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/healthcheck.go

@@ -13,13 +13,13 @@ initialize it in main()
 */
 func (app *application) healthcheckHandler(w http.ResponseWriter, r *http.Request) {
 	// Create a map which holds the information that we want to send in the response.
-	data := map[string]string{
+	env := envelope{
 		"status":      "available",
 		"environment": app.config.env,
 		"version":     version,
 	}
 
-	err := app.writeJSON(w, http.StatusOK, data, nil)
+	err := app.writeJSON(w, http.StatusOK, env, nil)
 	if err != nil {
 		app.logger.Error(err.Error())
 		http.Error(w, "The server encountered a problem and could not process your request", http.StatusInternalServerError)