CustomJS This workflow corresponds to n8n.io template #3873 — we link there as the canonical source.
This workflow follows the HTTP Request → Readwritefile recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"id": "0ZgxlAsLyuTYgCGc",
"meta": {
"templateCredsSetupCompleted": true
},
"name": "Merge multiple PDF files with CustomJS API",
"tags": [],
"nodes": [
{
"id": "4d6f1e0f-c730-4d53-b5c7-b2f7df1d8d7f",
"name": "When clicking \u2018Test workflow\u2019",
"type": "n8n-nodes-base.manualTrigger",
"position": [
-224,
112
],
"parameters": {},
"typeVersion": 1
},
{
"id": "f84d01f0-fd9e-49b8-b172-49f8de723148",
"name": "HTTP Request",
"type": "n8n-nodes-base.httpRequest",
"position": [
0,
0
],
"parameters": {
"url": "=https://www.intewa.com/fileadmin/documents/pdf-file.pdf",
"options": {}
},
"typeVersion": 4.2
},
{
"id": "d433b3e9-582c-4ca8-9ca8-266c430f3962",
"name": "HTTP Request2",
"type": "n8n-nodes-base.httpRequest",
"position": [
0,
208
],
"parameters": {
"url": "=https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf",
"options": {}
},
"typeVersion": 4.2
},
{
"id": "7a8c50e5-3b90-46cd-8f67-5910d2cfb5fc",
"name": "Merge",
"type": "n8n-nodes-base.merge",
"position": [
224,
112
],
"parameters": {},
"typeVersion": 3.1
},
{
"id": "d1e0f43a-e246-4896-9c91-7e67722ec154",
"name": "Read/Write Files from Disk",
"type": "n8n-nodes-base.readWriteFile",
"position": [
832,
112
],
"parameters": {
"options": {},
"fileName": "test.pdf",
"operation": "write"
},
"typeVersion": 1
},
{
"id": "9342b052-e1d6-4381-b883-717a31244d04",
"name": "Read/Write Files from Disk4",
"type": "n8n-nodes-base.readWriteFile",
"position": [
1088,
112
],
"parameters": {
"options": {},
"fileSelector": "test.pdf"
},
"typeVersion": 1
},
{
"id": "1f75c078-94de-42bf-911e-ba88b3f71b4c",
"name": "Merge PDFs",
"type": "@custom-js/n8n-nodes-pdf-toolkit-v2.pdfToolkit",
"position": [
512,
112
],
"parameters": {
"resource": "pdf",
"operation": "merge"
},
"credentials": {
"customJsApi": {
"name": "<your credential>"
}
},
"typeVersion": 1
}
],
"active": false,
"settings": {
"executionOrder": "v1"
},
"versionId": "c17799ab-00d4-4fc4-b1c9-19f27bbb00a9",
"connections": {
"Merge": {
"main": [
[
{
"node": "Merge PDFs",
"type": "main",
"index": 0
}
]
]
},
"Merge PDFs": {
"main": [
[
{
"node": "Read/Write Files from Disk",
"type": "main",
"index": 0
}
]
]
},
"HTTP Request": {
"main": [
[
{
"node": "Merge",
"type": "main",
"index": 0
}
]
]
},
"HTTP Request2": {
"main": [
[
{
"node": "Merge",
"type": "main",
"index": 1
}
]
]
},
"Read/Write Files from Disk": {
"main": [
[
{
"node": "Read/Write Files from Disk4",
"type": "main",
"index": 0
}
]
]
},
"When clicking \u2018Test workflow\u2019": {
"main": [
[
{
"node": "HTTP Request",
"type": "main",
"index": 0
},
{
"node": "HTTP Request2",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
customJsApi
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About this workflow
This n8n template demonstrates how to download multiple PDF files from public URLs and merge them into a single PDF using the PDF Toolkit from www.customjs.space.
Source: https://n8n.io/workflows/3873/ — original creator credit. Request a take-down →
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