Send multiple pdf binary files in one HTTP post request dynamically (Stirling PDFs API)

[SauerWorkflow]

Hello,

I’m looking to use the Stirling PDF API to merge multiple PDFs together.
I’d like to automate this, but I can’t seem to dynamically send multiple pdfs via an HTTP POST request.

It works in Postman. But I can’t get it to work in n8n.

Stirling API:

Postman:

In the Http POST node we can only pass fixed values ​​for n8n binary data, there is no expression option.

Thank you in advance for your help.

Best Regards,

[EmeraldHerald]

Hi @SauerWorkflow

You wouldn’t be able to do this with one singular HTTP request node - you can check out this post for some alternative options, though:

Pass several files with HTTP node

Hi @Nick_K_H, does your service accept these files in individual requests? If so, you can split our files into individual n8n items with one file each: If your service requires all files in a single request in separate fields I am afraid you’d have to create multiple routes in your workflow that handle the different possible options. You could use a Filter node here checking if {{ Object.keys($binary).length }} equals 2, if so connect an HTTP Request node processing attachment_0 and attachmen…

[ekadin]

This seems like another use case for Http Request Node - Parameters with the same name - Feature Requests - n8n

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