Function Node Only Processes 1 Item (Expected 5 Items from Loop)

Issa2024 · May 16, 2025, 11:24am

Hello this is my configuration :

i m on premise :

n8n version: : 1.64.3
Database (default: SQLite): Postgress
n8n EXECUTIONS_PROCESS setting (default: own, main): : default
Running n8n via (Docker, npm, n8n cloud, desktop app): Docker
Operating system: : Debian 12

Problem Description:

I’m building a workflow that processes a list of CSV file records. I have a total of 5 items, one of which is a summary record (“fileName”: “Total”), which I later ignore.

The structure is as follows:

A Code node creates the 5 items

A Loop Over Items node processes them

A Replace Me node confirms that all 5 items go through

Then, in the Code1 Function node, I want to generate a new filename for each item

Issue:

Even though the Code1 node receives 5 items (I can confirm this in the input), it only outputs 1 item — it seems to process just the first one.
Workflow Screenshot:

Included in my post (see attached)
🔍 Debug & Observations:

Here’s what I currently have in Code1:

const data = $node["Code"];
const orga = data.json["Orga"];
const originalFilename = data.json["fileName"];
const newFilename = `_${orga}.csv`;

return {
  json: {
    originalFilename,
    newFilename
  }
};

Problem:

This accesses $node[“Code”].json, which only gives the first item — not all the items passed from the previous node.
What I Want:

I want the node to rename each file individually, and return 4 renamed files (excluding the “Total” item).


Use $json instead of $node[...] inside a Function node when you’re processing multiple items (especially after a Loop):

const dateExploitation = ""; // or use $node["foundDateExploitation"].json["dateOnly"];

const orga = $json["Orga"];
const originalFilename = $json["fileName"];
const newFilename = `${dateExploitation}_${orga}.csv`;

return {
  json: {
    originalFilename,
    newFilename
  }
};

Expected Output:

[
  { "originalFilename": "file-A.csv", "newFilename": "2025-05-16_1.csv" },
  { "originalFilename": "file-B.csv", "newFilename": "2025-05-16_2.csv" },
  ...
]

Attached: