JWT Decoder
Paste any JWT and instantly decode its header and payload into human‑readable JSON. The tool checks the `exp` (expiry) claim and clearly indicates whether the token is still valid or has already expired. Entirely browser‑side – your token never leaves your machine.
How to Use
- 1Paste a JWT string into the text area.
- 2Click the Decode button (or optionally enable auto‑decoding after every paste).
- 3View the decoded Header and Payload as prettified JSON, along with the Expiry Status (Valid / Expired / No expiration).
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Frequently Asked Questions
Is the signature verified?
No. This tool only decodes, it does not verify the cryptographic signature. It is meant for inspecting token contents, not validating trust.
What happens if there is no `exp` claim?
The status will display “No expiration claim” and the tool will not calculate an expiry time.
Can I use this with tokens from any provider?
Yes, as long as the token follows the standard JWT format (three base64url‑encoded segments separated by dots). Works for access, ID, and refresh tokens from Auth0, Firebase, Okta, etc.