MongoDB node: fields.split is not a function

[Crayonan]

Dear N8N community,

I am fairly new to n8n and trying to figure everything out step by step, I am trying to insert data into my MongoDB database

What is the error message (if any)?

Problem in node ‘MongoDB‘

fields.split is not a function

Please share your workflow

## Information on your n8n setup
- **n8n version: 1.67.1**
- **Database (default: SQLite): (postgres:16-alpine)**
- **n8n EXECUTIONS_PROCESS setting (default: own, main): **
- **Running n8n via (Docker, npm, n8n cloud, desktop app): Docker**
- **Operating system: Ubuntu 22.04**

[ihortom]

Welcome to the community @Crayonan !

Tip for sharing information

Pasting your n8n workflow

---

Ensure to copy your n8n workflow and paste it in the code block, that is in between the pairs of triple backticks, which also could be achieved by clicking </> (preformatted text) in the editor and pasting in your workflow.

```
<your workflow>
```

That implies to any JSON output you would like to share with us.

Make sure that you have removed any sensitive information from your workflow and include dummy or pinned data with it!

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The “Fields” box expects the comma-separated names of the fields you want to insert, not the actual item (object). Those names are the property names of the incoming item.

For example,