JWT Decoder
Decode JSON Web Tokens (JWT) instantly. View Header, Payload, and Signature. Detects expired tokens. All processing happens client-side.
Examples of use
- Debug and inspect JWT tokens from API responses
- Verify token claims and expiration dates
- Understand the structure of authentication tokens
When to use this tool?
- When debugging authentication issues in API calls
- When you need to inspect token contents quickly
- When checking if a JWT token has expired
- When learning about JWT structure and claims
Frequently asked questions
- What is a JWT?
- A JWT (JSON Web Token) is a compact, URL-safe means of representing claims between two parties. It consists of three parts: header, payload, and signature, separated by dots.
- Does this tool validate JWT signatures?
- No. This tool only decodes the token contents for inspection. It does not verify the cryptographic signature, as that requires the signing key.