diff --git a/Sources/Decode/FlowArgument+Decode.swift b/Sources/Decode/FlowArgument+Decode.swift
index 4d685df..863c9fe 100644
--- a/Sources/Decode/FlowArgument+Decode.swift
+++ b/Sources/Decode/FlowArgument+Decode.swift
@@ -230,7 +230,7 @@ extension Flow.Argument: FlowCodable {
     }
 
     private func modelToDict<T: Encodable>(result: T) -> [String: Any]? {
-        guard let data = try? JSONEncoder().encode(result),
+        guard let data = try? flow.encoder.encode(result),
               let model = (try? JSONSerialization.jsonObject(with: data)) as? [String: Any]
         else {
             return nil
diff --git a/Sources/Flow.swift b/Sources/Flow.swift
index 6abe32c..963cbcc 100644
--- a/Sources/Flow.swift
+++ b/Sources/Flow.swift
@@ -38,6 +38,17 @@ public final class Flow {
     /// The access API client
     public private(set) var accessAPI: FlowAccessProtocol
 
+    internal var encoder: JSONEncoder {
+        let encoder = JSONEncoder()
+        encoder.outputFormatting = .sortedKeys
+        return encoder
+    }
+    
+    internal var decoder: JSONDecoder {
+        let decoder = JSONDecoder()
+        return decoder
+    }
+    
     /// Default access client will be HTTP Client
     init() {
         accessAPI = FlowHTTPAPI(chainID: chainID)
diff --git a/Sources/Models/FlowArgument.swift b/Sources/Models/FlowArgument.swift
index ce5c586..b0c2c75 100644
--- a/Sources/Models/FlowArgument.swift
+++ b/Sources/Models/FlowArgument.swift
@@ -35,8 +35,7 @@ public extension Flow {
 
         /// Encode argument into json data.
         public var jsonData: Data? {
-            let encoder = JSONEncoder()
-            guard let jsonData = try? encoder.encode(self) else {
+            guard let jsonData = try? flow.encoder.encode(self) else {
                 return nil
             }
             return jsonData