diff --git a/Sources/SwiftRequest/ServiceExecutor.swift b/Sources/SwiftRequest/ServiceExecutor.swift
index a614480..d2dba37 100644
--- a/Sources/SwiftRequest/ServiceExecutor.swift
+++ b/Sources/SwiftRequest/ServiceExecutor.swift
@@ -2,9 +2,13 @@ import Foundation
 
 public protocol ServiceExecutor {
     func execute(_ request: Request) async throws -> (Data, HTTPURLResponse)
+    var jsonDecoder: JSONDecoder? { get }
 }
 
 extension ServiceExecutor {
+    public var jsonDecoder: JSONDecoder? {
+        nil
+    }
     public func callAsFunction<Output: Decodable>(_ request: Request) async throws -> Output {
         let (output, _): (Output, _) = try await self(request)
         return output
@@ -12,7 +16,7 @@ extension ServiceExecutor {
     
     public func callAsFunction<Output: Decodable>(_ request: Request) async throws -> (Output, HTTPURLResponse) {
         let (data, response): (Data, HTTPURLResponse) = try await self.execute(request)
-        let output = try JSONDecoder().decode(Output.self, from: data)
+        let output = try (jsonDecoder ?? JSONDecoder()).decode(Output.self, from: data)
         return (output, response)
     }