JWT Decoder
Decode a JSON Web Token to inspect its header and payload. Paste a token to see its contents and expiry status instantly, entirely in your browser.
How to Use JWT Decoder
- 1
Paste your JWT into the input box.
- 2
The header and payload are decoded automatically.
- 3
Check the expiry status and copy either part as JSON.
JWT Decoder Features
- Decodes header and payload instantly.
- Flags expired tokens using the exp claim.
- Fully client-side — your token never leaves your browser.
Why use Tool King?
Fast
No waiting rooms or sign-ups. Most files are ready in seconds.
Private
Files are processed in memory and discarded right after — never stored or shared.
Free
Every tool is free to use, with no hidden limits on the essentials.
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