diff --git a/src/core/validator.py b/src/core/validator.py
new file mode 100644
index 0000000..8055870
--- /dev/null
+++ b/src/core/validator.py
@@ -0,0 +1,145 @@
+from typing import Any, Dict, List, Optional, Tuple
+from src.models.request import RequestValidation
+
+
+class ValidationError:
+    def __init__(self, field: str, message: str, location: str):
+        self.field = field
+        self.message = message
+        self.location = location
+
+    def to_dict(self) -> Dict[str, Any]:
+        return {
+            "field": self.field,
+            "message": self.message,
+            "location": self.location
+        }
+
+
+class Validator:
+    def __init__(self, validation_rules: Optional[RequestValidation] = None):
+        self.rules = validation_rules
+
+    def validate(
+        self,
+        body: Optional[Any] = None,
+        query: Optional[Dict[str, str]] = None,
+        headers: Optional[Dict[str, str]] = None,
+        path: Optional[Dict[str, str]] = None
+    ) -> Tuple[bool, List[ValidationError]]:
+        errors = []
+        if self.rules:
+            if self.rules.body:
+                body_errors = self._validate_object(body, self.rules.body, "body")
+                errors.extend(body_errors)
+            if self.rules.query:
+                query_errors = self._validate_object(query or {}, self.rules.query, "query")
+                errors.extend(query_errors)
+            if self.rules.headers:
+                headers_errors = self._validate_object(headers or {}, self.rules.headers, "headers")
+                errors.extend(headers_errors)
+            if self.rules.path:
+                path_errors = self._validate_object(path or {}, self.rules.path, "path")
+                errors.extend(path_errors)
+        return len(errors) == 0, errors
+
+    def _validate_object(
+        self,
+        data: Any,
+        schema: Dict[str, Any],
+        location: str
+    ) -> List[ValidationError]:
+        errors = []
+        if not isinstance(data, dict):
+            errors.append(ValidationError("root", f"Expected object for {location}", location))
+            return errors
+        type_hint = schema.get("type")
+        if type_hint and type_hint != "object":
+            errors.append(ValidationError("root", f"Expected type '{type_hint}' for {location}", location))
+        required_fields = schema.get("required", [])
+        for field in required_fields:
+            if field not in data:
+                errors.append(ValidationError(field, f"Field '{field}' is required", location))
+        properties = schema.get("properties", {})
+        for field, prop_schema in properties.items():
+            if field in data:
+                field_errors = self._validate_field(data[field], prop_schema, field, location)
+                errors.extend(field_errors)
+        return errors
+
+    def _validate_field(
+        self,
+        value: Any,
+        schema: Dict[str, Any],
+        field_name: str,
+        location: str
+    ) -> List[ValidationError]:
+        errors = []
+        type_hint = schema.get("type")
+        if type_hint:
+            type_map = {
+                "string": str,
+                "integer": int,
+                "number": (int, float),
+                "boolean": bool,
+                "array": list,
+                "object": dict
+            }
+            expected_type = type_map.get(type_hint)
+            if expected_type and not isinstance(value, expected_type):
+                errors.append(ValidationError(
+                    field_name,
+                    f"Expected {type_hint}, got {type(value).__name__}",
+                    location
+                ))
+        min_length = schema.get("minLength")
+        if min_length and isinstance(value, str) and len(value) < min_length:
+            errors.append(ValidationError(
+                field_name,
+                f"String must be at least {min_length} characters",
+                location
+            ))
+        max_length = schema.get("maxLength")
+        if max_length and isinstance(value, str) and len(value) > max_length:
+            errors.append(ValidationError(
+                field_name,
+                f"String must be at most {max_length} characters",
+                location
+            ))
+        minimum = schema.get("minimum")
+        if minimum is not None and isinstance(value, (int, float)) and value < minimum:
+            errors.append(ValidationError(
+                field_name,
+                f"Value must be at least {minimum}",
+                location
+            ))
+        maximum = schema.get("maximum")
+        if maximum is not None and isinstance(value, (int, float)) and value > maximum:
+            errors.append(ValidationError(
+                field_name,
+                f"Value must be at most {maximum}",
+                location
+            ))
+        pattern = schema.get("pattern")
+        if pattern and isinstance(value, str):
+            import re
+            if not re.match(pattern, value):
+                errors.append(ValidationError(
+                    field_name,
+                    f"Value does not match pattern {pattern}",
+                    location
+                ))
+        format_type = schema.get("format")
+        if format_type == "email" and isinstance(value, str):
+            import re
+            email_pattern = r"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$"
+            if not re.match(email_pattern, value):
+                errors.append(ValidationError(field_name, "Invalid email format", location))
+        return errors
+
+    def format_errors(self, errors: List[ValidationError]) -> Dict[str, Any]:
+        return {
+            "valid": False,
+            "error_count": len(errors),
+            "errors": [e.to_dict() for e in errors]
+        }