Decode, read, and verify JWTs in a tap — entirely on your device. No network. No tracking. Nothing stored.
Built for developers debugging OAuth and OIDC flows, inspecting bearer tokens, or just learning how JWTs work.
Pretty-printed header and payload, with the classic three-part coloring so structure is obvious instantly.
exp, iat and nbf in your local time with “expires in 59 minutes”, plus a valid / expired badge.
Check HS, RS, PS and ES signatures with your secret or public key — computed locally with WebCrypto.
Pull a token straight from the text you’ve selected on a page, and copy any part with one tap.
Follows your system appearance, and reads beautifully either way.
Plain-English descriptions of standard claims like iss, sub and aud.
JWT Lens makes no network requests. Your tokens and keys are never sent anywhere, never stored, never logged. The whole tool runs in the popup and forgets everything when you close it.