JWT Inspector

Decode JWT tokens and analyze header, payload, signature, and expiration time with detailed validation.

ℹī¸ About JWT Tokens

JWT (JSON Web Token) consists of three parts:

  • Header: Contains metadata like algorithm and token type
  • Payload: Contains claims (user data, permissions, timestamps)
  • Signature: Cryptographic signature to verify authenticity
  • Each part is Base64 URL-encoded and separated by dots

How to use JWT Inspector

  1. 1
    Paste JWT token — Enter the complete JWT token in the input field.
  2. 2
    Click "Inspect JWT" — The tool will decode and analyze all parts of the token.
  3. 3
    Review analysis — Check the token overview, claims, and expiration status.
  4. 4
    Copy sections — Use the copy buttons to extract specific parts of the token.

The JWT Inspector runs entirely in your browser — your tokens never leave your machine. Only decodes tokens, does not verify signatures.