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JWT Decoder
Processed Locally
Decode and analyze JWT tokens. View header, payload, and token information without verification.
This tool only DECODES JWT tokens. It does NOT verify signatures. Never trust unverified tokens.
Frequently Asked Questions
JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. It consists of three parts: header, payload, and signature, separated by dots.
No. This tool only decodes and displays the JWT content. It does NOT verify the signature. To verify a token, you need the secret key and proper cryptographic libraries. Never trust the content of an unverified JWT.
Yes! All decoding happens locally in your browser. We never send your token to our servers. However, be aware that anyone with your token can decode it. Keep your tokens secure and never share them publicly.
JWT tokens can include an expiration time (exp claim). If the current time is past the expiration time, the token is considered expired and should not be accepted. This is a security feature to limit token lifetime.
Common algorithms include HS256 (HMAC with SHA-256, symmetric), RS256 (RSA with SHA-256, asymmetric), and ES256 (ECDSA with SHA-256, asymmetric). The algorithm is specified in the JWT header. Avoid using "none" algorithm in production.