Decode and inspect JWT tokens. View header, payload, and signature information. Perfect for debugging authentication tokens and API testing.
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Paste a JSON Web Token above to decode and inspect its contents.
Inspect and debug JSON Web Tokens easily
Decode JWT tokens instantly
All processing happens in your browser
See header, payload, and signature
Check expiration and structure
Understanding JSON Web Tokens
JWT consists of three parts: Header, Payload, and Signature, separated by dots (.) and encoded in Base64URL.
JWTs can be signed using a secret (HMAC) or a public/private key pair (RSA or ECDSA) to verify integrity and authenticity.
Commonly used for authentication, authorization, and secure data exchange between parties in web applications and APIs.
Everything you need to know about JWT tokens
JWT (JSON Web Token) is an open standard for securely transmitting information between parties as a JSON object. It is compact, URL-safe, and digitally signed.
A JWT has three parts: Header (contains token type and signing algorithm), Payload (contains claims), and Signature (verifies the token's integrity).
Standard claims include: iss (issuer), sub (subject), aud (audience), exp (expiration time), nbf (not before), iat (issued at), and jti (JWT ID).
Yes, all processing happens locally in your browser. Your JWT tokens never leave your computer, ensuring complete privacy and security.
This tool decodes and validates the JWT structure but does not verify signatures as that requires the secret key. Signature validation requires the secret or public key used to sign the token.
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