JWT Decoder for Developers
Instantly decode, inspect, and debug JWT tokens online. Secure, privacy-friendly JWT decoder.
Use this free JWT Decoder to instantly decode, inspect, and debug JSON Web Tokens (JWT) in your browser. Paste your JWT to view its header, payload, and signature. All decoding is performed locally for maximum privacy and security. No data is sent or stored. Perfect for developers, security engineers, and anyone working with authentication or API tokens.
Key Benefits
- Instant JWT decoding and inspection for developers and security professionals.
- All processing is local—your tokens never leave your browser.
- Supports all standard JWTs for debugging, learning, and troubleshooting.
Frequently Asked Questions
Yes. All decoding happens in your browser. Your JWT tokens are never sent to any server or stored anywhere.
A JWT (JSON Web Token) is a compact, URL-safe token used for securely transmitting information between parties as a JSON object. It is commonly used for authentication and authorization in web applications and APIs.
No. This tool only decodes the JWT and displays its contents. It does not verify the signature or validate the token authenticity or expiration.
Decoding JWTs helps you debug authentication issues, inspect claims, and understand what data is being transmitted in your applications or APIs.
A JWT consists of three parts: header, payload, and signature. The header defines the algorithm, the payload contains the claims, and the signature ensures integrity.