diff --git a/jeeves/cli/cli.py b/jeeves/cli/cli.py
index 52e0461..fd5f693 100644
--- a/jeeves/cli/cli.py
+++ b/jeeves/cli/cli.py
@@ -1,3 +1,5 @@
+import os.path
+
 import click
 
 from jeeves.cli.echo import info, error, title, success
@@ -20,9 +22,15 @@ def main():
     help="Display output for flow",
 )
 def execute(defintinion_file, print_output):
+    extension = os.path.splitext(defintinion_file.name)[1][1:]
+
+    if not hasattr(FlowParser, f"from_{extension}"):
+        error(f"Extension {extension} is not supported")
+        exit(1)
+
     info(f"Running flow from {defintinion_file.name}")
 
-    flow = FlowParser.from_json(defintinion_file.read())
+    flow = getattr(FlowParser, f"from_{extension}")(defintinion_file.read())
 
     title(f"Running flow: {flow.name}")
     executor = Executor(flow)
diff --git a/jeeves/core/objects.py b/jeeves/core/objects.py
index 16e160d..15e20a6 100644
--- a/jeeves/core/objects.py
+++ b/jeeves/core/objects.py
@@ -1,12 +1,12 @@
 from typing import Any, Dict, List, Text, Optional
 from dataclasses import field
 
-from pydantic import BaseModel
+import pydantic
 
 from jeeves.core.registry import ActionRegistry
 
 
-class BaseObject(BaseModel):
+class BaseObject(pydantic.BaseModel):
     pass
 
 
@@ -18,7 +18,7 @@ class Result(BaseObject):
 class Task(BaseObject):
     name: Text
     type: Text
-    parameters: Dict[Any, Any]
+    parameters: Optional[Dict[Any, Any]] = None
 
     @property
     def action(self):
diff --git a/jeeves/core/parsers.py b/jeeves/core/parsers.py
index 7ba75c6..40a5679 100644
--- a/jeeves/core/parsers.py
+++ b/jeeves/core/parsers.py
@@ -1,4 +1,6 @@
+import json
 from typing import Any, Text, MutableMapping
+from pathlib import Path
 
 import toml
 
@@ -8,13 +10,25 @@ from jeeves.core.objects import Flow, BaseObject
 class ObjectParser:
     object: BaseObject = None
 
+    @classmethod
+    def from_dict(cls, serialized: MutableMapping[str, Any]) -> BaseObject:
+        return cls.object.parse_obj(serialized)
+
+    @classmethod
+    def to_dict(cls, obj: BaseObject) -> dict:
+        return obj.dict()
+
     @classmethod
     def from_json(cls, serialized: Text) -> BaseObject:
         return cls.object.parse_raw(serialized)
 
     @classmethod
-    def from_dict(cls, serialized: MutableMapping[str, Any]) -> BaseObject:
-        return cls.object.parse_obj(serialized)
+    def from_json_file(cls, path: Path) -> BaseObject:
+        return cls.object.parse_file(path)
+
+    @classmethod
+    def to_json(cls, obj: BaseObject) -> Text:
+        return json.dumps(cls.to_dict(obj))
 
     @classmethod
     def from_toml(cls, serialized: Text) -> BaseObject:
@@ -27,8 +41,8 @@ class ObjectParser:
         return cls.from_dict(dct)
 
     @classmethod
-    def to_dict(cls, obj: BaseObject) -> dict:
-        return obj.dict()
+    def to_toml(cls, obj: BaseObject) -> Text:
+        return toml.dumps(cls.to_dict(obj))
 
 
 class FlowParser(ObjectParser):
diff --git a/jeeves/core/tests/test_parsers.py b/jeeves/core/tests/test_parsers.py
index 87a4c16..431bee3 100644
--- a/jeeves/core/tests/test_parsers.py
+++ b/jeeves/core/tests/test_parsers.py
@@ -1,4 +1,11 @@
-from jeeves.core.objects import BaseObject
+# pylint: disable=no-member
+import os
+import json
+import tempfile
+
+import toml
+
+from jeeves.core.objects import Flow, BaseObject
 from jeeves.core.parsers import FlowParser
 from .factories import FlowFactory
 
@@ -15,11 +22,59 @@ EXPORTED_FLOW = {
 
 
 def test_parser_object_to_dict_ok():
-    obj = FlowFactory()
+    obj: Flow = FlowFactory()
     result = FlowParser.to_dict(obj)
-    obj = FlowParser.from_dict(result)
+    assert set(obj.fields).issubset(set(result))
 
 
 def test_parser_dict_to_object_ok():
     obj = FlowParser.from_dict(EXPORTED_FLOW)
+    assert isinstance(obj, Flow)
+
+
+########
+# JSON #
+########
+def test_parser_json_to_object_ok():
+    obj = FlowParser.from_json(json.dumps(EXPORTED_FLOW))
     assert isinstance(obj, BaseObject)
+
+
+def test_parser_json_file_to_object_ok():
+    export_file = tempfile.NamedTemporaryFile(delete=False, mode="w")
+    with export_file as handler:
+        handler.write(json.dumps(EXPORTED_FLOW))
+
+    obj = FlowParser.from_json_file(export_file.name)
+    assert isinstance(obj, BaseObject)
+    os.unlink(export_file.name)
+
+
+def test_parser_obj_to_json_ok():
+    obj: Flow = FlowFactory()
+    result = FlowParser.to_json(obj)
+    assert set(obj.fields).issubset(set(json.loads(result)))
+
+
+########
+# TOML #
+########
+def test_parser_toml_to_object_ok():
+    obj = FlowParser.from_toml(toml.dumps(EXPORTED_FLOW))
+    assert isinstance(obj, BaseObject)
+
+
+def test_parser_toml_file_to_object_ok():
+    export_file = tempfile.NamedTemporaryFile(delete=False, mode="w")
+    with export_file as handler:
+        handler.write(toml.dumps(EXPORTED_FLOW))
+
+    obj = FlowParser.from_toml_file(export_file.name)
+    assert isinstance(obj, BaseObject)
+    os.unlink(export_file.name)
+
+
+def test_parser_obj_to_toml_ok():
+    obj: Flow = FlowFactory()
+    result = FlowParser.to_toml(obj)
+    assert set(obj.fields).issubset(set(toml.loads(result)))