No function clause matching UserController.create Method when POSTing

Questions & Help Questions
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4

It does not look like the code in the blog You are following… which looks like this

def create(conn, %{"business" => business_params}) do
  with {:ok, %Business{} = business} <- Directory.create_business(business_params) do
    conn
    |> put_status(:created)
    |> put_resp_header("location", business_path(conn, :show, business))
    |> render("show.json", business: business)
  end
end

Anyway, I would not recommend to follow this (old) post because things have changed since.

Maybe try this one, which cover Phoenix 1.5

https://lobotuerto.com/blog/building-a-json-api-in-elixir-with-phoenix/

BTW You are using user variable, which was never defined, and You define user_params, which is never used.