Inspect a JWT
Displays a JWT’s header, payload and expiry. It does not verify the signature.
Shows the header and payload of a JSON Web Token in readable form and turns the expiry into a real date.
- Paste the token
- Decode
- Check the header, payload and expiry
The signature is deliberately NOT verified: that is impossible without the secret key, and a “looks valid” badge would be dangerously misleading. The token never leaves your browser — even so, do not paste real production tokens.
Frequently asked
What does it cost?
Every tool shows its price before you start. Tools marked free run in your browser and never cost anything — no sign-up needed.
What happens if processing fails?
You are not charged. We only charge when a result is actually produced; if the run fails, the charge is reversed.
What happens to my files?
Uploaded files are processed in memory for that one request and then discarded. We do not store them, and their contents never reach our logs or analytics.
Do you use my own API key?
No. Your BYOK key belongs to the Playground and is never used for these tools.