diff --git a/.gitignore b/.gitignore
index 231fd24..50a3a94 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ dist/
 build/
 .eggs/
 tags
+__pycache__/
+*.pyc
diff --git a/poorwsgi/wsgi.py b/poorwsgi/wsgi.py
index 605a579..7383bcd 100644
--- a/poorwsgi/wsgi.py
+++ b/poorwsgi/wsgi.py
@@ -33,6 +33,10 @@
 # check, if there is define filter in uri
 re_filter = re.compile(r'<(\w+)(:[^>]+)?>')
 
+# check for invalid route definitions with spaces
+# Matches: <{space}name, <name{space}: , <name{space}> , <name:{space}word, <name:filter{space}>
+re_invalid_filter = re.compile(r'<\s+\w+|<\w+\s+[:|>]|<\w+:\s+\w+|<\w+:[^>]+\s+>')
+
 # Supported authorization algorithms
 AUTH_DIGEST_ALGORITHMS = {
     'MD5': md5,
@@ -792,6 +796,16 @@ def set_route(self, uri: str, fun: Callable,
 
             app.set_route('/use/post', user_create, METHOD_POST)
         """
+        # Check for invalid spaces in route filter definitions
+        if re_invalid_filter.search(uri):
+            msg = (
+                f"Invalid route definition '{uri}': "
+                "Route filter definitions must not contain spaces. "
+                "Use '<name:filter>' format without any spaces. "
+                "Examples: '<id:int>', '<name:word>', '<value:float>'"
+            )
+            raise ValueError(msg)
+
         if re_filter.search(uri):
             r_uri = re_filter.sub(self.__regex, uri) + '$'
             converters = tuple((g[0], self.__converter(g[1]))
diff --git a/tests/test_route_validation.py b/tests/test_route_validation.py
new file mode 100644
index 0000000..56ddf1d
--- /dev/null
+++ b/tests/test_route_validation.py
@@ -0,0 +1,215 @@
+"""Unit tests for route filter validation."""
+import pytest
+
+from poorwsgi.wsgi import Application
+from poorwsgi.state import METHOD_GET
+
+
+def test_valid_route_no_filter():
+    """Test that routes without filters work correctly."""
+    app = Application('test_valid_no_filter')
+
+    @app.route('/api/users')
+    def handler(req):
+        return 'ok'
+
+    assert '/api/users' in app.routes
+
+
+def test_valid_route_with_int_filter():
+    """Test that routes with :int filter work correctly."""
+    app = Application('test_valid_int')
+
+    @app.route('/api/users/<id:int>')
+    def handler(req, id):  # noqa: A002
+        return 'ok'
+
+    # Route with filter should be in regular_routes
+    assert len(app.regular_routes) > 0
+
+
+def test_valid_route_with_word_filter():
+    """Test that routes with :word filter work correctly."""
+    app = Application('test_valid_word')
+
+    @app.route('/api/users/<name:word>')
+    def handler(req, name):
+        return 'ok'
+
+    assert len(app.regular_routes) > 0
+
+
+def test_valid_route_with_float_filter():
+    """Test that routes with :float filter work correctly."""
+    app = Application('test_valid_float')
+
+    @app.route('/api/values/<value:float>')
+    def handler(req, value):
+        return 'ok'
+
+    assert len(app.regular_routes) > 0
+
+
+def test_valid_route_with_uuid_filter():
+    """Test that routes with :uuid filter work correctly."""
+    app = Application('test_valid_uuid')
+
+    @app.route('/api/objects/<id:uuid>')
+    def handler(req, id):  # noqa: A002
+        return 'ok'
+
+    assert len(app.regular_routes) > 0
+
+
+def test_valid_route_with_hex_filter():
+    """Test that routes with :hex filter work correctly."""
+    app = Application('test_valid_hex')
+
+    @app.route('/api/codes/<code:hex>')
+    def handler(req, code):
+        return 'ok'
+
+    assert len(app.regular_routes) > 0
+
+
+def test_valid_route_with_multiple_filters():
+    """Test that routes with multiple filters work correctly."""
+    app = Application('test_valid_multiple')
+
+    @app.route('/api/<entity:word>/<id:int>')
+    def handler(req, entity, id):  # noqa: A002
+        return 'ok'
+
+    assert len(app.regular_routes) > 0
+
+
+def test_invalid_route_space_after_open_bracket():
+    """Test that space after < is rejected."""
+    app = Application('test_invalid_space_after_open')
+
+    with pytest.raises(ValueError, match=r'Invalid route definition.*must not contain spaces'):
+        @app.route('/api/< id:int>')
+        def handler(req, id):  # noqa: A002
+            return 'ok'
+
+
+def test_invalid_route_space_before_close_bracket():
+    """Test that space before > is rejected."""
+    app = Application('test_invalid_space_before_close')
+
+    with pytest.raises(ValueError, match='Invalid route definition'):
+        @app.route('/api/<id:int >')
+        def handler(req, id):  # noqa: A002
+            return 'ok'
+
+
+def test_invalid_route_space_after_name():
+    """Test that space after parameter name is rejected."""
+    app = Application('test_invalid_space_after_name')
+
+    with pytest.raises(ValueError, match='Invalid route definition'):
+        @app.route('/api/<id :int>')
+        def handler(req, id):  # noqa: A002
+            return 'ok'
+
+
+def test_invalid_route_space_after_colon():
+    """Test that space after : is rejected."""
+    app = Application('test_invalid_space_after_colon')
+
+    with pytest.raises(ValueError, match='Invalid route definition'):
+        @app.route('/api/<id: int>')
+        def handler(req, id):  # noqa: A002
+            return 'ok'
+
+
+def test_invalid_route_multiple_spaces():
+    """Test that multiple spaces are rejected."""
+    app = Application('test_invalid_multiple_spaces')
+
+    with pytest.raises(ValueError, match='Invalid route definition'):
+        @app.route('/api/< id : int >')
+        def handler(req, id):  # noqa: A002
+            return 'ok'
+
+
+def test_error_message_provides_examples():
+    """Test that error message includes helpful examples."""
+    app = Application('test_error_message')
+
+    with pytest.raises(ValueError, match='Invalid route definition') as exc_info:
+        @app.route('/api/<id :int>')
+        def handler(req, id):  # noqa: A002
+            return 'ok'
+
+    error_message = str(exc_info.value)
+    assert '<id:int>' in error_message
+    assert '<name:word>' in error_message
+    assert '<value:float>' in error_message
+
+
+def test_set_route_with_space_rejection():
+    """Test that set_route method also rejects spaces."""
+    app = Application('test_set_route_space')
+
+    def handler(req, id):  # noqa: A002
+        return 'ok'
+
+    with pytest.raises(ValueError, match='Invalid route definition'):
+        app.set_route('/api/< id:int>', handler, METHOD_GET)
+
+
+def test_route_with_no_filter_and_angle_brackets():
+    """Test that routes without filters but with <> in path work."""
+    app = Application('test_no_filter')
+
+    @app.route('/api/<id>')
+    def handler(req, id):  # noqa: A002
+        return 'ok'
+
+    # Route with <name> but no filter should work
+    assert len(app.regular_routes) > 0
+
+
+def test_custom_filter_no_spaces():
+    """Test that custom filters work without spaces."""
+    app = Application('test_custom_filter')
+    app.set_filter('custom', r'[a-z]+')
+
+    @app.route('/api/<value:custom>')
+    def handler(req, value):
+        return 'ok'
+
+    assert len(app.regular_routes) > 0
+
+
+def test_custom_filter_with_space_rejection():
+    """Test that custom filters reject spaces."""
+    app = Application('test_custom_filter_space')
+    app.set_filter('custom', r'[a-z]+')
+
+    with pytest.raises(ValueError, match='Invalid route definition'):
+        @app.route('/api/<value: custom>')
+        def handler(req, value):
+            return 'ok'
+
+
+def test_re_filter_no_spaces():
+    """Test that :re: filter works without spaces."""
+    app = Application('test_re_filter')
+
+    @app.route('/api/<value:re:[a-z]+>')
+    def handler(req, value):
+        return 'ok'
+
+    assert len(app.regular_routes) > 0
+
+
+def test_re_filter_with_space_rejection():
+    """Test that :re: filter rejects spaces before >."""
+    app = Application('test_re_filter_space')
+
+    with pytest.raises(ValueError, match='Invalid route definition'):
+        @app.route('/api/<value:re:[a-z]+ >')
+        def handler(req, value):
+            return 'ok'