I'm unable to make a GET request in postman. But able to make post requests

const appRouter = router({
  user: userRouter,
  testRoute: publicProcedure
    .input(
      z.object({
        name: z.string().nullish(),
      }),
    )
    .output(
      z.object({
        greeting: z.string(),
      }),
    )
    .query(({ input }) => {
      return {
        greeting: `hello ${input.name}`,
      };
    }),
});

export type AppRouter = typeof appRouter;
export { appRouter };

    app.use(
      "/api",
      createExpressMiddleware({
        router: appRouter,
        createContext,
      }),
    );