diff --git a/proto/message.py b/proto/message.py
index 253e6240..7232d42f 100644
--- a/proto/message.py
+++ b/proto/message.py
@@ -376,7 +376,9 @@ def to_json(
         use_integers_for_enums=True,
         including_default_value_fields=True,
         preserving_proto_field_name=False,
+        sort_keys=False,
         indent=2,
+        float_precision=None,
     ) -> str:
         """Given a message instance, serialize it to json
 
@@ -389,10 +391,13 @@ def to_json(
             preserving_proto_field_name (Optional(bool)): An option that
                 determines whether field name representations preserve
                 proto case (snake_case) or use lowerCamelCase. Default is False.
-            indent: The JSON object will be pretty-printed with this indent level.
+            sort_keys (Optional(bool)): If True, then the output will be sorted by field names.
+                Default is False.
+            indent (Optional(int)): The JSON object will be pretty-printed with this indent level.
                 An indent level of 0 or negative will only insert newlines.
                 Pass None for the most compact representation without newlines.
-
+            float_precision (Optional(int)): If set, use this to specify float field valid digits.
+                Default is None.
         Returns:
             str: The json string representation of the protocol buffer.
         """
@@ -401,7 +406,9 @@ def to_json(
             use_integers_for_enums=use_integers_for_enums,
             including_default_value_fields=including_default_value_fields,
             preserving_proto_field_name=preserving_proto_field_name,
+            sort_keys=sort_keys,
             indent=indent,
+            float_precision=float_precision,
         )
 
     def from_json(cls, payload, *, ignore_unknown_fields=False) -> "Message":
@@ -428,6 +435,7 @@ def to_dict(
         use_integers_for_enums=True,
         preserving_proto_field_name=True,
         including_default_value_fields=True,
+        float_precision=None,
     ) -> "Message":
         """Given a message instance, return its representation as a python dict.
 
@@ -443,6 +451,8 @@ def to_dict(
             including_default_value_fields (Optional(bool)): An option that
                 determines whether the default field values should be included in the results.
                 Default is True.
+            float_precision (Optional(int)): If set, use this to specify float field valid digits.
+                Default is None.
 
         Returns:
             dict: A representation of the protocol buffer using pythonic data structures.
@@ -454,6 +464,7 @@ def to_dict(
             including_default_value_fields=including_default_value_fields,
             preserving_proto_field_name=preserving_proto_field_name,
             use_integers_for_enums=use_integers_for_enums,
+            float_precision=float_precision,
         )
 
     def copy_from(cls, instance, other):
diff --git a/tests/test_json.py b/tests/test_json.py
index 93ca936c..e94e935a 100644
--- a/tests/test_json.py
+++ b/tests/test_json.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import pytest
+import re
 
 import proto
 from google.protobuf.json_format import MessageToJson, Parse, ParseError
@@ -172,3 +173,26 @@ class Squid(proto.Message):
     s_two = Squid.from_json(j)
 
     assert s == s_two
+
+
+def test_json_sort_keys():
+    class Squid(proto.Message):
+        name = proto.Field(proto.STRING, number=1)
+        mass_kg = proto.Field(proto.INT32, number=2)
+
+    s = Squid(name="Steve", mass_kg=20)
+    j = Squid.to_json(s, sort_keys=True, indent=None)
+
+    assert re.search(r"massKg.*name", j)
+
+
+# TODO: https://github.com/googleapis/proto-plus-python/issues/390
+def test_json_float_precision():
+    class Squid(proto.Message):
+        name = proto.Field(proto.STRING, number=1)
+        mass_kg = proto.Field(proto.FLOAT, number=2)
+
+    s = Squid(name="Steve", mass_kg=3.14159265)
+    j = Squid.to_json(s, float_precision=3, indent=None)
+
+    assert j == '{"name": "Steve", "massKg": 3.14}'
diff --git a/tests/test_message.py b/tests/test_message.py
index 3146f0bb..983cde82 100644
--- a/tests/test_message.py
+++ b/tests/test_message.py
@@ -271,6 +271,17 @@ class Color(proto.Enum):
     assert new_s == s
 
 
+# TODO: https://github.com/googleapis/proto-plus-python/issues/390
+def test_serialize_to_dict_float_precision():
+    class Squid(proto.Message):
+        mass_kg = proto.Field(proto.FLOAT, number=1)
+
+    s = Squid(mass_kg=3.14159265)
+
+    s_dict = Squid.to_dict(s, float_precision=3)
+    assert s_dict["mass_kg"] == 3.14
+
+
 def test_unknown_field_deserialize():
     # This is a somewhat common setup: a client uses an older proto definition,
     # while the server sends the newer definition. The client still needs to be