JWT Decoder & Validator
Decode, inspect, and validate JSON Web Tokens in your browser. What you enter stays in your browser.
Paste a JWT above to decode it
Your JWTs are decoded locally in your browser, and this tool doesn't send them to our servers.
JWT Decoding FAQ
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe token format used for authentication and authorization. It consists of a header, payload, and signature separated by dots.
Is my token safe here?
Yes. It runs in your browser and doesn't send your JWT to our servers. All decoding happens locally using JavaScript.
What parts does a JWT have?
A JWT has three parts: the Header (algorithm and token type), the Payload (claims like user ID, expiration), and the Signature (verification hash). Each part is Base64URL-encoded.
What are JWT claims?
Claims are key-value pairs in the payload. Standard claims include: iss (issuer), sub (subject), aud (audience), exp (expiration), iat (issued at), nbf (not before), and jti (unique ID).
Need to share secrets securely?
Don't paste API keys or tokens into chat. Use CredenShare to deliver sensitive data with AES-256 encryption and automatic expiration.