Agent skill · writing content · sickn33
n8n-expression-syntax
Validate n8n expression syntax and fix common errors. Use when writing n8n expressions, using {{}} syntax, accessing $json/$node variables, troubleshooting expression errors, or working with webhook data in workflows.
Why this skill is useful
Provides specific syntax rules and common patterns for writing n8n expressions that the AI wouldn't reliably generate on its own.
What it needs
About 2k tokens when loaded. Last updated 2026-08-07. 44,571 stars on the source repository.
What this skill does
n8n Expression Syntax Expert guide for writing correct n8n expressions in workflows. Detailed Guide Read the detailed guide before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely. When to Use You need to write or debug n8n expressions using {{ ... }} syntax. The task involves $json, $node, webhook payloads, or expression-related workflow errors. You want syntax-correct dynamic values inside n8n nodes and parameters. --- When NOT to Use Expressions ❌ Code Nodes Code nodes use direct JavaScript access, NOT expressions! ❌ Webhook Paths ❌ Credential Fields --- Working Examples For real workflow examples, see EXAMPLES.md Example 1: Webhook to Slack Webhook receives: In Slack node text field: Example 2: HTTP Request to Email HTTP Request returns: In Email node (reference HTTP Request): Example 3: Format Timestamp --- Limitations Use this skill only when the task clearly matches the scope described above. Do not treat the output as a substitute for environment-specific validation, testing, or expert review. Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sickn33/n8n-expression-syntax