diff --git a/app/src/confgen/parsers.py b/app/src/confgen/parsers.py
new file mode 100644
index 0000000..1a913e0
--- /dev/null
+++ b/app/src/confgen/parsers.py
@@ -0,0 +1,149 @@
+"""Configuration parsers for JSON, YAML, and TOML formats."""
+
+import json
+from pathlib import Path
+from typing import Any
+import sys
+
+
+class ConfigParser:
+    """Parser for different configuration formats."""
+
+    SUPPORTED_FORMATS = ("json", "yaml", "toml")
+
+    def __init__(self):
+        if sys.version_info >= (3, 11):
+            import tomllib
+
+            self.toml_module = tomllib
+            self.toml_loads = tomllib.loads
+        else:
+            self.toml_module = None
+            self.toml_loads = None
+
+    def detect_format(self, content: str) -> str:
+        """Detect the format of configuration content."""
+        content = content.strip()
+
+        if content.startswith("{") or content.startswith("["):
+            try:
+                json.loads(content)
+                return "json"
+            except json.JSONDecodeError:
+                pass
+
+        if content.startswith("#") or content.startswith("---"):
+            return "yaml"
+
+        import yaml
+        try:
+            yaml.safe_load(content)
+            return "yaml"
+        except yaml.YAMLError:
+            pass
+
+        if self.toml_loads:
+            try:
+                self.toml_loads(content)
+                return "toml"
+            except Exception:
+                pass
+
+        return "yaml"
+
+    def detect_format_from_path(self, path: str) -> str:
+        """Detect format from file extension."""
+        ext = Path(path).suffix.lower()
+        format_map = {
+            ".json": "json",
+            ".yaml": "yaml",
+            ".yml": "yaml",
+            ".toml": "toml",
+        }
+        return format_map.get(ext, "yaml")
+
+    def parse(self, content: str, format: str | None = None) -> dict[str, Any]:
+        """Parse configuration content."""
+        fmt = format or self.detect_format(content)
+
+        if fmt == "json":
+            return self.parse_json(content)
+        elif fmt == "toml":
+            return self.parse_toml(content)
+        else:
+            return self.parse_yaml(content)
+
+    def parse_json(self, content: str) -> dict[str, Any]:
+        """Parse JSON configuration."""
+        try:
+            return json.loads(content)
+        except json.JSONDecodeError as e:
+            raise ValueError(f"Invalid JSON: {e}")
+
+    def parse_yaml(self, content: str) -> dict[str, Any]:
+        """Parse YAML configuration."""
+        import yaml
+        try:
+            return yaml.safe_load(content) or {}
+        except yaml.YAMLError as e:
+            raise ValueError(f"Invalid YAML: {e}")
+
+    def parse_toml(self, content: str) -> dict[str, Any]:
+        """Parse TOML configuration."""
+        if not self.toml_loads:
+            raise ValueError("TOML parsing not available. Install 'tomli' for Python < 3.11")
+        try:
+            return self.toml_loads(content)
+        except Exception as e:
+            raise ValueError(f"Invalid TOML: {e}")
+
+    def to_json(self, data: dict[str, Any], indent: int = 2) -> str:
+        """Convert data to JSON format."""
+        return json.dumps(data, indent=indent, ensure_ascii=False)
+
+    def to_yaml(self, data: dict[str, Any], indent: int = 2) -> str:
+        """Convert data to YAML format."""
+        import yaml
+        return yaml.dump(data, indent=indent, allow_unicode=True, sort_keys=False)
+
+    def to_toml(self, data: dict[str, Any]) -> str:
+        """Convert data to TOML format."""
+        try:
+            import tomli_w
+            return tomli_w.dumps(data)
+        except ImportError:
+            pass
+        
+        try:
+            import tomlkit
+            return tomlkit.dumps(data)
+        except ImportError:
+            pass
+        
+        raise ValueError("TOML output not available. Install 'tomli-w' or 'tomlkit'")
+
+    def load_file(self, path: str) -> dict[str, Any]:
+        """Load and parse a configuration file."""
+        fmt = self.detect_format_from_path(path)
+        with open(path) as f:
+            content = f.read()
+        return self.parse(content, fmt)
+
+    def save_file(
+        self,
+        path: str,
+        data: dict[str, Any],
+        format: str | None = None,
+    ) -> None:
+        """Save data to a configuration file."""
+        fmt = format or self.detect_format_from_path(path)
+
+        if fmt == "json":
+            content = self.to_json(data)
+        elif fmt == "toml":
+            content = self.to_toml(data)
+        else:
+            content = self.to_yaml(data)
+
+        Path(path).parent.mkdir(parents=True, exist_ok=True)
+        Path(path).write_text(content)