Debugging & Testing Tools

Inspect HTTP requests, debug APIs, and test endpoints

Send GET, POST, PUT, PATCH and DELETE requests to any HTTP endpoint and inspect the response in a clean, developer‑friendly interface. Set custom headers, attach JSON or form bodies, and watch status codes, response times, and payloads come back in real time — all without leaving your browser.

API debugging is at the heart of modern web development. Whether you're integrating with a third‑party REST service, building your own backend, or troubleshooting an authentication issue in production, having a fast, lightweight test client at your fingertips removes hours of frustration from the day.

This tool is intentionally privacy‑first: requests are sent directly from your browser using fetch, with no proxy server in between. That means tokens, cookies and headers are never logged or stored on our infrastructure, and CORS rules behave exactly as they would in your real application.

Why use Debug Testing Tool?

All HTTP methods

GET, POST, PUT, PATCH, DELETE, HEAD and OPTIONS — all supported with custom bodies and headers.

Inspect everything

See status codes, response time, headers, and pretty‑printed JSON or text bodies.

No proxy, no tokens stored

Requests originate from your browser; we never see your credentials.

Reusable request templates

Save common requests for quick reuse across debugging sessions.

How to use Debug Testing Tool

1
Enter the URL
Paste the endpoint you want to call.
2
Select the HTTP method
Pick GET, POST, PUT, PATCH, DELETE or others depending on the operation.
3
Add headers and body
Set Authorization, Content‑Type, and any payload your endpoint expects.
4
Send and inspect the response
Review status code, headers, body and timing right inside the browser.

Common use cases

Test REST APIs

Hit endpoints from any backend or third‑party service to verify behavior before integrating.

Debug authentication

Try different tokens or auth schemes against a protected endpoint to isolate auth failures.

Inspect production responses

Send a quick request to a live endpoint to verify whether a bug is in the client or server.

Validate webhook payloads

POST sample payloads to a webhook URL to confirm it parses your data correctly.

Features at a glance

All HTTP methods supported
Custom headers and request bodies
Pretty‑printed JSON responses
Response timing and size metrics
No proxy server — direct browser calls
Save and reuse requests
Dark mode for late‑night debugging
Works with any public or local API

Frequently asked questions

How do I test a regular expression online?

Use our Regex Tester tab. Enter your regex pattern and test string — matches are highlighted instantly with group capture details shown below.

Can I validate JSON online for free?

Yes. Our JSON Validator tab checks your JSON for syntax errors, formats it with proper indentation, and highlights any issues with line numbers.

How do I decode a JWT token online?

Paste your JWT token into the JWT Decoder tab. The header, payload and signature are decoded and displayed in readable JSON format.

Can I test API endpoints directly in the browser?

Yes. Our API Tester lets you send GET, POST, PUT and DELETE requests, add custom headers and request bodies, and inspect response data.

Your privacy matters

Debug Testing Tool runs entirely in your web browser. Your files, text, and data are never uploaded to any server, never stored, and never seen by us or any third party. This client-side architecture means you can safely process confidential business documents, personal records, and proprietary data without privacy concerns.