diff --git a/modules/openapi-generator/src/main/resources/swift5/Extensions.mustache b/modules/openapi-generator/src/main/resources/swift5/Extensions.mustache
index 92d0d1f95af7..7a93772f33d3 100644
--- a/modules/openapi-generator/src/main/resources/swift5/Extensions.mustache
+++ b/modules/openapi-generator/src/main/resources/swift5/Extensions.mustache
@@ -159,6 +159,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/modules/openapi-generator/src/main/resources/swift6/Extensions.mustache b/modules/openapi-generator/src/main/resources/swift6/Extensions.mustache
index 0a3670cca2c2..7145643cddc4 100644
--- a/modules/openapi-generator/src/main/resources/swift6/Extensions.mustache
+++ b/modules/openapi-generator/src/main/resources/swift6/Extensions.mustache
@@ -149,6 +149,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index 286c5001ff84..2082fb065ea4 100644
--- a/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/alamofireLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/asyncAwaitLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/asyncAwaitLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index 286c5001ff84..2082fb065ea4 100644
--- a/samples/client/petstore/swift5/asyncAwaitLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/asyncAwaitLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index 286c5001ff84..2082fb065ea4 100644
--- a/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/combineLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index 286c5001ff84..2082fb065ea4 100644
--- a/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/default/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index 286c5001ff84..2082fb065ea4 100644
--- a/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/objcCompatible/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/oneOf/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/oneOf/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index 286c5001ff84..2082fb065ea4 100644
--- a/samples/client/petstore/swift5/oneOf/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/oneOf/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index c90549a49655..c6b80d8ea434 100644
--- a/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -158,6 +158,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index 5ffd8f3a2fb7..315305c59957 100644
--- a/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/resultLibrary/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/urlsessionLibrary/Sources/PetstoreClient/Extensions.swift b/samples/client/petstore/swift5/urlsessionLibrary/Sources/PetstoreClient/Extensions.swift
index 286c5001ff84..2082fb065ea4 100644
--- a/samples/client/petstore/swift5/urlsessionLibrary/Sources/PetstoreClient/Extensions.swift
+++ b/samples/client/petstore/swift5/urlsessionLibrary/Sources/PetstoreClient/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/validation/PetstoreClient/Classes/OpenAPIs/Extensions.swift b/samples/client/petstore/swift5/validation/PetstoreClient/Classes/OpenAPIs/Extensions.swift
index 286c5001ff84..2082fb065ea4 100644
--- a/samples/client/petstore/swift5/validation/PetstoreClient/Classes/OpenAPIs/Extensions.swift
+++ b/samples/client/petstore/swift5/validation/PetstoreClient/Classes/OpenAPIs/Extensions.swift
@@ -157,6 +157,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift5/vaporLibrary/Sources/PetstoreClient/Extensions.swift b/samples/client/petstore/swift5/vaporLibrary/Sources/PetstoreClient/Extensions.swift
index d846f3e2b36c..5d754dea06cc 100644
--- a/samples/client/petstore/swift5/vaporLibrary/Sources/PetstoreClient/Extensions.swift
+++ b/samples/client/petstore/swift5/vaporLibrary/Sources/PetstoreClient/Extensions.swift
@@ -63,6 +63,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/alamofireLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/Infrastructure/Extensions.swift
index 2b6269d34a6b..6d16fb80f88e 100644
--- a/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/apiNonStaticMethod/Sources/PetstoreClient/Infrastructure/Extensions.swift
@@ -148,6 +148,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/asyncAwaitLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/combineDeferredLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/combineLibrary/Sources/CombineLibrary/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/default/Sources/PetstoreClient/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/default/Sources/PetstoreClient/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/default/Sources/PetstoreClient/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/default/Sources/PetstoreClient/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/objcCompatible/Sources/PetstoreClient/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/oneOf/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/oneOf/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/oneOf/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/oneOf/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
index 2b6269d34a6b..6d16fb80f88e 100644
--- a/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/promisekitLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
@@ -148,6 +148,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
index 83bf06577d98..b652c8fff994 100644
--- a/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/resultLibrary/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/urlsessionLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/validation/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/validation/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
index 68e48268d1b7..31258876af84 100644
--- a/samples/client/petstore/swift6/validation/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/validation/PetstoreClient/Classes/OpenAPIs/Infrastructure/Extensions.swift
@@ -147,6 +147,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }
diff --git a/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift b/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
index fe7303e5afc6..f5c0fa4a9b2e 100644
--- a/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
+++ b/samples/client/petstore/swift6/vaporLibrary/Sources/PetstoreClient/Infrastructure/Extensions.swift
@@ -60,6 +60,7 @@ extension KeyedEncodingContainerProtocol {
         let numberFormatter = NumberFormatter()
         numberFormatter.numberStyle = .decimal
         numberFormatter.locale = Locale(identifier: "en_US")
+        numberFormatter.usesGroupingSeparator = false
         let formattedString = numberFormatter.string(from: decimalNumber) ?? "\(value)"
         try encode(formattedString, forKey: key)
     }