Why isn't my n8n expression working?

Common issues include missing double curly braces {{ }}, case-sensitivity in node names, or forgetting that webhook data is specifically nested under the .body property.

Can I use expressions inside n8n Code nodes?

No, Code nodes use direct JavaScript. Instead of using '={{$json.field}}', you should use '$json.field' or the newer '$input.item.json.field' syntax.

How do I access data from a node with a space in its name?

You must use bracket notation with double quotes for node names containing spaces, for example: {{$node["HTTP Request"].json.data}}.

What is the correct way to format dates in n8n?

Use the $now variable with Luxon methods. For example, to get a year-month-day format, use {{$now.toFormat('yyyy-MM-dd')}}.

n8n Expression Syntax

Name: n8n Expression Syntax
Author: thanhtoan105

bythanhtoan105

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Productivity & Workflow

Validates n8n workflow expressions and corrects common syntax errors to ensure reliable automation performance.

About

This skill provides an expert guide for writing and troubleshooting n8n expressions, ensuring developers correctly use double curly braces, access $json and $node variables, and handle the specific structure of webhook data. It helps prevent common mistakes like incorrect nesting, case-sensitivity issues in node names, and the misuse of expressions within Code nodes, ultimately accelerating the development of robust n8n workflows. By providing standardized patterns for Luxon-based date manipulation and bracket notation for complex field names, it serves as a critical linting and implementation resource for automation engineers.

Key Features

1 GitHub stars
Corrects data access paths for $json, $node, and $now variables
Identifies and fixes the common 'webhook body' structure mistake
Distinguishes between n8n expressions and direct JavaScript in Code nodes
Provides formatting rules for field names with spaces and special characters
Validates double curly brace {{}} syntax for dynamic content

Use Cases

Formatting dates and timestamps using the built-in Luxon-based $now variable
Accessing data from previous nodes in complex multi-step n8n workflows
Troubleshooting 'undefined' errors when working with webhook triggers

About

Key Features

1 GitHub stars
Corrects data access paths for $json, $node, and $now variables
Identifies and fixes the common 'webhook body' structure mistake
Distinguishes between n8n expressions and direct JavaScript in Code nodes
Provides formatting rules for field names with spaces and special characters
Validates double curly brace {{}} syntax for dynamic content

Use Cases

Formatting dates and timestamps using the built-in Luxon-based $now variable
Accessing data from previous nodes in complex multi-step n8n workflows
Troubleshooting 'undefined' errors when working with webhook triggers