Online JWT Decoder & Token Inspector

Decode JSON Web Tokens (JWT) client-side. Inspect algorithm, payload claims, timestamps, and validity status with 100% privacy.

100% Client-Side — your text never leaves this browser. Works offline. How it works

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Social media limits

Top keywords

Type or paste text to see keyword frequency
About this tool

About the JWT Decoder

Decode and inspect JWT headers, payload claims, and signature algorithm 100% in-browser. Check token expiration dates with zero server leaks.

Complete JWT Parsing

Separates token into header, payload, and signature with JSON syntax formatting.

Timestamp Decoders

Automatically decodes exp (Expires At), iat (Issued At), and nbf (Not Before) into readable local and UTC dates.

Validity & Expiry Status

Displays whether the token is currently active or expired with relative countdown time.

100% Client-Side Privacy

Your tokens and secrets never leave your browser memory. Safe for sensitive production tokens.

FAQ

Common questions

What is a JSON Web Token (JWT)?

A JWT is an open RFC 7519 standard that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.

Can SnipFerry decode encrypted JWTs (JWE)?

SnipFerry decodes standard signed JWTs (JWS). Encrypted tokens (JWE) require the recipient's private key to decrypt the payload.

Does SnipFerry verify the signature secret?

SnipFerry inspects the signature algorithm and decodes the claims client-side without storing or asking for your private HMAC/RSA secret key.

Is it safe to paste production tokens here?

Yes! All token decoding happens 100% in your local browser using client-side JavaScript. No tokens are sent over the network.

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