index.js

router.post("/v1/users", async (context) => {
  if (!context.request.hasBody) {
    context.response.status = 400;
    context.response.body = { error: "Request body cannot be empty" };
  } else {
    const { firstName, lastName, age } = (await context.request.body(true)).value
    const ageInt = parseInt(age);
    if (firstName && lastName && ageInt) {
      dummyUsers.push({ id: dummyUsers.length + 1, firstName: firstName, lastName: lastName, age: ageInt });
      context.response.status = 201;
      context.response.body = dummyUsers[dummyUsers.length - 1];
    } else {
      context.response.status = 400;
      context.response.body = { error: "Invalid payload's provided" };
    }
  }
})