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n8n-expression-syntax

Validate n8n expression syntax and fix common errors in workflows.

Updated Feb 2, 2026
Search Tags:#debugging#syntax#n8n#webhook#data-access#expressions
One-click install
npx skills add https://github.com/Test-perelman/Mailtrix --skill n8n-expression-syntax-test-perelman
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: n8n-expression-syntax
Source: https://github.com/Test-perelman/Mailtrix/tree/main/n8n-skills/skills/n8n-expression-syntax
Command: npx skills add https://github.com/Test-perelman/Mailtrix --skill n8n-expression-syntax-test-perelman

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps users ensure n8n expressions are correctly formatted, preventing runtime errors and misinterpretations of data in workflows.

Core Features & Use Cases

  • Validate and troubleshoot n8n expression syntax ({{}}) across workflows.
  • Provide clear guidance on accessing data with $json, $node, and handling webhook payloads (e.g., using .body).
  • Reference common mistakes with fixes and practical examples to speed up development and reduce debugging time.

Quick Start

Open your workflow, edit a field that uses an expression, and verify that:

  • all dynamic content is wrapped with {{ }} (except in Code nodes),
  • webhook data is accessed via {{$json.body...}},
  • node references use $node["Node Name"].json, with exact case and quotes for spaces.

Frequently Asked Questions about n8n-expression-syntax

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

FAQPage Schema
What is the correct way to use $json in n8n expressions?▼

Use $json in n8n expressions to access the JSON output of the previous node. Wrap the reference in {{ }} braces, such as {{$json.fieldName}}, to dynamically insert data into your workflow fields and ensure correct syntax validation.

How do I access webhook payload data using n8n expressions?▼

Access webhook payload data in n8n expressions by referencing $json.body. When processing incoming webhooks, use the syntax {{$json.body...}} to correctly extract fields from the HTTP request payload without runtime errors.

Why does my n8n expression fail when referencing another node's data?▼

Your n8n expression fails because node names are case-sensitive and require exact matching. Use the syntax $node["Node Name"].json, ensuring you use bracket notation and enclose node names with spaces in quotes to prevent data misinterpretation.

Can I use n8n expressions inside a Code node?▼

You cannot use n8n expressions inside a Code node. Code nodes execute raw JavaScript, so wrapping dynamic content in {{ }} braces causes misuse and errors; restrict expression syntax to regular workflow nodes.

What is the correct way to use $json in n8n expressions?▼

Use $json in n8n expressions to access the JSON output of the previous node. Wrap the reference in {{ }} braces, such as {{$json.fieldName}}, to dynamically insert data into your workflow fields and ensure correct syntax validation.

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