node cookbook
N8N Code Node Cookbook
Use the Code node when built-in nodes cannot express the required transformation, branching, formatting, or lightweight custom logic.
Independent third-party notes. n8n is a trademark of its owner and is referenced only for compatibility and troubleshooting context.
Quick Answer
Use the Code node when built-in nodes cannot express the required transformation, branching, formatting, or lightweight custom logic.
Key Facts
- Node role
- Run custom code inside a workflow.
- Best fit
- Data transformation, cleanup, custom mapping, and small pieces of logic.
- Risk
- Large or inefficient code can contribute to memory and execution issues.
- Common companion nodes
- Set, IF, HTTP Request, Webhook, and database nodes.
Recommended Steps
- Use built-in nodes first when they cover the transformation.
- Keep Code node logic small and focused.
- Validate item shapes before accessing nested fields.
- Test with representative input data.
- Move very heavy processing outside n8n if it becomes resource-intensive.
Verification
- The output item shape matches downstream node expectations.
- Empty and malformed inputs are handled.
- Execution time and memory stay acceptable with real data.
Warnings
- Complex Code nodes are harder for non-developers to maintain.
- Large data transformations can increase memory pressure.