JWT Decoder

Decode JWT header and payload data locally, inspect common claims and expiration, and clearly distinguish decoding from signature verification.

TOKENS

LOCAL NO DATA SENT

JWT INSPECTION BENCHHEADER / PAYLOAD / CLAIM TIMES

TOKENPASTE A JSON WEB TOKEN TO DECODE IT LOCALLY

JWT

Decoding only reads Base64URL-encoded data. It does not prove that the token is authentic or that the signature is valid.

ALGORITHM—

TYPE—

EXPIRATION—

SIGNATURE—

HEADERDECODED JSON

—

PAYLOADDECODED CLAIMS

—

REGISTERED CLAIMSCOMMON TIME AND IDENTITY FIELDS

READYPaste a token to inspect its header and payload.

LOCAL TOOL: Your token stays in your browser. Do not treat decoded contents as trusted until the token's signature, issuer, audience, algorithm, and policy requirements have been verified by the receiving application.

FIELD NOTE / 070

A JWT decoder is an inspection tool, not a signature validator.

JWT header and payload sections are Base64URL-encoded rather than encrypted. Anyone holding the token can usually read those sections. Signature verification requires the correct key and validation rules and is intentionally outside this decoder.

A JWT decoder is an inspection tool, not a signature validator.

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