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Get a typed JSON from any API
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| import { go, no, type Result } from "./result.ts"; | |
| /** | |
| * Fetch JSON data and parse it safely. | |
| */ | |
| export const fetchJSON = async <T>( | |
| url: Parameters<typeof fetch>[0], | |
| { | |
| headers, | |
| parser, | |
| }: { | |
| headers?: HeadersInit; | |
| parser: (data: unknown) => T; | |
| }, | |
| ): Promise<Result<"InvalidData" | "NetworkError", T>> => { | |
| const response = await fetch(url, { headers }) | |
| .catch(() => no("NetworkError")); | |
| if (!response.ok) { | |
| return no("NetworkError"); | |
| } | |
| return response.json() | |
| .then((data) => parser(data)) | |
| .then((valid) => go(valid)) | |
| .catch(() => no("InvalidData")); | |
| }; |
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| import { number, object, parse } from "jsr:@valibot/valibot"; | |
| import { fetchJSON } from "./json.ts"; | |
| const schema = object({ | |
| base_experience: number(), | |
| }); | |
| if (import.meta.main) { | |
| // invoke like so: | |
| // deno run -A pokeapi.ts charmander | |
| const [pokemon] = Deno.args; | |
| const result = await fetchJSON( | |
| `https://pokeapi.co/api/v2/pokemon/${pokemon}`, | |
| { | |
| parser: (data) => parse(schema, data), | |
| }, | |
| ); | |
| if (!result.ok) { | |
| console.error(result.no); | |
| } else { | |
| console.log(result.go.base_experience); | |
| } | |
| } |
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| export type Result<No, Go> = { ok: false; no: No } | { ok: true; go: Go }; | |
| export function no<const T>(no: T): { ok: false; no: T } { | |
| return { ok: false, no }; | |
| } | |
| export function go<const T>(go: T): { ok: true; go: T } { | |
| return { ok: true, go }; | |
| } |
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