What is a webhook request inspector online?
A webhook request inspector online is a tool that gives you a temporary endpoint or public URL where third-party services can send webhook requests. It captures the incoming HTTP request and lets you inspect the HTTP headers, query parameters, request body, and delivery metadata in a browser. That makes it easier to debug integrations without exposing a local server or changing production systems.
These tools are commonly used for webhooks, integration testing, API testing, and general developer tools workflows. They are especially helpful when you need to see exactly what a service sent, whether the payload was JSON, XML, form-data, or x-www-form-urlencoded.
How does a webhook request inspector work?
A webhook inspector works by generating a unique endpoint for your test. You copy that URL into a service such as Stripe, PayPal, Shopify, GitHub, GitLab, Slack, Discord, Zapier, or Make, then trigger a test event. When the service sends a POST request or, in some cases, a GET request, the inspector records the request and displays it in a readable interface.
Most inspectors show the request method, headers, query string, body, timestamp, and source information. Good tools also provide payload inspection, request history, and the ability to view raw and formatted content side by side. For a deeper overview, see webhook inspection and webhook request inspector.
How do I create a webhook URL for testing?
To create a webhook URL for testing, open the inspector, generate a new endpoint, and copy the public URL into the webhook settings of the app you want to test. Many tools give you a temporary endpoint that is ideal for short debugging sessions, while others let you keep a persistent endpoint for repeated tests.
If you are testing multiple integrations, create one URL per service so requests do not overlap. That is especially useful when comparing events from Stripe, Shopify, or GitHub. If you need a broader setup guide, see webhook endpoint testing online and webhook development tool.
Can I inspect headers, payloads, and query parameters?
Yes. A good inspector should let you review HTTP headers, query parameters, the request body, and the full payload in both raw and formatted views. This is important when you need to confirm content type, authentication headers, or a signature header used for verification.
For example, a Stripe webhook may arrive as JSON with a signature header, while a form submission may use x-www-form-urlencoded or form-data. Being able to compare the raw request with the parsed view helps you catch encoding issues, missing fields, and unexpected transformations.
How do I debug a failed webhook delivery?
Start by checking whether the request reached the inspector at all. If it did, compare the captured request with what your application expects. Common problems include an empty body, malformed JSON, the wrong content type, missing headers, or a mismatch between the sender’s payload and your parser.
If the delivery failed after the request was sent, review the response status and timing. Some providers retry failed deliveries, so request history can help you compare attempts and spot duplicates. A webhook debugger and webhook payload viewer for debugging are useful when you need to inspect the exact body and headers that caused the failure.
How do I verify webhook signatures?
Many providers use webhook signatures based on HMAC. The sender signs the payload with a shared secret, and your server recomputes the signature from the exact raw request body. If the body changes, the secret is wrong, or middleware rewrites the payload before verification, signature validation can fail.
To debug this, compare the raw body in the inspector with the body your application receives. Make sure you are validating the original bytes, not a reserialized JSON object. This matters for providers such as Stripe, GitHub, and Shopify, where signature verification is part of the security model.
Can I replay or forward webhook requests?
Yes. Many inspectors support request replay so you can resend the same captured webhook after fixing a bug. That is useful when you want to retest signature handling, parsing, or downstream processing without waiting for a new live event.
Some tools also support request forwarding, which sends the captured request to another endpoint such as a staging app or local service. This is helpful for integration testing, migration work, and debugging across environments. If you need a capture-and-forward workflow, compare options like webhook request inspector and webhook testing tool for developers.
What features should I look for in a webhook testing tool?
Look for these features:
- Request history and search
- Raw and formatted payload inspection
- Support for JSON, XML, form-data, and x-www-form-urlencoded
- Header and query parameter inspection
- Request replay and request forwarding
- Team sharing and collaboration
- Retention controls and export options
- Access controls and deletion tools
- Support for custom responses
- HTTPS endpoints
These features matter because webhook debugging is rarely a one-step task. You may need to compare retries, hand off a case to another developer, or preserve a request long enough to reproduce a bug. A strong webhook testing tool for developers should support those workflows, not just basic capture.
Is it safe to use an online webhook inspector?
It can be safe if you use it carefully. Choose a tool that uses HTTPS, has clear data retention policies, and lets you delete captured requests when you are done. Avoid sending sensitive PII unless it is necessary for debugging, and be cautious with payment or customer data.
An online inspector is still a public-facing endpoint, so treat it like any other temporary development surface. If your team needs stricter controls, look for masking, private workspaces, and access restrictions. For a documentation-level overview, see request inspector.
What is the difference between a webhook inspector and ngrok?
A webhook inspector is designed to capture, display, replay, and sometimes forward inbound webhook traffic. ngrok is primarily a secure tunnel that exposes a local service to the internet.
Use ngrok when you need external services to reach an app running on your machine. Use a webhook inspector when you want visibility into the incoming request itself, including headers, payloads, and request history. Some teams use both: ngrok for local development and an inspector for payload inspection and debugging.
Can I use a webhook inspector for API testing?
Yes, but mainly for inbound request inspection and integration testing rather than full API lifecycle testing. A webhook inspector can help you verify that an API or third-party service is sending the expected request, and it can also help you test custom responses or replay captured traffic.
This is useful when you are validating callbacks, event notifications, or request formatting before connecting the service to production. For broader API testing, you may still need dedicated API tools, but an inspector is a practical companion for debugging request/response behavior.
How long are webhook requests stored?
Storage time depends on the tool. Some services keep requests only briefly, while others retain them for days or longer. Check the provider’s data retention policy before using it for sensitive integrations.
If request history matters to your workflow, choose a tool that clearly states how long it stores captured requests and whether you can export or delete them manually. That is especially important for teams that need to review older deliveries during incident response or integration testing.
What are the best use cases for webhook inspection tools?
Webhook inspection tools are most useful for:
- Debugging payment webhooks from Stripe and PayPal
- Testing app callbacks from Shopify, GitHub, GitLab, Slack, and Discord
- Validating automation flows in Zapier and Make
- Comparing retries and duplicate deliveries
- Verifying webhook signatures and HMAC logic
- Inspecting malformed payloads or empty bodies
- Supporting integration testing and API testing
- Sharing request history with teammates during debugging
They are especially valuable when you need to see the exact payload that arrived, not just whether a request failed.
What should I do if the webhook body is empty?
First, confirm that the sender actually included a body. Some events are intentionally minimal, while others may be empty because of a configuration issue, a parsing problem, or a mismatch in content type.
Check the request headers, especially Content-Type, and verify that your application is reading the raw body before any middleware modifies it. If the provider signs the payload, compare the raw request body in the inspector with what your app receives. An empty body can also happen if the sender is using a different format than expected, such as JSON versus x-www-form-urlencoded.
Can teams collaborate using a webhook request inspector?
Yes. Teams can collaborate by sharing the same endpoint, reviewing request history, and handing off debugging work without recreating the issue. This is useful for developers, QA, support, and integration engineers who need the same source of truth.
Collaboration features may include shared workspaces, comments, access controls, and request forwarding to another environment. If your team needs a shared debugging workflow, compare tools such as webhook inspection, webhook payload viewer for debugging, and webhook development tool.
Common tools and alternatives
Popular tools in this category include RequestBin, Webhook.site, and Pipedream. These services can help with request capture, payload inspection, request history, and forwarding. The right choice depends on whether you need a simple temporary endpoint, a collaboration-friendly workspace, or a more complete developer workflow.
If you are comparing options, start with webhook request inspector, webhook inspection, webhook endpoint testing online, webhook payload viewer for debugging, webhook debugger, webhook testing tool for developers, request inspector, and webhook development tool.