100% local processing — your files and data never leave this browser. No uploads, no server storage.
Free · Browser-only · No upload
Use this jwt decoder to decode jwt header and payload instantly — a practical way to jwt token decode during API debugging. Whether you need to decode jwt token online or run a quick token decode on an access token, everything stays local for secure jwt decode online workflows.
Signature (base64url, not verified)
SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5cA JSON Web Token is three base64url segments: header, payload, and signature. This jwt decoder splits the string and pretty-prints the first two parts so you can confirm the algorithm, audience, scopes, and user id without leaving the browser — the same outcome people expect when they jwt token decode in devtools.
OAuth access tokens and session cookies often arrive as opaque strings until you decode jwt token and inspect exp, iss, and custom claims. Paste from Postman, curl, or your app logs to decode jwt token online before fixing clock skew or wrong environments.
Teams search decodejwt, jwt online decode, or json web token decode online for the same task. This page performs token decode locally so tokens are not uploaded — important when you need a quick decode token check on staging credentials.
JWTs are usually signed, not encrypted. Decoding reveals the payload to anyone holding the token; only signature verification proves integrity. True encryption (JWE) needs a separate key and format — if you only need to read claims from a standard three-part token, decode jwt here is the right step, not decryption.
No network calls are made when you decode. Use it like a local jwt decode online scratchpad — but rotate any token you pasted from production after debugging.
Common questions
Signature verification, Bearer tokens, and what “decrypt” usually means.
No. It only base64-decodes the header and payload so you can inspect claims. Signature verification requires your app's secret or public key and is intentionally not performed here.
Most searchers mean read the payload. Standard JWTs are signed (JWS), not encrypted — anyone with the token can decode the payload. Encrypted JWTs (JWE) use five segments and need a decryption key; this tool targets common three-part tokens.
Yes. Leading Bearer prefixes are stripped automatically before parsing.
Usually the string is truncated, not URL-safe base64, or not JSON in a segment. Copy the full token from your network tab or auth response without line breaks.
No. Decoding uses atob and JSON.parse in your browser only. Still avoid pasting production tokens on shared machines — treat them like passwords.
exp is expiration time (Unix seconds). iat is issued-at. The tool shows human-readable dates when those claims are numeric timestamps.