diff --git a/spec/features-json/api_controller_spec.rb b/spec/features-json/api_controller_spec.rb
index e5146391..f91de2b9 100644
--- a/spec/features-json/api_controller_spec.rb
+++ b/spec/features-json/api_controller_spec.rb
@@ -27,9 +27,12 @@ class MySecureApiController < FastlaneCI::APIController
     describe "unauthenticated request" do
       it "index is not successful" do
         get("/")
-        expect(last_response.status).to eq(401)
-        expect(json["message"]).to eq("A token must be passed")
-        expect(json["key"]).to eq("Authentication.Token.Missing")
+
+        expect_json_error(
+          message: "A token must be passed",
+          key: "Authentication.Token.Missing",
+          status: 401
+        )
       end
 
       it "public is successful" do
@@ -40,9 +43,11 @@ class MySecureApiController < FastlaneCI::APIController
 
       it "private is not successful" do
         get("/private")
-        expect(last_response.status).to eq(401)
-        expect(json["message"]).to eq("A token must be passed")
-        expect(json["key"]).to eq("Authentication.Token.Missing")
+        expect_json_error(
+          message: "A token must be passed",
+          key: "Authentication.Token.Missing",
+          status: 401
+        )
       end
     end
 
@@ -89,9 +94,11 @@ class MyMixedAuthApiController < FastlaneCI::APIController
 
       it "private is not successful" do
         get("/private")
-        expect(last_response.status).to eq(401)
-        expect(json["message"]).to eq("A token must be passed")
-        expect(json["key"]).to eq("Authentication.Token.Missing")
+        expect_json_error(
+          message: "A token must be passed",
+          key: "Authentication.Token.Missing",
+          status: 401
+        )
       end
     end
 
diff --git a/spec/features-json/artifact_json_controller_spec.rb b/spec/features-json/artifact_json_controller_spec.rb
index 9c799ba2..df46fcb7 100644
--- a/spec/features-json/artifact_json_controller_spec.rb
+++ b/spec/features-json/artifact_json_controller_spec.rb
@@ -54,9 +54,11 @@
       project_id = "project_id"
 
       get("/data/project/#{project_id}/build/#{build_number}/artifact/not_here")
-      expect(last_response.status).to eq(404)
-      expect(json["message"]).to eq("Couldn't find artifact")
-      expect(json["key"]).to eq("Artifact.Missing")
+      expect_json_error(
+        message: "Couldn't find artifact",
+        key: "Artifact.Missing",
+        status: 404
+      )
     end
   end
 end
diff --git a/spec/features-json/setting_json_controller_spec.rb b/spec/features-json/setting_json_controller_spec.rb
index 79d98358..ab3cc7d4 100644
--- a/spec/features-json/setting_json_controller_spec.rb
+++ b/spec/features-json/setting_json_controller_spec.rb
@@ -49,9 +49,11 @@
       non_existent_key = "non_existent_key"
       post("/data/settings/#{non_existent_key}")
 
-      expect(last_response.status).to eq(404)
-      expect(json["message"]).to eq("`non_existent_key` not found.")
-      expect(json["key"]).to eq("InvalidParameter.KeyNotFound")
+      expect_json_error(
+        message: "`non_existent_key` not found.",
+        key: "InvalidParameter.KeyNotFound",
+        status: 404
+      )
     end
   end
 
@@ -72,9 +74,11 @@
       non_existent_key = "non_existent_key"
       delete("/data/settings/#{non_existent_key}")
 
-      expect(last_response.status).to eq(404)
-      expect(json["message"]).to eq("`non_existent_key` not found.")
-      expect(json["key"]).to eq("InvalidParameter.KeyNotFound")
+      expect_json_error(
+        message: "`non_existent_key` not found.",
+        key: "InvalidParameter.KeyNotFound",
+        status: 404
+      )
     end
   end
 end
diff --git a/spec/features-json/user_json_spec.rb b/spec/features-json/user_json_spec.rb
index ba0c5a13..475bc83a 100644
--- a/spec/features-json/user_json_spec.rb
+++ b/spec/features-json/user_json_spec.rb
@@ -37,9 +37,12 @@ def app
       allow(FastlaneCI::Services.user_service.user_data_source).to receive(:user_exist?).with({ email: fake_email }).and_return(true)
 
       post "/api/user", { github_token: "github_token", password: "password" }.to_json, { "CONTENT_TYPE" => "application/json" }
-      expect(last_response.status).to eq(400)
-      expect(json["key"]).to eq("User.Error")
-      expect(json["message"]).to eq("Error creating new user")
+
+      expect_json_error(
+        message: "Error creating new user",
+        key: "User.Error",
+        status: 400
+      )
     end
   end
 end
diff --git a/spec/helper_functions.rb b/spec/helper_functions.rb
index 87bcb13f..872c1930 100644
--- a/spec/helper_functions.rb
+++ b/spec/helper_functions.rb
@@ -48,4 +48,11 @@ def notification_service
       )
     )
   end
+
+  def expect_json_error(message:, key:, status: nil)
+    expect(last_response.status).to eq(status) if status
+
+    expect(json["message"]).to eq(message)
+    expect(json["key"]).to eq(key)
+  end
 end