I’m trying to seed data to phoenix database using json file.
Let’s say I have at priv/repo/seeds/some_file.json in my phoenix directory.

# priv/repo/seeds.exs
json_file = "#{__DIR__}/seeds/some_file.json"

with {:ok, body} <- File.read(json_file),
     {:ok, json} <- Jason.decode(body, keys: :atom) do
  # insert to db
else
  err ->
      IO.inspect(err)
end

But i got the following error when running the script :

(UndefinedFunctionError) function Jason.decode/2 is undefined (module Jason is not available)

I can see Jason dependency in my mix.exs file but it doesn’t seem to be working inside priv/repo/seeds.exs file. Or is there any other way / common patterns to seed phoenix app database from external file (json/csv) ?