Return JSON

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This creates a repository in your GitHub account and deploys the application to Cloudflare Workers.

JavaScript

export default {
  async fetch(request) {
    const data = {
      hello: "world",
    };

    return Response.json(data);
  },
};

Run Worker in Playground

TypeScript

export default {
  async fetch(request): Promise<Response> {
    const data = {
      hello: "world",
    };

    return Response.json(data);
  },
} satisfies ExportedHandler;

Python

from workers import Response
import json

def on_fetch(request):
    data = json.dumps({"hello": "world"})
    headers = {"content-type": "application/json"}
    return Response(data, headers=headers)

Rust

use serde::{Deserialize, Serialize};
use worker::*;

#[derive(Deserialize, Serialize, Debug)]
struct Json {
    hello: String,
}

#[event(fetch)]
async fn fetch(_req: Request, _env: Env, _ctx: Context) -> Result<Response> {
    let data = Json {
        hello: String::from("world"),
    };
    Response::from_json(&data)
}

Hono

import { Hono } from 'hono';

const app = new Hono();

app.get('*', (c) => {
  const data = {
    hello: "world",
  };

  return c.json(data);
});

export default app;