Hi,
I try to setup a slack interaction using n8n but I struggle with the response.
It seem my output is always the input:
Did I miss something ?
Hi @loranger, welcome to the community 
This is the expected behaviour - the Respond to Webhook node would simply pass through the items it receives, so you can continue with your workflow afterwards if needed.
The reason you are (probably) also seeing this in response to any request sent to your endpoint is the configuration of your initial Webhook trigger node. You want to change the “Respond” option to “Using ‘Respond to Webhook’ Node”:
Afterwards, your request should be answered as it should:
Hope this helps 
