JWT Decoder

Paste a JWT token to decode its header and payload. Check expiration status instantly.

What is JWT?

JSON Web Token (JWT) is a compact, URL-safe token format used for authentication and information exchange. It consists of three parts: Header.Payload.Signature. This tool decodes the header and payload but does not verify the signature (which requires the secret key).

JWT Decoder — Decode JSON Web Tokens Online

Decode and inspect JWT tokens instantly. View header, payload, and signature parts with syntax highlighting.

How to Use

  1. Paste JWT — Copy token from Authorization header or elsewhere.
  2. Auto-decode — Token is decoded automatically as you type.
  3. Review parts — See header, payload decoded separately.

Features

  • Auto-decode on paste
  • Syntax highlighted JSON view
  • Support HS256, HS384, HS512, RS256, RS384, RS512
  • Signature verification

Use Cases

  • Debugging authentication issues
  • Inspecting token claims
  • Learning JWT structure

FAQ

What is a JWT?

JWT (JSON Web Token) is a compact token format for securely transmitting information between parties.