Hi Everyone,
Attempting to set-up a JSON filter for the Notion node:
Everything works fine (above) when I copy and paste a JSON string in:
But if that same string is passed from another module:
An error is returned
I thought that the [Object:] when a string was passed through was removed, but perhaps not.
Hey @pb84, I think you’re running into a peculiarity with the “JSON” fields in n8n here.
Some nodes would seem to expect an actual JSON value while others expect a string from the looks of it 
For the Notion node specifically, n8n tries to convert a string into JSON, meaning the input data needs to be a string rather than an actual JSON object, otherwise the error you have seen is thrown.
The [Object:... result you are seeing would, however, suggest you are providing a JSON object rather than a string.
So my first suggestion would be to try and stringify your object. So instead of using {{ $node["Convert to List"].json["search"] }}, could you try {{ JSON.stringify($node["Convert to List"].json["search"]) }} and confirm whether this works for you?
Thank you so much, another beautiful solution
