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JWT Decoder

Decode and inspect JSON Web Tokens (JWT) instantly. View header metadata, payload claims, and expiration timestamps — 100% client-side in your browser.

Need to format raw JSON objects or decode Base64 strings? Try our JSON Formatter or Base64 Encode / Decode Tool .

How to Decode a JWT Token

  1. Paste your full JWT string (with or without the Bearer prefix) into the input box above.
  2. The decoder automatically splits and parses the Header, Payload, and Signature segments.
  3. Check human-readable timestamps for exp (Expiration), iat (Issued At), and nbf (Not Before) claims.

Standard JWT Registered Claims

Claim Full Name Description
iss Issuer Identifies the principal or authentication server that issued the JWT
sub Subject Unique user ID or entity that the token represents
aud Audience Intended recipient API or application for the token
exp Expiration Time Unix timestamp after which the token must no longer be accepted
iat Issued At Unix timestamp indicating when the token was generated

Frequently Asked Questions

Is my JWT sent over the network when decoding?

No. Everything runs 100% locally in your browser. Your authentication tokens are never transmitted to any server.

Why shouldn't I put sensitive secrets inside a JWT payload?

JWT payloads are encoded with Base64URL, which is trivially reversible by anyone who intercepts the token. A JWT's signature prevents tampering, not reading.