JWT Encoder/Decoder
Encode and Decode JSON Web Tokens (JWT)
Decode and inspect JSON Web Tokens (JWT) to view their header and payload.Perfect for debugging authentication tokens and understanding token structure.
- Decode JWT header and payload
- Format timestamps to readable dates
- Validate token structure
- Copy decoded data as JSON
- Client-side processing - tokens stay private
JWT Structure:
Header: Algorithm & token type
Payload: Claims/data (not encrypted)
Signature: Verifies token authenticity
About JWT Encoder/Decoder
Encode and Decode JSON Web Tokens (JWT)
How to Use
Use this tool to encode and decode json web tokens (jwt). Simply input your data and get instant results.
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Frequently Asked Questions
What is a JWT?
JWT (JSON Web Token) is a compact, URL-safe token format used for securely transmitting information between parties. It is commonly used for authentication and information exchange in web applications.
What are the parts of a JWT?
A JWT consists of three parts separated by dots: Header (algorithm and token type), Payload (claims/data), and Signature (verification signature). All three are base64url encoded.
Can I decode a JWT without a secret key?
Yes, you can decode the header and payload without a secret key since they are only base64url encoded (not encrypted). However, you cannot verify the signature without the key.
Is it safe to decode JWTs online?
JWTs should not contain sensitive data in the payload since it is only base64 encoded (not encrypted). However, for maximum security, decode JWTs locally using trusted tools.
What is JWT used for?
JWTs are commonly used for user authentication, authorization, information exchange, and session management in modern web applications and APIs.