Why can't I access my webhook data using {{$json.myField}}?

Webhook nodes wrap incoming data in a .body property to separate it from headers and query parameters. You should use {{$json.body.myField}} to access your data.

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

When a node name contains spaces, you must use bracket notation and quotes, for example: {{$node["HTTP Request"].json.data}}.

Why does my n8n expression show up as literal text instead of data?

n8n expressions must be wrapped in double curly braces, like {{$json.field}}. If the braces are missing or only single braces are used, n8n treats the input as a static string.

Can I use n8n expressions inside a Code node?

No, Code nodes use standard JavaScript and do not support the {{}} expression syntax. You should use direct variable access like $json.field or the $input API.

n8n Expression Expert

Name: n8n Expression Expert
Author: sromeroubisos

bysromeroubisos

0•

Productividad y Flujo de Trabajo

Validates and optimizes n8n expression syntax for reliable workflow automation and data mapping.

The n8n Expression Expert skill provides Claude with specialized knowledge for writing, troubleshooting, and fixing n8n's unique expression syntax. It ensures proper usage of the double curly brace {{}} format, correct variable referencing for $json and $node, and handles the common pitfalls of webhook data structures where user data is nested under the body property. This skill is essential for developers building complex n8n workflows who need to ensure data flows correctly between nodes while avoiding syntax errors or type mismatches.

Características Principales

01Correct mapping for webhook data structures using $json.body

02Syntax validation for n8n's double curly brace {{}} expression format

030 GitHub stars

04Troubleshooting for case-sensitive node references and bracket notation

05Expert guidance on Luxon-based date formatting using $now

06Prevention of common mistakes like using expressions inside Code nodes

Casos de Uso

01Debugging 'undefined' property errors when accessing previous node data

02Formatting timestamps and calculating relative dates for scheduling tasks

03Constructing dynamic API request bodies and URLs in HTTP nodes

Características Principales

01Correct mapping for webhook data structures using $json.body

02Syntax validation for n8n's double curly brace {{}} expression format

030 GitHub stars

04Troubleshooting for case-sensitive node references and bracket notation

05Expert guidance on Luxon-based date formatting using $now

06Prevention of common mistakes like using expressions inside Code nodes

Casos de Uso

01Debugging 'undefined' property errors when accessing previous node data

02Formatting timestamps and calculating relative dates for scheduling tasks

03Constructing dynamic API request bodies and URLs in HTTP nodes