How can I simulate a webhook callback using Postman?

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Question:

I’m testing a third-party service that sends a webhook to my API. I want to simulate this callback using Postman.

What I’ve Tried:

  • Used Postman’s Mock Server to generate a public URL
  • Tried sending a POST request to my local server using ngrok
  • Checked the Postman console for request/response logs

The Issue:

I can’t seem to get the third-party service to hit my callback URL. It times out or shows 404.

Context:

  • Postman version: 10.22.4
  • Platform: macOS
  • My backend is running on localhost:5000 (Node.js + Express)

What I’m Hoping to Learn:

Is there a recommended way to simulate or expose a local endpoint for receiving webhooks via Postman or other tools?

Thanks in advance!