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JWT Decoder

Securely decode and inspect your JSON Web Tokens directly in the browser.

Encoded Token
Waiting for token...
Decoded Data

Header (Algorithm & Token Type)

{}

Payload (Data & Claims)

{}
Signature Status: Decoding does not verify signature.

Privacy First: This tool decodes JWTs entirely in your browser. Your tokens are never sent to our servers, keeping your sensitive payloads 100% private.

What is a JWT?

JSON Web Tokens (JWT) are an open, industry-standard (RFC 7519) method for representing claims securely between two parties. They are the backbone of modern stateless authentication.

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

  • Header: Contains the algorithm and token type.
  • Payload: Contains the claims (the actual data).
  • Signature: Used to verify the token hasn't been altered.

Security Warning

Base64 isn't Encryption

The Header and Payload are simply Base64Url encoded. Anyone who gets their hands on your token can decode and read the payload. Never put secret data (like passwords) in a JWT payload!

Decoding vs. Verifying

This tool decodes the token so you can read it. To ensure the token is legitimate, your server must verify the signature using your application's private Secret Key.

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