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n8n-expression-syntax

Craft correct n8n expressions with syntax patterns and fixes.

Updated Apr 2, 2026
Search Tags:#workflow#debugging#n8n#webhook#expressions#node-ref
One-click install
npx skills add https://github.com/jason23452/n8n --skill n8n-expression-syntax-jason23452
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: n8n-expression-syntax
Source: https://github.com/jason23452/n8n/tree/main/.opencode/skills/n8n-expression-syntax
Command: npx skills add https://github.com/jason23452/n8n --skill n8n-expression-syntax-jason23452

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Writing and debugging n8n expressions is error-prone due to the required {{}} syntax, nested paths, and webhook data structure under .body. This guide helps users adopt correct expression usage, avoid common pitfalls, and follow best practices to build reliable workflows.

Core Features & Use Cases

  • Formal expression syntax: Learn the standard {{expression}} pattern and how to apply it across $json, $node, $now, and $env.
  • Webhook data handling: Understand that webhook data is inside .body and how to access it in expressions.
  • Node reference patterns: Correctly reference data from other nodes with $node["Node Name"].json and quote names with spaces.
  • Debugging & validation: Use the expression editor, error messages, and quick fixes to resolve issues quickly.
  • Use cases: Compose dynamic messages, format dates, manipulate strings, and build data-driven alerts.

Quick Start

Experiment with a simple expression like Hello {{$json.body.name}} in the expression editor to see real-time results.

Frequently Asked Questions about n8n-expression-syntax

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

FAQPage Schema
How do I access webhook data in n8n expressions?▼

Access webhook data in n8n expressions by targeting the `.body` property, such as `{{$json.body.name}}`. This ensures you correctly extract payload fields from incoming webhook requests for dynamic workflow content.

Why does my n8n expression syntax keep failing?▼

n8n expressions fail when the standard `{{expression}}` syntax is broken or nested paths are incorrect. Use the expression editor to validate references, ensure proper bracket closure, and apply fixes for common syntax mistakes.

How do I reference data from other nodes in n8n workflows?▼

Reference data from other nodes using the `$node["Node Name"].json` pattern. Always quote node names containing spaces to ensure the expression correctly retrieves data across your workflow.

What's the best way to debug n8n expressions?▼

Debug n8n expressions by leveraging the expression editor for real-time validation and reviewing error messages. This approach helps identify incorrect node references, syntax issues, and malformed webhook data paths quickly.

Can I format dates and manipulate strings in n8n expressions?▼

Format dates and manipulate strings in n8n expressions using variables like `$now`. This allows you to compose dynamic messages and build data-driven alerts directly within your workflow nodes.

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