JWT Decoder
RFC 7519Decode JWT tokens client-side instantly. Use this free online jwt decoder and jwt parser to inspect headers, payloads, and claims without sending data to servers.
Paste a JWT token above - it will decode automatically.
What is a JWT and how is it structured under RFC 7519?
This tool operates as a versatile jwt decoder and decode jwt online. A JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties, defined by the RFC 7519 standard. The structure consists of three base64url encoded parts separated by periods - the Header, the Payload, and the Signature. Our JWT decoder inspects these parts directly within your browser window.
Why is signature verification important for JSON Web Tokens with DECODE JWT ONLINE
While a JWT parser allows you to decode JWT online to view its public claims, you should never trust the claims unless you verify the signature. The signature ensures the payload has not been tampered with. This page displays the token details but does not perform verification.
How does this client-side JWT parser protect your privacy?
Authorization tokens often contain sensitive corporate metadata and user details. Because this json web token decoder executes 100% inside your web browser using local Javascript, your token is never sent over the internet or logged on any external server.
Frequently Asked Questions
How do I use this jwt decoder?
This jwt decoder parses the token segments (header, payload, and signature) locally in your browser so your sensitive authorization credentials never leave your machine.
Is decoding a JWT the same as verifying it?
No. Decoding a JWT simply parses the Base64URL-encoded segments to view the JSON content, which anyone can do. Verifying a JWT, however, cryptographically validates the token's signature using a secret or public key to ensure it hasn't been altered.
What's inside a JWT payload?
A JWT payload contains 'claims,' which are statements about an entity (typically the user) and additional metadata. Standard claims include issuer (iss), subject (sub), audience (aud), expiration time (exp), and issued-at time (iat), alongside custom app data.