EduSupport

JWT Decoder

Decode and inspect JWT tokens — header, payload, and expiry status. No data leaves your browser.

This tool only decodes the token (base64url). It does not verify the signature — never paste production secrets.

JWT Anatomy — 3 dot-separated Base64 parts

eyJhbGc…HEADERalg, type

eyJzdWI…PAYLOADclaims, exp

SflKxwR…SIGNATUREverifies token

header . payload . signature