diff --git a/src/merlee.ts b/src/merlee.ts
index 790914f..22d79f7 100644
--- a/src/merlee.ts
+++ b/src/merlee.ts
@@ -63,7 +63,7 @@ class Merlee {
   handler(options: HandlerOptions, callback: HandlerCallback) {
     const { path, method = 'get' } = options;
 
-    this.server.on('request', (req: Request, res: Response) => {
+    this.server.on('request', (req: Request<any>, res: Response) => {
       // error cannot set headers after they have been sent
       _static(req, res, this.options.static);
 
@@ -197,7 +197,7 @@ class Merlee {
         redirect,
       } as unknown as Response;
 
-      const request = { ...req, params, param } as unknown as Request;
+      const request = { ...req, params, param } as unknown as Request<any>;
 
       // request is from router
       if (typeof options != 'function') {
diff --git a/src/types/index.ts b/src/types/index.ts
index ce37df4..7167a00 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -7,15 +7,15 @@ export interface Response extends ServerResponse {
   sendFile: (file: string, status: number) => void;
   redirect: (path: string) => void;
 }
-export interface Request extends IncomingMessage {
+export interface Request<T extends any> extends IncomingMessage {
   query: unknown;
   params: Record<string, string>;
   param: (name: string) => string;
-  body?: any;
+  body?: T;
 }
 
 export interface HandlerCallback {
-  (req: Request, res: Response): void;
+  (req: Request<any>, res: Response): void;
 }
 
 type RequestMethod =
@@ -36,7 +36,7 @@ export interface HandlerOptions {
 
 export type NextFunction = (err?: Error) => void;
 export type HandlerFunction = (
-  req: Request,
+  req: Request<any>,
   res: Response,
   next?: NextFunction
 ) => void;