JWT Decoder

Name: JWT Decoder
Author: Nahlawi Tools

Decode and inspect JSON Web Tokens — view header, payload, and signature with expiry analysis

ℹ️ About JWT Decoder

Decode and inspect JSON Web Tokens (JWTs) to view their header algorithm, payload claims, and signature section. Analyze token expiry (exp), issuance time (iat), and subject (sub) fields. Validates Base64url encoding and highlights expired tokens. Follows RFC 7519 JWT standards.

❓ Frequently Asked Questions

What is a JWT?▸

A JSON Web Token is a compact, URL-safe token format consisting of three Base64url-encoded parts: a header, a payload, and a signature. It is commonly used for authentication and authorization in web applications.

Can this tool verify JWT signatures?▸

No, this tool decodes and displays JWT contents but does not cryptographically verify signatures. Signature verification requires the secret key or public key from the token issuer.