diff --git a/README.md b/README.md
index 1a0555a..9cdc06d 100644
--- a/README.md
+++ b/README.md
@@ -130,7 +130,7 @@ export class TaskFetch extends OpenAPIRoute {
     },
     responses: {
       '200': {
-        description: "Task fetched successfully",
+        description: 'Task fetched successfully',
         schema: {
           metaData: {},
           task: Task,
diff --git a/src/openapi.ts b/src/openapi.ts
index 9a2a19a..5b58e50 100644
--- a/src/openapi.ts
+++ b/src/openapi.ts
@@ -66,7 +66,9 @@ export function OpenAPIRouter<
     })
   }
 
-  const router = Router({ base: options?.base, routes: options?.routes })
+  const routerToUse = options?.baseRouter || Router
+
+  const router = routerToUse({ base: options?.base, routes: options?.routes })
 
   const routerProxy: OpenAPIRouterType<RouteType, Args> = new Proxy(router, {
     // @ts-expect-error (we're adding an expected prop "path" to the get)
@@ -94,11 +96,9 @@ export function OpenAPIRouter<
             // Merge inner router definitions into outer router
             registry.merge(nestedRouter.registry)
           } else if (prop !== 'all') {
-            const parsedRoute =
-              (options?.base || '') +
-              route
-                .replace(/\/+(\/|$)/g, '$1') // strip double & trailing splash
-                .replace(/:(\w+)/g, '{$1}') // convert parameters into openapi compliant
+            const parsedRoute = ((options?.base || '') + route)
+              .replaceAll(/\/+(\/|$)/g, '$1') // strip double & trailing splash
+              .replaceAll(/:(\w+)/g, '{$1}') // convert parameters into openapi compliant
 
             // @ts-ignore
             let schema: RouteConfig = undefined
@@ -139,7 +139,11 @@ export function OpenAPIRouter<
                   // TODO: make sure this works
                   params: z.object(
                     params.reduce(
-                      (obj, item) => Object.assign(obj, { [item]: z.string() }),
+                      // matched parameters start with ':' so replace the first occurrence with nothing
+                      (obj, item) =>
+                        Object.assign(obj, {
+                          [item.replace(':', '')]: z.string(),
+                        }),
                       {}
                     )
                   ),
diff --git a/src/types.ts b/src/types.ts
index 76587df..fd7ca6d 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,10 +1,6 @@
 import { RouteEntry } from 'itty-router'
-import { OpenAPIObject } from 'openapi3-ts/oas31'
-import { AnyZodObject, ZodType } from 'zod'
-import {
-  ResponseConfig,
-  ZodRequestBody,
-} from '@asteasolutions/zod-to-openapi/dist/openapi-registry'
+import { ZodType } from 'zod'
+import { ResponseConfig } from '@asteasolutions/zod-to-openapi/dist/openapi-registry'
 import { RouteConfig } from '@asteasolutions/zod-to-openapi'
 import { OpenAPIObjectConfigV31 } from '@asteasolutions/zod-to-openapi/dist/v3.1/openapi-generator'
 import { OpenAPIObjectConfig } from '@asteasolutions/zod-to-openapi/dist/v3.0/openapi-generator'
@@ -20,6 +16,7 @@ export interface RouterOptions {
   raiseUnknownParameters?: boolean
   generateOperationIds?: boolean
   openapiVersion?: '3' | '3.1'
+  baseRouter?: any
 }
 
 export declare type RouteParameter = {