Download and Merge Multiple PDFs from URLs with the CustomJS API

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.

@custom-js/n8n-nodes-pdf-toolkit

What this workflow does

• Defines an array of PDF URLs.
• Splits the array to process each URL individually.
• Downloads each PDF using an HTTP Request.
• Merges all downloaded PDFs using the Merge PDF node from the @custom-js/n8n-nodes-pdf-toolkit.
• Writes the final merged PDF to disk.

Requirements

A free CustomJS account. An API Key saved in n8n as credentials of type CustomJS account.

Notice

Community nodes can only be installed on self-hosted instances of n8n.

Usage

Get API key from customJS

• Sign up to customJS platform.
• Navigate to your profile page
• Press "Show" button to get API key

Set Credentials for CustomJS API on n8n

Copy and paster your API key generated from CustomJS here.

Design workflow

• A Manual Trigger for starting workflow.
• A code node that returns URLs of PDF files as an array
• Split Out node for concurrent processing
• HTTP node for downloading PDF file locally
• Merge PDFs node for merging files
• Write to Disk node for saving merged PDF file.

You can replace logic for triggering and returning results. For example, you can trigger this workflow by calling a webhook and get a result as a response from webhook. Simply replace Manual Trigger and Write to Disk nodes.

Perfect for

• Bundling reports or invoices.
• Generating document sets from external sources.
• Automating PDF handling without writing custom code.