.name}} (webhook) | {{$json.body.name}} | | '={{$json.email}}' (Code node) | $json.email | -- For real workflow examples, see EXAM

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