JWT•100% Client-Side

JWT Decoder Online

Decode and inspect JSON Web Tokens (JWT) client-side. Instantly extract token algorithms, expiration dates, issue dates, and metadata payloads securely without sending tokens to any server.Reference Spec: IETF RFC 7519 (JSON Web Token Specification)→

Encoded JWT (Paste Token)

Waiting for Token...

Paste an encoded JWT in the left editor to decode headers and claims.

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Frequently Asked Questions (JWT Decoder)

What is a JSON Web Token (JWT)?

A 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.

Does decoding a JWT online compromise my security?

Using our JWT Decoder is completely safe because decoding happens entirely in your browser using local client-side Javascript. Your token is never uploaded, logged, or sent to a server.

How is a JWT structured?

A JWT is composed of three parts separated by dots (Header.Payload.Signature). The Header specifies the algorithm and token type, the Payload contains claims (like user info and expiration), and the Signature is used to verify the sender and integrity.

Does this tool verify the JWT signature?

No. Signature verification requires the corresponding secret key or public certificate. This tool decodes the token claims client-side to inspect payload values but does not verify cryptographic authenticity.

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