N8n Validation Expert

If you're working with n8n programmatically, you'll hit validation errors. This skill teaches you to interpret them and fix them in the typical 2-3 iteration loop (validate, think 23 seconds, fix, repeat). It breaks down the five validation profiles from minimal to strict, explains the difference between errors that block execution and warnings that don't, and walks through the six common error types like missing_required and invalid_reference. The patchNodeField section alone is worth it if you're doing partial workflow updates, since those operations are intentionally strict and fail loudly on ambiguous matches or missing strings.

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GitHub stars: 6.6K
last updated: Aug 21, 2026

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Install

$ npx -y skills add czlonkowski/n8n-skills --skill n8n-validation-expert --agent claude-code

Installs into .claude/skills of the current project.

Files

n8n Validation Expert

Expert guide for interpreting and fixing n8n validation errors.

Validation Philosophy

Validate early, validate often

Validation is typically iterative:

Expect validation feedback loops
Usually 2-3 validate → fix cycles
Average: 23s thinking about errors, 58s fixing them

Key insight: Validation is an iterative process, not one-shot!

Error Severity Levels

1. Errors (Must Fix)

Blocks workflow execution - Must be resolved before activation

Types:

missing_required - Required field not provided
invalid_value - Value doesn't match allowed options
type_mismatch - Wrong data type (string instead of number)
invalid_reference - Referenced node doesn't exist
invalid_expression - Expression syntax error

Example:

{
  "type": "missing_required",
  "property": "channel",
  "message": "Channel name is required",
  "fix": "Provide a channel name (lowercase, no spaces, 1-80 characters)"
}