Output JSON response

Hi All,

Currently I have the list of companies in this format

companies= [
{“Please type employer name”, “”},
{“Google”, 2},
{“Accenture”, 3},
{“Microsoft”, 1},
{“Apple”, 4}
]

I want to output this in a JSON response.
I am trying with render function. But it is considering only the first tuple and throwing error.

(exit) an exception was raised:
** (Protocol.UndefinedError) protocol Jason.Encoder not implemented for {“Please type employer name”, “”}, of type Tuple, Jason.Encoder protocol must always be explicitly implemented. This protocol is implemented for the following type(s): MyFutureNow.TransferableBenefits, MyFutureNow.UntransferableBenefits, Ecto.Association.NotLoaded, Ecto.Schema.Metadata, Any, Atom, BitString, Date, DateTime, Decimal, Float, Integer, Jason.Fragment, List, Map, NaiveDateTime, Time

When I give normal string or simple map, it works fine. But how to give a list of tuples to render function to output as JSON response.

Please help.

TIA..