Get a typed JSON from any API

json.ts

export const fetchJSON = async <T>(
  url: Parameters<typeof fetch>[0],
  {
    headers,
    parser,
  }: {
    headers?: Record<string, string>;
    parser: (data: unknown) => T | Promise<T>;
  }
): Promise<T> => {
  const data: unknown = await fetch(url, { headers }).then((r) => r.json());
  return parser(data);
};

pokeapi.ts

import { object, number } from "https://deno.land/x/zod@v3.17.3/mod.ts";
import { fetchJSON } from "./json.ts";

const sourcesSchema = object({
  base_experience: number(),
});
const { base_experience } = await fetchJSON(
  "https://pokeapi.co/api/v2/pokemon/ditto",
  {
    parser: sourcesSchema.parseAsync,
  }
);

console.log(base_experience);