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JWT Parser
Decode JSON Web Tokens (JWT) locally to inspect header and payload claims safely. Your tokens are never uploaded to any server.
Encoded JWT
Tokens are parsed locally in your browser and never sent to any server.
Frequently Asked Questions (FAQ)
What is a JWT (JSON Web Token)?
JWT is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
Is my token sent to any server?
Absolutely not! Our tool runs entirely using client-side JavaScript within your web browser. Your token is decoded instantly on your device and no data is ever transmitted across the internet.
What is the structure of a JWT?
A JWT always consists of 3 parts separated by dots
.: Header (Contains the signing algorithm and token type), Payload (Contains the actual claims/data such as user ID, roles, and expiration time), and Signature (Used to verify that the token hasn't been tampered with).Why is my token showing as invalid?
An invalid token is usually caused by: missing dot
. separators, containing characters not part of the Base64Url standard, or the decoded data not forming a valid JSON string.