diff --git a/README.md b/README.md
index 6ccf220..62df85c 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,9 @@ For the full documentation, see the Python docstrings.
 
 ## Changelog
 
+### Version 0.2.0
+- support for specifying mutability when parsing a configuration
+
 ### Version 0.1.1
 - backward compatibility for Python < 3.12: in Python < 3.12, f-string expression parts could not contain backslashes. The code contained an f-string with backslahes in the expression part. As an alternative to the f-string, normal strings are concatenated now.
 
diff --git a/pyproject.toml b/pyproject.toml
index 341633c..7b3ad2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,6 +4,6 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "jcloud-config-parser"
-version = "0.1.1"
+version = "0.2.0"
 description = "A configuration file parser."
 license = "Apache-2.0"
\ No newline at end of file
diff --git a/src/jcloud_config_parser/_configuration.py b/src/jcloud_config_parser/_configuration.py
index d62982b..9fd5fba 100644
--- a/src/jcloud_config_parser/_configuration.py
+++ b/src/jcloud_config_parser/_configuration.py
@@ -40,7 +40,6 @@ class Configuration:
                 raise TypeError('configuration is immutable')
         return wrapper
 
-
     def _set(self, name: str, value: str) -> None:
         @self._mutate
         def _set(name: str, value: str) -> None:
diff --git a/src/jcloud_config_parser/ini.py b/src/jcloud_config_parser/ini.py
index 6fecfa7..e6bad64 100644
--- a/src/jcloud_config_parser/ini.py
+++ b/src/jcloud_config_parser/ini.py
@@ -14,7 +14,7 @@
 
 from __future__ import annotations
 import typing
-from ._configuration import Configuration
+from ._configuration import Configuration, set_mutability
 from .parse.ini import _COMMENT_PREFIXES, _QUOTATION_MARKS, parse_ini
 from .serialize.ini import serialize as serialize_ini
 
@@ -28,7 +28,7 @@ class INIConfiguration(Configuration):
         return iter({k: dict(v) if isinstance(v, INIConfigurationSection) else v for k, v in self._config.items()}.items())
 
     @classmethod
-    def from_string(cls, data: str | bytes, comment_prefixes: typing.Collection[str] = _COMMENT_PREFIXES, quotation_marks: typing.Collection[str] = _QUOTATION_MARKS, ignore_errors: bool = False, default: INIConfiguration = None):
+    def from_string(cls, data: str | bytes, comment_prefixes: typing.Collection[str] = _COMMENT_PREFIXES, quotation_marks: typing.Collection[str] = _QUOTATION_MARKS, ignore_errors: bool = False, default: INIConfiguration = None, mutable: bool = True):
         '''
         Parses INI configuration from a string and returns an instance of INIConfiguration.
 
@@ -44,6 +44,8 @@ class INIConfiguration(Configuration):
         :type ignore_errors: bool
         :param default: The default configuration.
         :type default: INIConfiguration
+        :param mutable: The mutability of the configuration
+        :type mutable: bool
 
         :raises INISyntaxError: If there is a syntax error in the INI configuration and ``ignore_errors`` is ``False``.
 
@@ -68,6 +70,8 @@ class INIConfiguration(Configuration):
                     if propk not in dict(configuration[section]).keys():
                         configuration[section][propk] = propv
 
+        set_mutability(configuration, mutable)
+
         return configuration
 
     def to_string(self, separator: str = '='):
diff --git a/src/jcloud_config_parser/json.py b/src/jcloud_config_parser/json.py
index e007209..99b596a 100644
--- a/src/jcloud_config_parser/json.py
+++ b/src/jcloud_config_parser/json.py
@@ -39,7 +39,7 @@ class JSONConfiguration(Configuration):
         return iter({k: v.value for k, v in self._config.items()}.items())
 
     @classmethod
-    def from_string(cls, data: str | bytes, ignore_errors: bool = False):
+    def from_string(cls, data: str | bytes, ignore_errors: bool = False, mutable: bool = True):
         '''
         Parses JSON configuration from a string and returns an instance of JSONConfiguration.
 
@@ -47,6 +47,8 @@ class JSONConfiguration(Configuration):
         :type data: str
         :param ignore_errors: If True, errors will be ignored.
         :type ignore_errors: bool
+        :param mutable: The mutability of the configuration
+        :type mutable: bool
 
         :raises JSONValueSyntaxError: If a value is invalid and ``ignore_errors`` is ``False``.
         :raises JSONObjectSyntaxError: If an object is invalid and ``ignore_errors`` is ``False``.
@@ -63,11 +65,11 @@ class JSONConfiguration(Configuration):
         try:
             data = parse_type(data).parse(data)
             if isinstance(data, JSONObject):
-                return cls({k: _configuration(v) for k, v in data.value.items()})
+                return cls({k: _configuration(v) for k, v in data.value.items()}, mutable = mutable)
             elif not ignore_errors:
                 raise JSONTypeError(f'expected object, got {data._type}. Use jcloud_config_parser.parse.json.parse_json to parse JSONs.')
         except:
             if ignore_errors:
-                return cls()
+                return cls(mutable = mutable)
             else:
                 raise
\ No newline at end of file
diff --git a/tests/ini/test_ini.py b/tests/ini/test_ini.py
index 5e969d8..2aead6d 100644
--- a/tests/ini/test_ini.py
+++ b/tests/ini/test_ini.py
@@ -94,4 +94,26 @@ def test_mutability():
         del config.key
         assert False, 'Expected TypeError'
     except TypeError:
-        pass
\ No newline at end of file
+        pass
+
+    configuration = '[section]\nkey=value'
+    config = INIConfiguration.from_string(configuration)
+    config.key1 = 'value1'
+
+    set_mutability(config, False)
+    try:
+        config.key2 = 'value2'
+        assert False, 'Expected TypeError'
+    except TypeError:
+        pass
+
+    config = INIConfiguration.from_string(configuration, mutable = False)
+
+    try:
+        config.key1 = 'value1'
+        assert False, 'Expected TypeError'
+    except TypeError:
+        pass
+
+    set_mutability(config, True)
+    config.key2 = 'value2'
\ No newline at end of file
diff --git a/tests/json/test_json.py b/tests/json/test_json.py
index 11d1e98..7327472 100644
--- a/tests/json/test_json.py
+++ b/tests/json/test_json.py
@@ -15,6 +15,7 @@
 from src.jcloud_config_parser.json import JSONConfiguration
 from src.jcloud_config_parser.exceptions import JSONObjectSyntaxError, JSONValueSyntaxError, JSONStringSyntaxError, JSONArraySyntaxError, EscapeSequenceSyntaxError
 from src.jcloud_config_parser import set_mutability
+from src.jcloud_config_parser.parse.json import JSONString
 
 def test_json_configuration():
     # Test valid JSON configuration parsing
@@ -224,7 +225,7 @@ def test_json_configuration():
         pass
 
 def test_mutability():
-    config = JSONConfiguration(mutable=False)
+    config = JSONConfiguration(mutable = False)
     try:
         config.key = 'value'
         assert False, 'Expected TypeError'
@@ -243,4 +244,27 @@ def test_mutability():
         del config.key
         assert False, 'Expected TypeError'
     except TypeError:
-        pass
\ No newline at end of file
+        pass
+
+    configuration = '{"key": "value"}'
+    config = JSONConfiguration.from_string(configuration)
+    config.key1 = JSONString("value1")
+    
+    set_mutability(config, False)
+
+    try:
+        config.key2 = JSONString('value2')
+        assert False, 'Expected TypeError'
+    except TypeError:
+        pass
+
+    config = JSONConfiguration.from_string(configuration, mutable = False)
+
+    try:
+        config.key1 = JSONString('value1')
+        assert False, 'Expected TypeError'
+    except TypeError:
+        pass
+
+    set_mutability(config, True)
+    config.key2 = JSONString('value2')
\ No newline at end of file