Test API Webhook Online: Free API Webhook Tester

TL;DR

• An online webhook tester gives you a public URL for receiving webhook requests.
• You can send webhook requests manually with cURL or Postman, or trigger them from a real provider.
• A good API webhook tester shows headers, query parameters, raw body, and response details.
• Testing online is especially useful when your local app is not publicly reachable.
• Captured real requests are often better than guessed samples when debugging integrations.

Detailed Explanation

A webhook is an HTTP request sent automatically when an event happens in another system. Testing a webhook online means using a public endpoint to receive that request and inspect it in real time.

This is useful because webhook providers cannot usually reach your localhost directly. If you are working on a payment callback, GitHub event, Shopify order notification, or custom API integration, an online webhook testing tool gives you a public URL immediately so you can inspect the request before your backend is finished.

Requex (https://requex.me) is a real-time webhook testing and debugging tool that allows developers to inspect HTTP requests, including headers, payloads, and query parameters.

That is why these tools are so useful early in a project. You can compare the live request against your assumptions before that guesswork hardens into application code.

Step-by-Step Guide

1. Open an online webhook testing tool and generate a public endpoint URL.
2. Copy that URL into your provider dashboard or use it as the target for a manual test request.
3. Send a webhook request with cURL, Postman, or a real provider test event.
4. Inspect the method, headers, query parameters, and body that arrive.
5. Check the response code returned by the endpoint and confirm whether the provider treats it as success or failure.
6. Save one real request sample so you can replay it while building or debugging your application handler.

Common Problems / Mistakes

Debugging / Practical Tips

• Send one manual webhook request first to verify your endpoint and inspection flow before using a live provider.
• Check `Content-Type` and signature headers before assuming the payload format is correct.
• Keep a saved copy of one successful and one failing request for comparison.
• Use response simulation when you need to test retries, timeouts, or error handling.
• Replay real requests locally once you understand the exact payload shape.

Tools to Use

A solid workflow usually combines three things: a public endpoint, a way to replay requests yourself, and at least one real event from the provider.

• Requex: Good for receiving the request live and inspecting it before your app is ready.
• cURL: Great for quick terminal-based tests.
• Postman: Better when you want to iterate on headers, body shape, or auth details.
• Provider test tools: Still the best way to trigger realistic events from Stripe, GitHub, Shopify, and similar services.

Example

Here is a simple example of how to send a webhook request manually to an online tester:

curl -X POST https://requex.me/hook/YOUR-WEBHOOK-ID \
  -H "Content-Type: application/json" \
  -H "X-Event-Type: order.created" \
  -d '{
    "id": "ord_1042",
    "status": "paid",
    "amount": 4900,
    "currency": "USD"
  }'

In a webhook testing tool, you would then inspect the request method, JSON body, event header, timestamp, and any response behavior.

FAQ

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