diff --git a/src/jsx_config.erl b/src/jsx_config.erl
index 9c90aec..183dbbf 100644
--- a/src/jsx_config.erl
+++ b/src/jsx_config.erl
@@ -65,11 +65,6 @@ parse_config([relax|Rest], Config) ->
         comments = true,
         ignored_bad_escapes = true
     });
-parse_config([{pre_encode, Encoder}|Rest] = Options, Config) when is_function(Encoder, 1) ->
-    case Config#config.pre_encode of
-        false -> parse_config(Rest, Config#config{pre_encode=Encoder})
-        ; _ -> erlang:error(badarg, [Options, Config])
-    end;
 parse_config([{error_handler, ErrorHandler}|Rest] = Options, Config) when is_function(ErrorHandler, 3) ->
     case Config#config.error_handler of
         false -> parse_config(Rest, Config#config{error_handler=ErrorHandler})
@@ -81,11 +76,6 @@ parse_config([{incomplete_handler, IncompleteHandler}|Rest] = Options, Config) w
         ; _ -> erlang:error(badarg, [Options, Config])
     end;
 %% deprecated flags
-parse_config([{pre_encoder, Encoder}|Rest] = Options, Config) when is_function(Encoder, 1) ->
-    case Config#config.pre_encode of
-        false -> parse_config(Rest, Config#config{pre_encode=Encoder})
-        ; _ -> erlang:error(badarg, [Options, Config])
-    end;
 parse_config([loose_unicode|Rest], Config) ->
     parse_config(Rest, Config#config{replaced_bad_utf8=true});
 parse_config([escape_forward_slash|Rest], Config) ->
@@ -104,8 +94,7 @@ parse_config(Options, Config) ->
 
 config_to_list(Config) ->
     lists:map(
-        fun ({pre_encode, F}) -> {pre_encode, F};
-            ({error_handler, F}) -> {error_handler, F};
+        fun ({error_handler, F}) -> {error_handler, F};
             ({incomplete_handler, F}) -> {incomplete_handler, F};
             ({Key, true}) -> Key
         end,
@@ -128,11 +117,9 @@ valid_flags() ->
         ignored_bad_escapes,
         explicit_end,
         relax,
-        pre_encode,
         error_handler,
         incomplete_handler,
         %% deprecated flags
-        pre_encoder,            %% pre_encode
         loose_unicode,          %% replaced_bad_utf8
         escape_forward_slash,   %% escaped_forward_slashes
         single_quotes,          %% single_quoted_strings
@@ -202,7 +189,6 @@ config_test_() ->
         },
         {"deprecated flags", ?_assertEqual(
             #config{
-                pre_encode=fun lists:length/1,
                 replaced_bad_utf8=true,
                 escaped_forward_slashes=true,
                 single_quoted_strings=true,
@@ -211,7 +197,6 @@ config_test_() ->
                 ignored_bad_escapes=true
             },
             parse_config([
-                {pre_encoder, fun lists:length/1},
                 loose_unicode,
                 escape_forward_slash,
                 single_quotes,
@@ -220,17 +205,6 @@ config_test_() ->
                 ignore_bad_escapes
             ])
         )},
-        {"pre_encode flag", ?_assertEqual(
-            #config{pre_encode=fun lists:length/1},
-            parse_config([{pre_encode, fun lists:length/1}])
-        )},
-        {"two pre_encoders defined", ?_assertError(
-            badarg,
-            parse_config([
-                {pre_encode, fun(_) -> true end},
-                {pre_encode, fun(_) -> false end}
-            ])
-        )},
         {"error_handler flag", ?_assertEqual(
             #config{error_handler=fun ?MODULE:fake_error_handler/3},
             parse_config([{error_handler, fun ?MODULE:fake_error_handler/3}])
@@ -287,10 +261,6 @@ config_to_list_test_() ->
                 }
             )
         )},
-        {"pre_encode", ?_assertEqual(
-            [{pre_encode, fun lists:length/1}],
-            config_to_list(#config{pre_encode=fun lists:length/1})
-        )},
         {"error handler", ?_assertEqual(
             [{error_handler, fun ?MODULE:fake_error_handler/3}],
             config_to_list(#config{error_handler=fun ?MODULE:fake_error_handler/3})
diff --git a/src/jsx_config.hrl b/src/jsx_config.hrl
index 642dcf5..502f103 100644
--- a/src/jsx_config.hrl
+++ b/src/jsx_config.hrl
@@ -8,7 +8,6 @@
     dirty_strings = false,
     ignored_bad_escapes = false,
     explicit_end = false,
-    pre_encode = false,
     error_handler = false,
     incomplete_handler = false
 }).
\ No newline at end of file
diff --git a/src/jsx_encoder.erl b/src/jsx_encoder.erl
index 05403d3..a68a957 100644
--- a/src/jsx_encoder.erl
+++ b/src/jsx_encoder.erl
@@ -52,7 +52,7 @@ encoder(Handler, State, Config) ->
 
 
 start(Term, {Handler, State}, Config) ->
-    try Handler:handle_event(end_json, value(pre_encode(Term, Config), {Handler, State}, Config))
+    try Handler:handle_event(end_json, value(Term, {Handler, State}, Config))
     catch
         throw:Error -> Error;
         Type:Value -> erlang:Type(Value)
@@ -77,23 +77,16 @@ value(List, Handler, Config) when is_list(List) ->
 value(Term, Handler, Config) -> ?error(value, Term, Handler, Config).
 
 
-list_or_object([Term|Rest], {Handler, State}, Config) ->
-    case pre_encode(Term, Config) of
-        {K, V} when is_atom(K); is_binary(K) ->
-            object([{K, V}|Rest], {Handler, Handler:handle_event(start_object, State)}, Config)
-        ; T ->
-            list([T|Rest], {Handler, Handler:handle_event(start_array, State)}, Config)
-    end.
+list_or_object([{K, V}|Rest], {Handler, State}, Config) when is_atom(K); is_binary(K) ->
+    object([{K, V}|Rest], {Handler, Handler:handle_event(start_object, State)}, Config);
+list_or_object(Terms, {Handler, State}, Config) when is_list(Terms) ->
+    list(Terms, {Handler, Handler:handle_event(start_array, State)}, Config).
 
 
 object([{Key, Value}, Next|Rest], {Handler, State}, Config) when is_atom(Key); is_binary(Key) ->
-    V = pre_encode(Value, Config),
-    object(
-        [pre_encode(Next, Config)|Rest],
-        {
-            Handler,
+    object([Next|Rest], {Handler,
             value(
-                V,
+                Value,
                 {Handler, Handler:handle_event({key, clean_string(fix_key(Key), {Handler, State}, Config)}, State)},
                 Config
             )
@@ -106,7 +99,7 @@ object([{Key, Value}], {Handler, State}, Config) when is_atom(Key); is_binary(Ke
         {
             Handler,
             value(
-                pre_encode(Value, Config),
+                Value,
                 {Handler, Handler:handle_event({key, clean_string(fix_key(Key), {Handler, State}, Config)}, State)},
                 Config
             )
@@ -118,14 +111,11 @@ object(Term, Handler, Config) -> ?error(object, Term, Handler, Config).
 
 
 list([Value, Next|Rest], {Handler, State}, Config) ->
-    list([pre_encode(Next, Config)|Rest], {Handler, value(Value, {Handler, State}, Config)}, Config);
+    list([Next|Rest], {Handler, value(Value, {Handler, State}, Config)}, Config);
 list([Value], {Handler, State}, Config) ->
     list([], {Handler, value(Value, {Handler, State}, Config)}, Config);
 list([], {Handler, State}, _Config) -> Handler:handle_event(end_array, State).
 
-pre_encode(Value, #config{pre_encode=false}) -> Value;
-pre_encode(Value, Config) -> (Config#config.pre_encode)(Value).
-
 
 fix_key(Key) when is_atom(Key) -> fix_key(atom_to_binary(Key, utf8));
 fix_key(Key) when is_binary(Key) -> Key.
@@ -160,130 +150,6 @@ encode_test_() ->
 
 encode(Term, Config) -> start(Term, {jsx, []}, jsx_config:parse_config(Config)).
 
-pre_encoders_test_() ->
-    Term = [
-        {<<"object">>, [
-            {<<"literals">>, [true, false, null]},
-            {<<"strings">>, [<<"foo">>, <<"bar">>, <<"baz">>]},
-            {<<"numbers">>, [1, 1.0, 1.0e0]}
-        ]}
-    ],
-    [
-        {"no pre encode", ?_assertEqual(
-            [
-                start_object,
-                    {key, <<"object">>}, start_object,
-                        {key, <<"literals">>}, start_array,
-                            {literal, true}, {literal, false}, {literal, null},
-                        end_array,
-                        {key, <<"strings">>}, start_array,
-                            {string, <<"foo">>}, {string, <<"bar">>}, {string, <<"baz">>},
-                        end_array,
-                        {key, <<"numbers">>}, start_array,
-                            {integer, 1}, {float, 1.0}, {float, 1.0},
-                        end_array,
-                    end_object,
-                end_object,
-                end_json
-            ],
-            encode(Term, [])
-        )},
-        {"replace lists with empty lists", ?_assertEqual(
-            [
-                start_object,
-                    {key, <<"object">>}, start_object,
-                        {key, <<"literals">>}, start_array, end_array,
-                        {key, <<"strings">>}, start_array, end_array,
-                        {key, <<"numbers">>}, start_array, end_array,
-                    end_object,
-                end_object,
-                end_json
-            ],
-            encode(Term, [{pre_encode, fun(V) -> case V of [{_,_}|_] -> V; [{}] -> V; V when is_list(V) -> []; _ -> V end end}])
-        )},
-        {"replace objects with empty objects", ?_assertEqual(
-            [
-                start_object,
-                end_object,
-                end_json
-            ],
-            encode(Term, [{pre_encode, fun(V) -> case V of [{_,_}|_] -> [{}]; _ -> V end end}])
-        )},
-        {"replace all non-list and non_tuple values with false", ?_assertEqual(
-            [
-                start_object,
-                    {key, <<"object">>}, start_object,
-                        {key, <<"literals">>}, start_array,
-                            {literal, false}, {literal, false}, {literal, false},
-                        end_array,
-                        {key, <<"strings">>}, start_array,
-                            {literal, false}, {literal, false}, {literal, false},
-                        end_array,
-                        {key, <<"numbers">>}, start_array,
-                            {literal, false}, {literal, false}, {literal, false},
-                        end_array,
-                    end_object,
-                end_object,
-                end_json
-            ],
-            encode(Term, [{pre_encode, fun(V) when is_list(V); is_tuple(V) -> V; (_) -> false end}])
-        )},
-        {"replace all atoms with atom_to_list", ?_assertEqual(
-            [
-                start_object,
-                    {key, <<"object">>}, start_object,
-                        {key, <<"literals">>}, start_array,
-                            {string, <<"true">>}, {string, <<"false">>}, {string, <<"null">>},
-                        end_array,
-                        {key, <<"strings">>}, start_array,
-                            {string, <<"foo">>}, {string, <<"bar">>}, {string, <<"baz">>},
-                        end_array,
-                        {key, <<"numbers">>}, start_array,
-                            {integer, 1}, {float, 1.0}, {float, 1.0},
-                        end_array,
-                    end_object,
-                end_object,
-                end_json
-            ],
-            encode(Term, [{pre_encode, fun(V) when is_atom(V) -> unicode:characters_to_binary(atom_to_list(V)); (V) -> V end}])
-        )},
-        {"pre_encode tuple", ?_assertEqual(
-            [
-                start_array,
-                    {integer, 1}, {integer, 2}, {integer, 3},
-                end_array,
-                end_json
-            ],
-            encode({1, 2, 3}, [{pre_encode, fun(Tuple) when is_tuple(Tuple) -> tuple_to_list(Tuple); (V) -> V end}])
-        )},
-        {"pre_encode 2-tuples", ?_assertEqual(
-            [
-                start_object,
-                    {key, <<"two">>}, {integer, 2}, {key, <<"three">>}, {integer, 3},
-                end_object,
-                end_json
-            ],
-            encode([{two, 1}, {three, 2}], [{pre_encode, fun({K, V}) -> {K, V + 1}; (V) -> V end}])
-        )},
-        {"pre_encode one field record", ?_assertEqual(
-            [
-                start_object,
-                    {key, <<"bar">>}, {literal, false},
-                end_object,
-                end_json
-            ],
-            encode([{foo, bar}], [{pre_encode, fun({foo, V}) -> {V, undefined}; (undefined) -> false; (V) -> V end}])
-        )},
-        {"pre_encode list", ?_assertEqual(
-            [
-                start_array,
-                    {integer, 2}, {integer, 3}, {integer, 4},
-                end_array,
-                end_json
-            ],
-            encode([1,2,3], [{pre_encode, fun(X) when is_integer(X) -> X + 1; (V) -> V end}])
-        )}
-    ].
 
 error_test_() ->
     [