// use case

Expose your Next.js dev server to Slack for Slack events

1. 1

   Reserve a stable subdomain

   On the lrok free plan you keep one reserved subdomain forever. Pick a name your Slack dashboard can hold onto — webhook URLs that survive laptop restarts mean fewer dashboard re-pastes.

   $ lrok reserve nex-slack
     Reserved https://nex-slack.lrok.io

2. 2

   Run your Next.js app

   Start the dev server on port 3000 (the Next.js default).

   $ npm run dev

3. 3

   Tunnel localhost to the public URL

   lrok forwards https://nex-slack.lrok.io/api/webhooks/handler → http://127.0.0.1:3000/api/webhooks/handler. The flag --hint binds your reserved subdomain to this tunnel.

   $ lrok http 3000 --hint nex-slack
     Forwarding https://nex-slack.lrok.io  ->  http://127.0.0.1:3000

4. 4

   Paste the URL into Slack

   Slack app → Event Subscriptions → Request URL. Paste https://nex-slack.lrok.io/api/webhooks/handler as the destination.

5. 5

   Watch deliveries land in the request inspector

   Every webhook Slack sends shows up at lrok.io/dashboard with full body, headers, status, and latency. Re-deliver any request to your Next.js handler with one click. On the first paste of your URL into Slack, the app sends a {"type":"url_verification","challenge":"..."} POST. Echo back the challenge as JSON and you're live.