JWT Decoder & Debugger
Decode and inspect a JSON Web Token. Header, payload, claims, expiry — in your browser.
Paste a JWT to decode its header and payload and check standard claims (exp, iat, nbf, iss, aud). Everything runs locally — nothing is sent anywhere.
100% client-side — nothing is sent anywhere.
Runs entirely in your browser — nothing you enter is sent to a server.
Need this for real, on your stack?
These free tools are a taste of how we think. We’re a senior software team across Romania & Pakistan that ships deep technical work — platforms, infra, data and the gnarly bits in between.
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Decoding happens entirely in your browser with no network calls. Still, never paste production tokens into any online tool out of habit — rotate anything you test.
What it does not do
This decodes; it does not verify the signature (that needs the signing key/secret). An unverified JWT is just claims a client asserts.
Built by WeWorkWorldwide — a senior software team in Romania & Pakistan that ships deep technical work. Need this turned into something production-grade for your stack? Talk to our engineers →