---
title: "cronTrigger()"
description: "`cronTrigger()` is set as a [Job's trigger](/docs/sdk/job) to trigger a Job on a recurring schedule using a CRON expression."
---

## Development

<Snippet file="scheduled-dev-warning.mdx" />

## CRON expressions

CRON expressions are strings that define when something should happen.

Some examples:

- `"0 0 * * *"`: will run the Job every day at 12:00am UTC.
- `"30 14 * * 1"`: will run the Job every Monday at 2:30pm UTC.

A useful tool when writing CRON expressions is [crontab guru](https://crontab.guru).

## Parameters

<ResponseField name="options" type="object" required>
  <Expandable title="options" defaultOpen>
    <ResponseField name="cron" type="string" required>
      A CRON expression that defines the schedule. Note that the timezone used is always UTC.
    </ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>

```typescript 9am UTC everyday
client.defineJob({
  id: "scheduled-job-1",
  name: "Scheduled Job 1",
  version: "0.1.1",
  // 9am every day
  trigger: cronTrigger({
    cron: "0 9 * * *",
  }),
  run: async (payload, io, ctx) => {
    await io.logger.info("Received the scheduled event", {
      payload,
    });

    return { foo: "bar" };
  },
});
```

```typescript First day of month
client.defineJob({
  id: "scheduled-job-2",
  name: "Scheduled Job 2",
  version: "0.1.1",
  // The first day of the month at 2am UTC
  trigger: cronTrigger({
    cron: "0 2 1 * *",
  }),
  run: async (payload, io, ctx) => {
    await io.logger.info("Received the scheduled event", {
      payload,
    });

    return { foo: "bar" };
  },
});
```

</RequestExample>