JWT, or JSON Web Token, is an open standard that defines a compact and self-contained way for securely transmitting information between parties as a JSON object.

Is my JWT sent to a server?

No. This tool parses and decodes the token entirely in your browser using JavaScript. No data is sent to any server, so your sensitive token contents remain local to your machine.

Does this tool verify the signature?

No, this tool simply decodes the base64-encoded header and payload to make them human-readable. It does not verify the cryptographic signature.

ASAPUtils

JWT Decoder Online — View JSON Web Tokens

Free browser-based JWT Decoder. Decode JSON Web Tokens locally to view the header and payload. 100% client-side — data never leaves your browser.

JWT String

Header (Algorithm & Token Type)

Payload (Data)

JSON Web Token (JWT) Decoder

This free online tool allows you to easily decode JSON Web Tokens (JWTs) and view their contents without sending your sensitive token data to a remote server.

A standard JWT consists of three parts separated by dots (.):

Header: Contains metadata about the token, such as the cryptographic algorithm used.
Payload: The actual data (claims) carried by the token.
Signature: Used to verify that the sender of the JWT is who it says it is and to ensure that the message wasn’t changed along the way.

Simply paste your JWT into the input box to instantly inspect the header and payload objects. Because this tool operates entirely inside your web browser, it is a safe and private way to debug your authentication tokens.