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Test JSON APIs (Client-Side)
Send GET/POST requests and inspect the response. Great for quick checks — with the usual browser CORS limitations.
Headers (one per line)
Body
Response
Status: —
Headers
Body
How to use this tool
- Choose an HTTP method and URL.
- Set headers and body if needed.
- Send the request and inspect the response.
How to Use
Enter a URL, add headers/body, then send the request. If a request fails, it may be blocked by CORS.
How It Works
Requests are made using the browser fetch API. Responses are displayed as text or pretty-printed JSON when possible.
Key Features
- GET/POST/etc
- Headers + body
- Pretty JSON responses
Secure & Private
Requests come from your browser. Be careful with API keys and tokens in shared environments.
Frequently Asked Questions
Why do I get a CORS error?
Many APIs do not allow browser-origin requests. You may need to call the API from your own backend in those cases.
Does this store my headers or tokens?
No. Inputs stay in-memory in your browser session.
Related Tools
Privacy Notice
All processing happens inside your browser. No files or data are uploaded to our servers, ensuring your privacy is strongly protected.