Free Online JWT Decoder & Inspector
Decode & inspect JSON Web Tokens
About JWT Decoder
Decode and inspect JSON Web Tokens without sending them to a server. View the header, payload, and signature. Check expiration times and claims — all client-side.
How to Use JWT Decoder
- 1
Paste your JWT
Enter the full JWT string (header.payload.signature).
- 2
Inspect claims
The decoded header and payload are displayed with formatted JSON.
- 3
Check expiration
Expiration and issued-at timestamps are converted to readable dates.
Frequently Asked Questions
Is my data safe?
Yes. All processing happens entirely in your browser. Your data never leaves your device and is never uploaded to any server.
Does this tool verify JWT signatures?
This tool decodes and displays JWT contents. It does not verify signatures since that requires the signing secret or public key.
Is it safe to paste my JWT here?
Yes. The token is decoded entirely in your browser and never sent to any server.