JWT Decoder

Paste a token — see the header, claims and expiry decoded instantly. Nothing is transmitted.

Quick answer: Free JWT decoder: decode JSON Web Token header and payload, inspect expiry (exp) and issued times. Client-side only — tokens never leave your browser.

Header Payload (claims) Signature (not verifiable client-side)

How to use

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About this tool

A JSON Web Token has three dot-separated Base64URL parts: header (algorithm), payload (claims) and signature. This decoder reveals the header and payload with human-readable iat/exp/nbf timestamps. Decoding is not verification — the signature can only be validated with the secret/public key on a server. Never paste production tokens anywhere you don't trust.

FAQ

Does decoding verify the token?

No — decoding just reads it. Verification requires the signing key and must happen server-side.

Is it safe to paste my token here?

Processing is local (no network), but treat tokens like passwords — use test tokens where possible.

What is the exp claim?

Expiry time as a Unix timestamp. Expired tokens must be rejected by the server.

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The complete jwt decoder guide

Prefer the long version — a worked example, the mistakes people actually make, and answers to real questions? The blog guide Jwt Decoder — Complete Guide, Mistakes & FAQ covers all of it step by step.

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JWT Decoder

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The complete jwt decoder guide