Preview Cron

Trigger & test your Vercel cron jobs. Vercel only runs them in production — this project lets you test them anywhere, two ways:

Local development → npx previewcron

Run it in your project — no install, no setup:

npx previewcron

It reads your vercel.json, detects CRON_SECRET and VERCEL_AUTOMATION_BYPASS_SECRET, and opens a dashboard to trigger each cron against your dev server. Works with any framework. See the CLI documentation.

Preview deployments → previewcron.dev

1. Paste your vercel.json
2. Enter your preview URL (e.g. https://my-app-abc123.vercel.app)
3. Add your Vercel bypass token if the preview has Deployment Protection
4. Click "Run" on any cron job

Nothing is stored: your configuration and tokens stay in your browser's memory and disappear when you close the tab.

Why two ways?

The web app cannot reach localhost (browser security); the CLI runs on your machine, so it can. Same dashboard, same experience.

Development

bun install
bun run dev

Open http://localhost:3000

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License: MIT