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n8n-expression-syntax

Validate n8n expression syntax and fix common errors in node fields.

Updated Apr 21, 2026
Search Tags:#debugging#n8n#webhook#expressions#node-references#bracket-notation
One-click install
npx skills add https://github.com/withwooyong/n8n-with-ai --skill n8n-expression-syntax-withwooyong
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: n8n-expression-syntax
Source: https://github.com/withwooyong/n8n-with-ai/tree/main/.claude/skills/n8n-expression-syntax
Command: npx skills add https://github.com/withwooyong/n8n-with-ai --skill n8n-expression-syntax-withwooyong

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill helps users write correct n8n expression syntax, reducing workflow errors caused by misreferenced data, missing braces, and incorrect node references.

Core Features & Use Cases

  • Validate and fix core n8n expression patterns using {{}} syntax
  • Access data with $json, $node, $now, and $env correctly, including webhook bodies
  • Reference data between nodes with safe bracket notation for spaces and special characters
  • Debug and troubleshoot common mistakes with real-world examples in EXAMPLES.md
  • Use in workflows to map data between nodes and handle errors gracefully

Quick Start

Open a workflow field and apply the documented {{}} expressions to pull data from previous nodes.

Frequently Asked Questions about n8n-expression-syntax

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I fix n8n expression syntax errors when referencing data between nodes?▼

n8n expressions use {{}} syntax to wrap JavaScript code that dynamically pulls data from previous nodes. This skill validates core variables like $json, $node, $now, and $env, ensuring correct data mapping across typical workflow scenarios.

How do I access webhook body data inside an n8n expression?▼

Access webhook body data in n8n expressions by correctly referencing the incoming JSON payload structure using $json or specific node references. This skill provides examples to ensure you extract webhook fields without missing braces or syntax errors.

Why does my n8n workflow fail when referencing node names with spaces?▼

n8n workflows fail with spaced node names if you use dot notation instead of bracket notation. This skill demonstrates safe bracket notation to reference data between nodes, preventing errors caused by special characters in node names.

Can I use n8n expressions to map data between workflow nodes without errors?▼

Yes, you can use n8n expressions to map data between nodes reliably by applying validated {{}} syntax. This skill enforces best practices with quick checks and troubleshooting guides to help you handle node references and avoid misconfigurations.

What are the limitations of using n8n expressions for workflow automation?▼

Limitations of n8n expressions include susceptibility to misreferenced data and missing braces causing workflow failures. This skill helps anticipate edge cases by validating core patterns and providing a troubleshooting guide to catch common mistakes.

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