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Securely decode and inspect JSON Web Tokens entirely in your browser.
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. Our Free JWT Decoder parses encoded JWT strings into human-readable Header, Payload, and Signature components directly inside your web browser. Because token parsing happens client-side using native JavaScript, your sensitive credentials and authentication tokens are never transmitted to any external server.
Paste your raw, base64-encoded JSON Web Token (ey...) into the input text area.
The tool automatically splits the token into three parts: Header, Payload, and Signature.
Inspect decoded claims like issuer (iss), expiration date (exp), user IDs, and permissions in formatted JSON.
Copy the formatted JSON payloads directly for debugging API authentication flows.
100% Client-Side Processing: Tokens remain completely private in your browser memory.
Real-Time Decoding: Instant JSON formatting as you type or paste.
Algorithm & Claim Inspection: Decodes RS256, HS256, ES256, and custom headers.
Zero Dependencies & Completely Free: Unlimited JWT parsing without sign-ups.