Filter for filetype .pdf

[Eulallia]

Hi together,

it’s my first post here and first steps with n8n, please be patient

What I’m trying to do:

Receiving an email with one or more attachments. I want to send an email with all attachments that are a pdf to another address. So I added a filter, but I don’t know how the filter should be configured correctly.

Can you help?

Here’s the workflow so far

• n8n version: 1.14.2
• Database (default: SQLite): ?
• n8n EXECUTIONS_PROCESS setting (default: own, main): ?
• **Running n8n via (Docker, npm, n8n cloud, desktop app): docker **
• Operating system: linux

[n8n]

It looks like your topic is missing some important information. Could you provide the following if applicable.

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

[ihortom]

@Eulallia , the filter could be something like this

Note the expression used is {{ $binary.attachment_0.fileExtension }} ($binary, not $json). Check out Data structure as a reference to the topic of the data structure in n8n.

[Eulallia]

Hi @ihortom

that works thank you! If there are more than one PDF in the email, how can I split the PDF so that the filter is on each PDF and after that for each PDF an extra email send?

I tried loop over items but somehow it seems that multiple PDF coing from IMAP are handled as 1 item?

[ihortom]

@Eulallia , I haven’t seen how the data looks like when there is more than one attachments. However, as per document on data structure I would expect to see something like

. . .
"binary": {
  "attachment_0": {
    . . .
  }, 
  "attachment_1": {
    . . .
  }, 
  . . .
}

Therefore, you can discover the number of attachments and their names by checking the keys. Something like this, Object.keys($binary). The outcome would be an array of this kind, ["attachment_0", "attachment_1", . . .].

Hopefully you can handle it from here (assuming my understanding of attachments is correct ).