Webhook Viewer – Inspect and Debug Webhooks in Real Time

Receive and View Webhook Payloads Instantly

Modern APIs often use webhooks to send real-time notifications between services. Instead of constantly polling an API for updates, webhooks allow applications to automatically deliver event data when something happens.

For example, payment gateways, Git repositories, and messaging platforms often send webhook events when transactions occur, repositories are updated, or messages are received.

However, debugging webhooks during development can be difficult. Developers need a publicly accessible endpoint to receive webhook events and inspect the data being sent.

The Webhook Viewer on CoolDev.Tools solves this problem by generating a unique webhook URL that can receive events and display the payload in real time. This allows developers to quickly inspect webhook requests, analyze headers and body data, and debug integrations.

With support for local forwarding, developers can also route webhook events directly to their local development environment for seamless testing.

Because the tool is browser-based, you can start testing webhook integrations instantly without deploying your own webhook server.

What is a Webhook?

A webhook is an HTTP callback that allows one application to send real-time data to another application when a specific event occurs.

Instead of asking a server repeatedly for updates, the server pushes the data to a predefined endpoint URL.

Example workflow:

A service triggers an event (for example, a successful payment).
The service sends an HTTP POST request to a configured webhook URL.
The receiving application processes the event data.

Webhooks are widely used in API integrations because they enable efficient event-driven communication between systems.

How Webhooks Work

Webhooks operate using standard HTTP requests.

When an event occurs, the sending service makes an HTTP request to the webhook endpoint.

Example webhook request:

POST /webhook-endpoint
Content-Type: application/json

{
    "event": "payment_success",
    "amount": 1500,
    "currency": "INR"
}

The receiving server processes this data and triggers appropriate logic, such as updating a database or notifying a user.

Why Developers Need a Webhook Viewer

Testing webhook integrations often requires a publicly accessible endpoint. During development, this can be inconvenient because local servers are usually not exposed to the internet.

A webhook viewer provides a temporary endpoint that captures webhook requests and displays them for inspection.

Debug Incoming Payloads

Developers can inspect the exact JSON payload sent by the service.

This helps verify whether the event data matches the API documentation.

Inspect HTTP Headers

Webhook requests often include important headers such as:

authentication signatures
timestamps
event identifiers

Viewing these headers helps developers validate webhook security mechanisms.

Test API Integrations

When integrating services such as payment gateways or CI/CD tools, developers need to confirm that webhook events are received correctly.

Accelerate Development

A webhook viewer removes the need to deploy temporary servers or write custom debugging tools.

What is Local Forwarding?

Local forwarding allows webhook events received by the viewer to be forwarded to a local development server.

This enables developers to test webhook handlers running on their local machine.

Example workflow:

A webhook event is sent to the public webhook URL.
The viewer receives and logs the request.
The request is forwarded to a local endpoint such as:

http://localhost:3000/webhook

This makes it possible to test integrations without deploying code to a remote server.

Features of the Webhook Viewer Tool

The Webhook Viewer on CoolDev.Tools includes several features that make webhook testing easier.

Unique Webhook URL

The tool generates a unique endpoint URL that can receive webhook events from external services.

Real-Time Event Monitoring

Webhook requests appear instantly in the interface, allowing developers to inspect incoming data in real time.

Payload Inspection

Developers can view detailed information about each webhook request, including:

request headers
request body
event data

Local Forwarding Support

Webhook events can be forwarded to a local development server for testing.

Browser-Based Interface

The tool runs entirely in the browser, allowing developers to start testing webhooks immediately.

No Server Setup Required

Developers do not need to deploy their own webhook receivers or debugging services.

How to Use the Webhook Viewer

Using the Webhook Viewer tool is simple.

Step 1: Generate a Webhook URL

The tool provides a unique URL that acts as a webhook endpoint.

Example:

https://cooldev.tools/webhook/abc123

Step 2: Configure the Webhook

Paste the generated URL into the webhook configuration section of the service you are integrating.

Examples include:

payment gateways
Git platforms
notification systems

Step 3: Trigger an Event

Perform an action that triggers the webhook event.

For example:

create a new Git commit
process a payment
update a database record

Step 4: View Incoming Requests

The webhook viewer displays incoming events in real time.

You can inspect the payload and headers to verify the integration.

Step 5: Forward Events Locally (Optional)

If local forwarding is enabled, webhook events will be forwarded to your local development server.

Real Developer Use Cases

Payment Gateway Integrations

Payment platforms such as Stripe or Cashfree send webhook events for transactions, refunds, and subscription updates.

Developers use webhook viewers to inspect these events during integration.

Git Repository Events

Git platforms send webhook events for actions such as:

push events
pull requests
release publishing

CI/CD Automation

Continuous integration systems trigger webhooks to start builds or deployments.

Notification Systems

Messaging platforms may send webhook events when messages or alerts occur.

API Development

Developers building APIs often implement webhook-based event systems for third-party integrations.

Advantages of Browser-Based Webhook Tools

Browser-based webhook debugging tools provide several benefits.

Instant Setup

You can generate a webhook endpoint immediately without deploying infrastructure.

Faster Debugging

Incoming webhook requests can be inspected in real time.

No Server Configuration

Developers do not need to configure web servers or public tunnels.

Ideal for Local Development

Local forwarding allows developers to test webhook handlers on their own machine.

Frequently Asked Questions (FAQs)

What is a webhook endpoint?

A webhook endpoint is a URL that receives HTTP requests when an event occurs in another system.

Are webhooks secure?

Most webhook systems include authentication mechanisms such as signed headers or tokens to verify request authenticity.

Can webhooks send JSON data?

Yes. Most webhook payloads are sent in JSON format.

Why use local forwarding?

Local forwarding allows developers to test webhook integrations with applications running on their local machine.

Do webhooks work in real time?

Yes. Webhooks send event data immediately after the event occurs.

Conclusion

Webhooks play a crucial role in modern API integrations by enabling real-time communication between services. However, debugging webhook payloads during development can be challenging without proper tools.

The Webhook Viewer on CoolDev.Tools provides a simple and powerful way to receive, inspect, and debug webhook events. With unique webhook URLs, real-time event monitoring, and local forwarding capabilities, the tool makes webhook integration testing faster and more efficient.

Whether you are integrating payment systems, automation workflows, or external APIs, this tool helps developers inspect webhook payloads and ensure integrations work reliably.