diff --git a/src/http_convert/models.py b/src/http_convert/models.py
new file mode 100644
index 0000000..7d791e8
--- /dev/null
+++ b/src/http_convert/models.py
@@ -0,0 +1,50 @@
+from pydantic import BaseModel, Field
+from typing import Optional, Dict, Any, List
+from enum import Enum
+
+
+class HttpMethod(str, Enum):
+    GET = "GET"
+    POST = "POST"
+    PUT = "PUT"
+    PATCH = "PATCH"
+    DELETE = "DELETE"
+    HEAD = "HEAD"
+    OPTIONS = "OPTIONS"
+
+
+class HTTPRequest(BaseModel):
+    method: HttpMethod = HttpMethod.GET
+    url: str
+    headers: Dict[str, str] = Field(default_factory=dict)
+    params: Dict[str, str] = Field(default_factory=dict)
+    body: Optional[str] = None
+    body_json: Optional[Dict[str, Any]] = None
+
+    def get_final_url(self) -> str:
+        if self.params:
+            param_str = "&".join(f"{k}={v}" for k, v in self.params.items())
+            separator = "&" if "?" in self.url else "?"
+            return f"{self.url}{separator}{param_str}"
+        return self.url
+
+
+class OutputFormat(str, Enum):
+    CURL = "curl"
+    HTTPie = "httpie"
+    FETCH = "fetch"
+    AXIOS = "axios"
+
+
+class InputFormat(str, Enum):
+    CURL = "curl"
+    HTTPie = "httpie"
+    FETCH = "fetch"
+    AXIOS = "axios"
+
+
+class ConversionResult(BaseModel):
+    original_format: InputFormat
+    target_format: OutputFormat
+    original_request: HTTPRequest
+    converted_code: str