n8n-io/n8n · error · SyntaxError

Failed to parse workflow code: ${error.message}. Common caus

Error message

Failed to parse workflow code: ${error.message}. Common causes include unclosed template literals, missing commas, or unbalanced brackets.

What it means

Thrown by parseWorkflowCode when interpretSDKCode raises a generic InterpreterError that is NOT the reserved-name case. The error is re-thrown as a SyntaxError with a 'common causes' hint pointing at unclosed template literals, missing commas, or unbalanced brackets. This catches interpreter-time evaluation failures and unsupported-syntax errors.

Source

Thrown at packages/@n8n/workflow-sdk/src/codegen/parse-workflow-code.ts:634

		const wf = interpretSDKCode(executableCode, sdkFunctions);

		// Return the JSON representation
		return (wf as { toJSON: () => WorkflowJSON }).toJSON();
	} catch (error) {
		if (error instanceof SecurityError) {
			// Re-throw security errors with more context
			throw new SyntaxError(
				`Failed to parse workflow code: ${error.message}. ` +
					'This code contains patterns that are not allowed for security reasons.',
			);
		}
		if (error instanceof InterpreterError) {
			// Check for reserved SDK name conflicts
			if (error.message.includes('reserved SDK function name')) {
				throw new SyntaxError(`Failed to parse workflow code: ${error.message}`);
			}
			// Convert interpreter errors to syntax errors for consistent API
			throw new SyntaxError(
				`Failed to parse workflow code: ${error.message}. ` +
					'Common causes include unclosed template literals, missing commas, or unbalanced brackets.',
			);
		}
		throw error;
	}
}

/**
 * Parses generated TypeScript SDK code and returns the WorkflowBuilder.
 * This allows callers to validate the graph structure before converting to JSON.
 *
 * Uses a secure AST-based interpreter instead of eval/new Function().
 *
 * @param code - TypeScript code generated by generateWorkflowCode()
 * @returns The WorkflowBuilder instance (call validate() then toJSON() on it)
 *
 * @example

View on GitHub (pinned to 5ac6606e81)

Solutions

1. Read the underlying InterpreterError message embedded in the SyntaxError — it carries the specific cause (and often a code frame).
2. Fix the root cause per that sub-error (syntax fix, remove unsupported construct, etc.).
3. If the hint about template literals/commas/brackets applies, validate bracket balance in a JS editor.
4. For unsupported-syntax errors, see the matching error index (1140–1145) for the targeted fix.

Example fix

// before — code passed to parseWorkflowCode has e.g.:
// const cfg = null; cfg.x = 1;  // 1141-style

// after
const cfg = { x: 1 };

import { parseSDKCode } from '@n8n/workflow-sdk/ast-interpreter/parser';
import { interpretSDKCode } from '@n8n/workflow-sdk/ast-interpreter/interpreter';

function dryRun(code: string, sdkFunctions: unknown): { ok: true } | { ok: false; message: string } {
  try {
    parseSDKCode(code);
    interpretSDKCode(code, sdkFunctions as never);
    return { ok: true };
  } catch (e) {
    return { ok: false, message: (e as Error).message.split('\n')[0] };
  }
}

function bracketsBalanced(code: string): boolean {
  const stack: string[] = [];
  const pairs: Record<string, string> = { ')': '(', ']': '[', '}': '{' };
  let inStr: string | null = null;
  for (const ch of code) {
    if (inStr) { if (ch === inStr) inStr = null; continue; }
    if (ch === '\'' || ch === '"' || ch === '`') { inStr = ch; continue; }
    if ('([{'.includes(ch)) stack.push(ch);
    else if (')]}'.includes(ch) && stack.pop() !== pairs[ch]) return false;
  }
  return stack.length === 0;
}

import { parseWorkflowCode } from '@n8n/workflow-sdk/codegen/parse-workflow-code';

try {
  parseWorkflowCode(code);
} catch (e) {
  if (e instanceof SyntaxError && /Common causes include/.test(e.message)) {
    // generic interpreter error — read embedded detail and fix root cause
  }
  throw e;
}

When it happens

Trigger: Any InterpreterError during interpretation: syntax errors from the parser (1143), unsupported node types (1144/1145), null-property assignment (1141), or any other InterpreterError subclass that is not a SecurityError and does not mention 'reserved SDK function name'.

Common situations: Genuinely malformed code (typos); using a forbidden construct whose error bubbled up as InterpreterError; assigning to a property of null; hitting an allowlisted-but-unhandled node.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

Related errors

• Failed to parse workflow code: ${error.message}. This code c
• Failed to parse workflow code: ${error.message}
• Code must export a workflow built with the workflow() SDK fu
• VectorStore "${this.name}" requires an embedding model — set
• topK must be an integer >= 1, got ${k}

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/c235abce380708c0. Report an issue: GitHub.