JWT Decoder & Validator – Inspect Auth Tokens Instantly
Decode JSON Web Tokens to view headers, payload claims, expiration, and signature info while keeping everything private in your browser.
JWT Decoder
Decode JSON Web Tokens (JWT) to view header and payload
lightbulbPopular Use Cases
Decode Auth0 JWT tokens to inspect claims and permissions
Decode API access tokens to verify user identity and scopes
Decode OAuth2/OpenID Connect ID tokens
Decode session JWTs with user profile and metadata
Decoded JWT will appear here
scienceExample JWT Tokens
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4...
eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.eyJzdWIiOiIxMjM0NTY3ODkwIn0....
keyboardKeyboard Shortcuts
keyboardShow shortcutsexpand_more
Related tools
Show moreShow more
› About this tool · FAQ
Stop debugging JWT authentication blindly! Decode JSON Web Tokens instantly to inspect headers, payload claims, expiration times, and signatures. Perfect for troubleshooting auth issues and validating token structure. Free, works offline, never uploads your tokens.
How do I decode a JWT token?
Paste your JWT token into the decoder, and it instantly displays the header, payload claims, signature, and expiration time. The tool automatically validates the token structure and highlights expired tokens.
Is this JWT decoder free?
Yes, completely free with unlimited decoding. No signup required, no watermarks. All decoding happens in your browser for complete privacy.
Are my JWT tokens uploaded to servers?
No, all JWT decoding happens locally in your browser. Your tokens never leave your computer, ensuring complete privacy for production auth tokens and sensitive claims data.
What is a JWT?
JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three Base64-encoded parts: header, payload, and signature for secure authentication.
Can this tool verify JWT signatures?
This tool can decode and inspect JWT structure but cannot verify signatures since that requires the secret key or public key used for signing, which should never be shared for security reasons.
What are the three parts of a JWT?
Header (contains algorithm and token type), Payload (contains claims/data like user ID and expiration), and Signature (verifies the token hasn't been tampered with using a secret key).
What are JWT claims?
Claims are statements about an entity (typically the user) and additional data. Standard claims include iss (issuer), sub (subject), aud (audience), exp (expiration), and iat (issued at).
Is it safe to decode JWTs online?
For production tokens with sensitive data, use caution. This decoder works client-side only, but avoid pasting real tokens with personal or sensitive information in shared environments.