JWT Decoder Online — Decode & Inspect JWT Tokens
Decode and inspect JSON Web Tokens instantly. View header, payload, and expiry. Fully client-side — your token never leaves your browser.
Decode and inspect JSON Web Tokens instantly. View header, payload, and expiry. Fully client-side — your token never leaves your browser.
This free online JWT decoder decodes JSON Web Tokens and displays the header, payload, and expiry information in a clear, readable format. A JWT consists of three base64url-encoded parts — header, payload, and signature — separated by dots. This tool decodes the header to show the algorithm (RS256, HS256, ES256, etc.) and the payload to reveal all standard claims (exp, iat, nbf, sub, iss, aud) and any custom claims. It does not verify the signature, as that requires the secret key or public key used to sign the token. If an exp claim is present, the tool computes whether the token has expired based on the current time and shows the expiry date in a human-readable format. Decoding happens entirely in your browser — your token is never sent to any server.