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Decode, Validate & Analyze JSON Web Tokens
A powerful tool for decoding and analyzing JSON Web Tokens (JWT). Inspect token headers, payloads, and signatures with real-time validation and expiration tracking.
The JWT Decoder provides a comprehensive interface for analyzing JSON Web Tokens. Whether you're debugging authentication issues, verifying token contents, or learning about JWT structure, this tool has you covered.
Tip: Use the "Load Sample Token" button to see an example JWT and explore all the features of the tool.
The token input section provides a clean interface for pasting and managing your JWT input.
Paste your JWT token into the textarea. The token will be automatically decoded as you type or paste.
Quick actions for common operations:
JWTs consist of three parts separated by dots: Header·Payload·Signature
Real-time validation feedback helps you quickly understand the state of your JWT.
The token is properly formatted and has not expired. All claims can be read and analyzed.
The token structure is valid but the expiration time (exp) has passed. The token should not be accepted.
The token does not match the expected JWT format. Check that it has exactly three parts separated by dots.
The overview section provides quick insights into the most important aspects of your JWT.
The cryptographic algorithm used to sign the token:
HS256, RS256, ES256, etc.Time remaining until the token expires:
2d 5h, 1h 30m, Expired, etc.The entity that issued the token (iss claim):
example.com, auth0, etc.The principal that is the subject of the token (sub claim):
user_id, email, etc.The JWT Decoder displays three decoded sections in a tabbed interface: Header, Payload, and Signature.
Contains metadata about the token:
Contains the claims (statements about the entity):
The cryptographic signature:
Standard JWT Claims
The payload may contain registered claims (iss, sub, aud, exp, iat, nbf), public claims (registered with IANA), or private claims (custom for your application).
JWT is decoded instantly as you paste or type, with no need to click a decode button.
Automatically calculates and displays time remaining until expiration with live updates.
Visual indicators show whether the token is valid, expired, or has invalid format.
One-click copy buttons for the token, header, payload, and signature sections.
Load a sample JWT to explore all features and understand the token structure.
Header and payload are displayed as pretty-printed JSON for easy reading.
When authentication fails, decode the JWT to check if the token is valid, expired, or contains incorrect claims.
Examine the contents of a JWT to understand user identity, permissions, and token metadata.
Review tokens for security issues like overly long expiration, weak algorithms, or sensitive information in payload.
Verify that tokens generated by your auth system contain the expected claims and values.
New to JWT? Use the tool to explore sample tokens and understand the header, payload, and signature format.
When working with APIs that use JWT authentication, decode tokens to debug request issues.