How to use
Choose a method, enter an HTTPS endpoint, optionally add query parameters, headers, or a body, then select Send. Results stay in your browser unless the target API receives them.
REQUEST
Send an HTTP request
Ready
Add query parameters. They are encoded and appended to the URL when you send.
Headers are sent directly from your browser. Some APIs may require CORS permission.
Body is disabled for this request type.
RESPONSE
Response
Your response will appear here
Enter an endpoint and press Send to inspect status, timing, headers, and response data.
Browser CORS
This tool uses the browser's native fetch(). Some APIs restrict browser-origin requests with CORS. If that happens, use a dedicated API client, command-line HTTP client, or another server-side testing environment that supports the API.
Privacy by design
No account or application backend is required. Request history is stored locally in your browser and can be cleared at any time.
Common questions
Can I test POST, PUT and PATCH APIs?
Yes. Select the method, choose a body type, enter the payload, and send. JSON requests automatically use Content-Type: application/json unless you provide a different content type.
Why does an API work in Postman but not here?
This is a browser-based tool, so the target server must explicitly allow cross-origin browser requests. If it does not, use a dedicated API client, command-line HTTP client, or another server-side testing environment instead.
Are my API keys uploaded to StackToZ?
The app has no StackToZ request proxy or server-side request handler. Headers and bodies are passed by your browser to the endpoint you specify. Avoid testing credentials against endpoints you do not trust.