n8n-io/n8n · error

Cell at row ${rowIndex}, column ${colIndex} exceeds max stri

Error message

Cell at row ${rowIndex}, column ${colIndex} exceeds max string length of ${MAX_CELL_STRING_LENGTH} characters

What it means

Error "Cell at row ${rowIndex}, column ${colIndex} exceeds max string length of ${MAX_CELL_STRING_LENGTH} characters" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/instance-ai/src/parsers/structured-file-parser.ts:249

	const allDate = nonNull.every((v) => typeof v === 'string' && looksLikeDate(v));
	if (allDate) return 'date';

	return 'string';
}

// ── Parsing core ────────────────────────────────────────────────────────────

function validateCellValue(value: unknown, colIndex: number, rowIndex: number): CellValue {
	if (value === null || value === undefined || value === '') return null;
	if (typeof value === 'boolean') return value;
	if (typeof value === 'number') {
		if (!isFinite(value)) return null;
		return value;
	}
	if (typeof value === 'string') {
		if (value.length > MAX_CELL_STRING_LENGTH) {
			throw new Error(
				`Cell at row ${rowIndex}, column ${colIndex} exceeds max string length of ${MAX_CELL_STRING_LENGTH} characters`,
			);
		}
		return value;
	}
	// Arrays and objects are not allowed in flat rows
	throw new Error(
		`Unsupported value type "${typeof value}" at row ${rowIndex}, column ${colIndex}`,
	);
}

function hasDangerousKey(obj: Record<string, unknown>): string | undefined {
	for (const key of Object.keys(obj)) {
		if (DANGEROUS_KEYS.has(key)) return key;
	}
	return undefined;
}

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/instance-ai/src/parsers/structured-file-parser.ts:249 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/65682a879d756dc1. Report an issue: GitHub.