JSON LAB / BROWSER TOOLS
JWT Decoder
Inspect JWT headers and payload safely in your browser.
What you can do
- Decode header and payload.
- No token is sent to a server.
- Copy decoded JSON easily.
- Useful for debugging auth flows.
Questions, answered
Does decoding verify signature?
No. Decoding shows the token contents. Use a verifier to validate signatures.
Is it safe to paste tokens?
Treat tokens as secrets. This tool is client-side, but avoid pasting real production tokens.