Abstract: This system facilitates modification of application resources without modifying the source code of the application, while preventing modifications that may cause errors. After the source code and resources for an application are deployed, a user may provide a modified version of a resource, such as by changing a text string. The modified resource is compared to the existing version of the resource to determine if the modification will potentially cause an error when executing the application. If the modification adds or removes a parameter, changes a parameter name, changes a parameter type, or removes a resource, the change is prevented. Otherwise, the change is deployed without modifying the source code of the application. Parameters may be associated with hash codes or other types of identifiers to enable an application to locate a modified resource having a parameter that matches that of an original resource based on a matching identifier.