Creating an envelope struct type inside our helpers file to update our writeJSON data type method's parameter. Updating healthcheckHandler and showMovieHandler with this new type to update our responses.

cmd/api/helpers.go

@@ -43,12 +43,14 @@ func (app *application) readIDParam(r *http.Request) (int64, error) {
 	return id, nil
 }
 
+type envelope map[string]any
+
 /*
 Define a writeJSON() helper for sending responses. This takes the destination
 http.ResponseWriter, the HTTP status code to send, the data to encode to JSON, and a
 header map containing any additional HTTP headers we want to include in the response.
 */
-func (app *application) writeJSON(w http.ResponseWriter, status int, data any, headers http.Header) error {
+func (app *application) writeJSON(w http.ResponseWriter, status int, data envelope, headers http.Header) error {
 	/*
 		Use the json.MarshalIndent() function so that whitespace is added to
 		the encoded JSON. Here we use no line prefix ("") and tab indents ("\t") for each element.