diff --git a/README.md b/README.md
index 173a178..b376e80 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # OpenWiFi Provisioning
 
+## Build from source.
+You need: https://github.com/pboettch/json-schema-validator.git
+You need: https://github.com/nlohmann/json.git
+build and install them.
+
 ## Root entity
 It's UUID value is 0000-0000-0000. Its parent entity must be empty.
 
diff --git a/build b/build
index 34bba94..147ea53 100644
--- a/build
+++ b/build
@@ -1 +1 @@
-156
\ No newline at end of file
+158
\ No newline at end of file
diff --git a/openapi/ow_prov.yaml b/openapi/ow_prov.yaml
index ad65399..1181b19 100644
--- a/openapi/ow_prov.yaml
+++ b/openapi/ow_prov.yaml
@@ -1934,6 +1934,11 @@ paths:
             format: uuid
             example: When creating the root entity, the uuid 0000-0000-0000 must be entered. When creating a non-root entity, uuid must be 1
           required: true
+        - in: query
+          name: validateOnly
+          schema:
+            type: boolean
+          required: false
       requestBody:
         description: Information used to create the new entity
         content:
diff --git a/src/ConfigurationValidator.h b/src/ConfigurationValidator.h
index b3ce1da..2fed429 100644
--- a/src/ConfigurationValidator.h
+++ b/src/ConfigurationValidator.h
@@ -56,7 +56,7 @@ namespace OpenWifi {
         std::unique_ptr<json_validator>  Validator_;
     };
 
-    bool ValidateUCentralConfiguration(const std::string &C) { return ConfigurationValidator::instance()->Validate(C); }
+    inline bool ValidateUCentralConfiguration(const std::string &C) { return ConfigurationValidator::instance()->Validate(C); }
 }
 
 #endif //OWPROV_CONFIGURATIONVALIDATOR_H
diff --git a/src/RESTAPI_configurations_handler.cpp b/src/RESTAPI_configurations_handler.cpp
index f5580fc..5666919 100644
--- a/src/RESTAPI_configurations_handler.cpp
+++ b/src/RESTAPI_configurations_handler.cpp
@@ -12,6 +12,8 @@
 #include "Daemon.h"
 #include "RESTAPI_errors.h"
 
+#include "ConfigurationValidator.h"
+
 namespace OpenWifi{
 
     void RESTAPI_configurations_handler::DoGet() {
@@ -103,6 +105,21 @@ namespace OpenWifi{
             return;
         }
 
+        std::string Arg;
+        if(HasParameter("validateOnly",Arg) && Arg=="true") {
+            auto Body = ParseStream();
+            if(!Body->has("configuration")) {
+                BadRequest("Must have 'configuration' element.");
+                return;
+            }
+            auto Config=Body->get("configuration").toString();
+            Poco::JSON::Object  Answer;
+            auto Res = ValidateUCentralConfiguration(Config);
+            Answer.set("valid",Res);
+            ReturnObject(Answer);
+            return;
+        }
+
         ProvObjects::DeviceConfiguration C;
         Poco::JSON::Object::Ptr Obj = ParseStream();
         if (!C.from_json(Obj)) {