diff --git a/README.md b/README.md
index c6f775f..823d86c 100644
--- a/README.md
+++ b/README.md
@@ -117,6 +117,13 @@ const { data } = await tf.patch('https://api.example.com/users/123', {
   title: 'Director of Engineering'
 })
 
+// PATCH request
+const { data } = await tf.patch('https://api.example.com/users/123', {
+  body: {
+    title: 'Director of Engineering'
+  }
+})
+
 // DELETE request
 const { data, response } = await tf.delete('https://api.example.com/users/123')
 ```
@@ -355,4 +362,4 @@ MIT License - see [LICENSE](LICENSE) for details.
 
 ---
 
-**TypedFetch**: Because life's too short for complex HTTP clients. 🚀
\ No newline at end of file
+**TypedFetch**: Because life's too short for complex HTTP clients. 🚀
diff --git a/src/core/resource-builder.ts b/src/core/resource-builder.ts
index 6706f37..0b7aa64 100644
--- a/src/core/resource-builder.ts
+++ b/src/core/resource-builder.ts
@@ -70,8 +70,8 @@ export interface ResourceBuilderOptions {
 }
 
 interface ResourceRequester {
-  request(method: string, url: string, init?: RequestInit, bodySample?: unknown): Promise<{
-    data: any
+  request<T>(method: string, url: string, init?: RequestInit, bodySample?: unknown): Promise<{
+    data: T
     response: Response
   }>
 }
@@ -85,10 +85,21 @@ export function createResource<TDefinition extends ResourceDefinition>(
   const normalizedBase = normalizePath(basePath, options.trailingSlash)
   const resource: Record<string, any> = {}
 
-  for (const [name, config] of Object.entries(definition)) {
-    resource[name] = async (
-      args: ResourceCallArgs<any, Record<string, string | number>, Record<string, unknown>> = {}
-    ) => {
+  for (const name of Object.keys(definition) as Array<keyof TDefinition>) {
+    type Config = TDefinition[typeof name]
+    type BodyType = Config extends ResourceMethodConfig<any, infer TBody, any, any> ? TBody : never
+    type ParamsType = Config extends ResourceMethodConfig<any, any, infer TParams, any>
+      ? TParams
+      : Record<string, string | number>
+    type QueryType = Config extends ResourceMethodConfig<any, any, any, infer TQuery>
+      ? TQuery
+      : Record<string, unknown>
+    type ResponseType = Config extends ResourceMethodConfig<infer TResponse, any, any, any>
+      ? TResponse
+      : unknown
+    const config = definition[name] as Config
+
+    resource[name as string] = async (args: ResourceCallArgs<BodyType, ParamsType, QueryType> = {}) => {
       const method = (config.method || 'GET').toUpperCase()
       const path = joinPaths(normalizedBase, config.path, options.trailingSlash)
       const resolvedPath = applyParams(path, args.params)
@@ -100,12 +111,12 @@ export function createResource<TDefinition extends ResourceDefinition>(
       const finalUrl = `${resolvedPath}${query}`
 
       const shouldUseJson = config.json ?? true
-      const serializer = config.serializeBody
+      const serializer = config.serializeBody as ((body: BodyType) => BodyInit | undefined) | undefined
       const hasBody = args.body !== undefined
       const prepared = hasBody
         ? serializer
-          ? { bodyInit: serializer(args.body), sample: args.body }
-          : prepareBodyPayload(args.body, { json: shouldUseJson })
+          ? { bodyInit: serializer(args.body as BodyType), sample: args.body }
+          : prepareBodyPayload(args.body as BodyType, { json: shouldUseJson })
         : undefined
 
       const init: RequestInit = {
@@ -120,7 +131,7 @@ export function createResource<TDefinition extends ResourceDefinition>(
         init.body = prepared?.bodyInit ?? null
       }
 
-      const result = await requester.request(
+      const result = await requester.request<ResponseType>(
         method,
         finalUrl,
         init,
@@ -132,7 +143,7 @@ export function createResource<TDefinition extends ResourceDefinition>(
           response: result.response
         }
       }
-      return result as { data: unknown; response: Response }
+      return result
     }
   }
 
diff --git a/src/core/typed-fetch.ts b/src/core/typed-fetch.ts
index d423a0b..e13a278 100644
--- a/src/core/typed-fetch.ts
+++ b/src/core/typed-fetch.ts
@@ -91,7 +91,7 @@ export class RevolutionaryTypedFetch<TEndpoints extends EndpointTypeMap = Endpoi
    */
   create(config: TypedFetchConfig): RevolutionaryTypedFetch<TEndpoints> {
     const mergedConfig = mergeConfig(this.config, config)
-    return new RevolutionaryTypedFetch(mergedConfig)
+    return new RevolutionaryTypedFetch<TEndpoints>(mergedConfig)
   }
   
   // REAL runtime type tracking
@@ -237,7 +237,7 @@ export class RevolutionaryTypedFetch<TEndpoints extends EndpointTypeMap = Endpoi
   ): ResourceInstance<TDefinition> {
     return createResource(this, path, definition, options)
   }
-  
+
   private resolveUrl(url: string): string {
     // Use baseURL from config or instance
     const baseURL = this.config.request.baseURL || this.baseURL
@@ -1182,4 +1182,4 @@ export class RevolutionaryTypedFetch<TEndpoints extends EndpointTypeMap = Endpoi
     
     return value * (multipliers[unit] || 1)
   }
-}
\ No newline at end of file
+}
diff --git a/tests/body-utils.test.ts b/tests/body-utils.test.ts
index f38baef..ee4dc98 100644
--- a/tests/body-utils.test.ts
+++ b/tests/body-utils.test.ts
@@ -1,5 +1,4 @@
 import { describe, expect, it } from 'vitest'
-
 import { mergePartialConfig, prepareBodyPayload, resolveBodyArgs } from '../src/core/body-utils.js'
 import type { TypedFetchConfig } from '../src/types/config.js'