Invalid paremeter when passing an array

Questions & Help Questions
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1

I have this curl.

curl -H "Content-Type: application/json" -X POST -d '{"file_server": {"method": "api/file", "parameter": [{"filepath":"tehnnhjhst", "FileBase64String":"test"}]}}' http://localhost:4000/api/some_method

But I got this JSON response:

{"errors":{"parameter":["is invalid"]}}

This is my model

schema "some_method" do
    field :method, :string
    field :parameter, :string

    timestamps()
  end

I just wanted to store the array as plain text/string to my MySql database.
Is there parse equivalent to this? or?
Any idea? Thank you.