Erlang : Tuple List into JSON

Question

I have a list of tuples which are http headers. I want to convert the list to a JSON object. I try mochijson2 but to no avail.

So I have the following :

Answer 1

You need to convert those strings inside there into binary before you send it to the encoder. The mochijson2 encoder just considers this as a list of integers and outputs it as an array. So mochijson2 needs you to convert{'key', "val"} into {'key', <<"val">>}

Try this in your code:

Original = [
  {'Accept-Charset',"ISO-8859-1,utf-8;q=0.7,*;q=0.7"}, 
  {'Accept-Encoding',"gzip,deflate"}
].
StingConverted = [ {X,list_to_binary(Y)} || {X,Y} <- Original ].
Output = mochijson2:encode(StingConverted).
io:format("This is correct: ~s~n", [Output]).

Or if you prefer using Funs:

Original = [
  {'Accept-Charset',"ISO-8859-1,utf-8;q=0.7,*;q=0.7"}, 
  {'Accept-Encoding',"gzip,deflate"}
].
ConvertFun = fun({X,Y}) -> {X,list_to_binary(Y)} end.
StingConverted = lists:map(ConvertFun, Original).
Output = mochijson2:encode(StingConverted).
io:format("This is correct: ~s~n", [Output]).