Why do I need double curly braces in n8n?

All dynamic content in n8n must be wrapped in {{ }} to be evaluated as an expression; otherwise, the platform treats it as literal text.

How do I access webhook data correctly in n8n?

Webhook data is typically nested under the .body property. You should use {{$json.body.fieldName}} instead of {{$json.fieldName}} to access incoming payload data.

Can I use n8n expressions inside a Code node?

No. Code nodes use standard JavaScript and direct object access. Instead of '={{$json.field}}', you should use '$json.field' or '$input.item.json.field'.

Are node names case-sensitive when referencing them?

Yes. When using the $node variable, the node name inside the brackets must exactly match the name in your workflow, including capitalization and spaces.

How do I handle field names with spaces in an expression?

Field names with spaces require bracket notation, such as {{$json['field name']}} or {{$node['My Node'].json['data value']}}.

n8n Expression Syntax Expert

Name: n8n Expression Syntax Expert
Author: czlonkowski

byczlonkowski

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1,245

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Productivity & Workflow

Validates and optimizes n8n workflow expressions to ensure accurate data mapping and error-free automation.

The n8n Expression Syntax skill equips Claude with the specialized knowledge required to build and troubleshoot flawless n8n workflows. It focuses on the nuances of the double curly brace syntax, correct referencing of $json and $node variables, and the critical structural differences in webhook data. By identifying common pitfalls—such as case-sensitivity issues, missing braces, or incorrect property nesting—this skill helps developers implement robust automation logic and reduces the time spent on debugging expression errors.

Key Features

01Validation of double curly brace {{}} expression syntax

02Guidance for $node, $json, $now, and $env core variables

03Specific handling for nested webhook data structures

04Detection of invalid expression use in Code nodes and credentials

05Expertise in Luxon date formatting and math operations within n8n

061,245 GitHub stars

Use Cases

01Mapping dynamic data between different n8n nodes accurately

02Formatting timestamps and manipulating strings for API requests

03Troubleshooting 'undefined' property errors in complex workflows

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add czlonkowski/n8n-skills n8n-expression-syntax

For use in Claude.ai and ChatGPT

Download Skill