How can I add cron job to `wrangler.json` file?

I used svelitekit framework template and hosted to workers. I see this in my wrangler.json file:

"main": ".svelte-kit/cloudflare/_worker.js"

"main": ".svelte-kit/cloudflare/_worker.js"

How can I add cron job to that file? How can I extand that file to cron job?

17 Replies

Walshy•3w ago

https://developers.cloudflare.com/workers/examples/cron-trigger/

Cloudflare Docs

Setting Cron Triggers · Cloudflare Workers docs

Set a Cron Trigger for your Worker.

Walshy•3w ago

https://i.walshy.dev/vZ6vbY0TKxMluJ4bMv.png

Sithu KhantOP•3w ago

where can I place this code?

interface Env {}
export default {
  async scheduled(
    controller: ScheduledController,
    env: Env,
    ctx: ExecutionContext,
  ) {
    console.log("cron processed");
  },
};

interface Env {}
export default {
  async scheduled(
    controller: ScheduledController,
    env: Env,
    ctx: ExecutionContext,
  ) {
    console.log("cron processed");
  },
};

Walshy•3w ago

Probably a question for SvelteKit people, I don't know if they allow setting things like cron triggers and from the original post, it seems they control the whole worker

Hello, I’m Allie!•3w ago

I shim it in manually, but note that this only works with deployed Workers/wrangler dev It won’t run when using Svelte’s own Dev Process

Hello, I’m Allie!•3w ago

https://github.com/helloimalastair/authrora/blob/main/src/worker.ts

GitHub

authrora/src/worker.ts at main · helloimalastair/authrora

Authentication and Authorization at the Edge. Contribute to helloimalastair/authrora development by creating an account on GitHub.

Sithu KhantOP•3w ago

How about like this? I got this from gpt:

import worker from "./../../../../.svelte-kit/cloudflare/_worker.js";

// Merge SvelteKit's worker with our cron handler
export default {
  ...worker,
  async scheduled(event: ScheduledEvent, env: Env, ctx: ExecutionContext) {
    ctx.waitUntil(handleCronJob(event));
  }
};

async function handleCronJob(event: ScheduledEvent) {
  console.log(`Cron ${event.cron} triggered at ${new Date().toISOString()}`);
  // Add your cron logic here
}

import worker from "./../../../../.svelte-kit/cloudflare/_worker.js";

// Merge SvelteKit's worker with our cron handler
export default {
  ...worker,
  async scheduled(event: ScheduledEvent, env: Env, ctx: ExecutionContext) {
    ctx.waitUntil(handleCronJob(event));
  }
};

async function handleCronJob(event: ScheduledEvent) {
  console.log(`Cron ${event.cron} triggered at ${new Date().toISOString()}`);
  // Add your cron logic here
}

Hello, I’m Allie!•3w ago

That looks like it might work? Then you just need to point your main towards that, instead of the sveltekit output

Sithu KhantOP•3w ago

Is this working?

Hello, I’m Allie!•3w ago

Yes, I have this deployed right now

Sithu KhantOP•3w ago

Then I might use that method @HardlyWorkin', hey just a suggestion, this method works too:

import worker from "./../../../../.svelte-kit/cloudflare/_worker.js";

interface Env {
  DB: D1Database;
}

export default {
  ...worker,
  async scheduled(event: ScheduledEvent, env: Env, ctx: ExecutionContext) {
    ctx.waitUntil(handleCronJob(event)); // Pass env if needed
  }
};

async function handleCronJob(event: ScheduledEvent) {
  const cron = event.cron;
  const time = new Date(event.scheduledTime).toISOString();

  console.log(`Cron ${cron} triggered at ${time}`);

  switch (cron) {
    case "* * * * *":
      await minuteJob();
      break;
    case "0 * * * *":
      await hourlyJob();
      break;
    case "0 0 * * *":
      await dailyJob();
      break;
    default:
      console.warn("Unknown cron pattern:", cron);
  }
}

// Example jobs
async function minuteJob() {
  // Every minute logic
  console.log("Minute job...");
}

async function hourlyJob() {
  // Hourly logic (at :00)
}

async function dailyJob() {
  // Daily midnight logic
}

import worker from "./../../../../.svelte-kit/cloudflare/_worker.js";

interface Env {
  DB: D1Database;
}

export default {
  ...worker,
  async scheduled(event: ScheduledEvent, env: Env, ctx: ExecutionContext) {
    ctx.waitUntil(handleCronJob(event)); // Pass env if needed
  }
};

async function handleCronJob(event: ScheduledEvent) {
  const cron = event.cron;
  const time = new Date(event.scheduledTime).toISOString();

  console.log(`Cron ${cron} triggered at ${time}`);

  switch (cron) {
    case "* * * * *":
      await minuteJob();
      break;
    case "0 * * * *":
      await hourlyJob();
      break;
    case "0 0 * * *":
      await dailyJob();
      break;
    default:
      console.warn("Unknown cron pattern:", cron);
  }
}

// Example jobs
async function minuteJob() {
  // Every minute logic
  console.log("Minute job...");
}

async function hourlyJob() {
  // Hourly logic (at :00)
}

async function dailyJob() {
  // Daily midnight logic
}

Sithu KhantOP•3w ago

after multiple trial failed, it is working now 🎉

Sithu KhantOP•3w ago

@Hello, I’m Allie! you are the svelte guy, right? Do you know how to setup trpc?

Hello, I’m Allie!•3w ago

I mean, I do use Svelte in my own projects, but I wouldn’t say I’m an expert at it. As for tRPC, I’m afraid I haven’t used it before, so I wouldn’t know any more about setting it up than you

Sithu KhantOP•3w ago

it is oaky, I mean I looked up the project you provided, you seems have experiences in Svelte a lot

Hello, I’m Allie!•3w ago

Not really, other than a few sandbox projects with 1-2 files, this was actually my first larger project with Svelte(Kit). But thank you for the vote of confidence! Actually, nvm, WDOL is also written in SvelteKit… point still stands though, I’m definitely no expert!

Sithu KhantOP•3w ago

hey I found this one: https://github.com/ottomated/create-o7-app

GitHub

GitHub - ottomated/create-o7-app: An opinionated CLI for creating t...

An opinionated CLI for creating type-safe Svelte apps. - ottomated/create-o7-app

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How can I add cron job to `wrangler.json` file?

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