Updated the config.cpp

src/api/config.cpp

@@ -9,6 +9,26 @@ bool config::is_valid_config(const json& config) {
         return false;
     }
 
+    if (!config.contains("database")) {
+        std::cout << "Config file is missing \"database\" field." << std::endl;
+        return false;
+    }
+
+    if (!config["database"].contains("string")) {
+        std::cout << "Config file is missing \"database.string\" field." << std::endl;
+        return false;
+    }
+
+    if (!config["database"].contains("username")) {
+        std::cout << "Config file is missing \"database.user\" field." << std::endl;
+        return false;
+    }
+
+    if (!config["database"].contains("password")) {
+        std::cout << "Config file is missing \"database.password\" field." << std::endl;
+        return false;
+    }
+
     return true;
 }