How to Decode JWT Token Online Free
Our free JWT decoder tool allows you to decode and analyze JSON Web Tokens instantly in your browser. Simply paste your JWT token, and our tool will automatically parse the header, payload, and signature sections. No secret key required for decoding - perfect for debugging and analyzing JWT tokens during development.
JWT Token Analyzer Without Secret Key
This JSON Web Token decoder tool works entirely in your browser and doesn't require the secret key to decode the token structure. You can analyze the token header to see the algorithm used, examine the payload for claims and user data, and verify the token format without compromising security.
Decode JWT Token Header Claims
View detailed information about your JWT token including the header algorithm (RS256, HS256), token type, payload claims (sub, iat, exp), and expiration times. Our JWT debugger tool helps you understand token structure and troubleshoot authentication issues quickly.
JWT Token Validator Online Free
Validate JWT token structure and format with our online validator. Check if your token is properly formatted, examine expiration dates, and identify any structural issues. Perfect for developers working with authentication systems and API security.
Frequently Asked Questions
What is a JWT token?
JWT (JSON Web Token) is a secure way to transmit information between parties as a JSON object. It consists of three parts: header, payload, and signature, separated by dots.
How to decode JWT token online?
Simply paste your JWT token into our decoder tool. It will automatically parse and display the header, payload, and signature in a readable JSON format without requiring a secret key.
Can I decode JWT without secret key?
Yes! You can decode and read JWT token contents without the secret key. The secret key is only required for verifying the token signature, not for decoding the header and payload.
Is this JWT decoder tool secure?
Absolutely! All JWT decoding happens in your browser. Your tokens never leave your device, ensuring complete privacy and security when analyzing sensitive authentication data.
What information can I see in a JWT?
You can see the algorithm used (header), user claims like user ID and roles (payload), issue time (iat), expiration time (exp), and other custom claims added by your application.
How to check if JWT token is expired?
Our JWT decoder automatically shows the expiration time (exp claim) and indicates whether the token is currently expired, making it easy to debug authentication issues.