Interpret validation errors and guide fixing them. Use when encountering validation errors, validation warnings, false positives, operator structure issues, or need help understanding validation results. Also use when asking about validation profiles, error types, or the validation loop process.
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name
n8n-validation-expert
description
Interpret validation errors and guide fixing them. Use when encountering validation errors, validation warnings, false positives, operator structure issues, or need help understanding validation results. Also use when asking about validation profiles, error types, or the validation loop process.
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)"
}
2. Warnings (Should Fix)
Doesn't block execution - Workflow can be activated but may have issues
Types:
best_practice - Recommended but not required
deprecated - Using old API/feature
performance - Potential performance issue
Example:
{"type":"best_practice","property":"errorHandling","message":"Slack API can have rate limits","suggestion":"Add onError: 'continueRegularOutput' with retryOnFail"}
3. Suggestions (Optional)
Nice to have - Improvements that could enhance workflow
{
"valid": false,
"errors": [
{
"type": "missing_required",
"property": "channel",
"message": "Channel name is required",
"fix": "Provide a channel name (lowercase, no spaces)"
}
],
"warnings": [
{
"type": "best_practice",
"property": "errorHandling",
"message": "Slack API can have rate limits",
"suggestion": "Add onError: 'continueRegularOutput'"
}
],
"suggestions": [
{
"type": "optimization",
"message": "Consider using batch operations for multiple messages"
}
],
"summary": {
"hasErrors": true,
"errorCount": 1,
"warningCount": 1,
"suggestionCount": 1
}
}
How to Read It
1. Check valid field
if (result.valid) {
// ✅ Configuration is valid
} else {
// ❌ Has errors - must fix before deployment
}
2. Fix errors first
result.errors.forEach(error => {
console.log(`Error in ${error.property}: ${error.message}`);
console.log(`Fix: ${error.fix}`);
});
3. Review warnings
result.warnings.forEach(warning => {
console.log(`Warning: ${warning.message}`);
console.log(`Suggestion: ${warning.suggestion}`);
// Decide if you need to address this
});
4. Consider suggestions
// Optional improvements// Not required but may enhance workflow
Workflow Validation
validate_workflow (Structure)
Validates entire workflow, not just individual nodes
