UD5 Toolkit
CORS Header Debugger - Online Check Cross‑Origin Access
Enter a URL and see its CORS headers. Understand why a fetch fails. Check preflight responses. Client‑side debugger.
Tag: Debugger - Code & Network
3+ toolsOpen Graph Debugger - Online Fetch & Preview Social Card
Enter a URL to see exactly what Open Graph and Twitter card tags will be shown when shared on social media. Fetch from browser.
JWT Debugger - Online JSON Web Token Decoder & Verifier
Decode the header and payload of a JSON Web Token (JWT) without verifying the signature. Inspect claims securely on the client side. Great for developers.