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ngrok creates a secure public URL that forwards traffic to a port running inside your Agent 37 terminal. That means your app can stay bound to localhost in the instance while still being reachable from the internet. For example, if your app runs inside the Agent 37 terminal on: 
http://localhost:3000
ngrok can create a public URL that forwards requests to that app.

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Step 1: Open the Agent 37 terminal

  1. Sign in to the Agent 37 dashboard
  2. Open the instance where your app is running
  3. Click Terminal
ngrok is already available in the Agent 37 terminal, so you can start from authentication and tunnel setup.

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Step 2: Add your authentication token

Before you continue, confirm ngrok is available: 
ngrok version
Then sign in to the ngrok dashboard and copy your authtoken.
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Then run: 
ngrok config add-authtoken YOUR_AUTHTOKEN
This connects the ngrok client inside your Agent 37 instance to your ngrok account.

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Step 3: Start an ngrok tunnel from the Agent 37 terminal

If your app runs on port 3000, run: 
ngrok http 3000
If your app uses another port, replace 3000 with that port number. ngrok will start a tunnel and show output similar to: 
Forwarding  https://abc123.ngrok-free.app -> http://localhost:3000

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Step 4: Open the public URL

Copy the https://...ngrok... forwarding URL and open it in your browser. You should see the app running inside your Agent 37 instance through the ngrok URL.