JWT Encoder & Decoder

Encode and decode JSON Web Tokens (JWT).

Paste JWT Token:

Header:

Payload:

Expiration: Expired Valid

Header (JSON):

Payload (JSON):

Secret Key (for signing): Note: This is a demonstration. Real JWT signing requires proper cryptographic libraries.

Generated JWT:

Features

Decode JWT tokens to view header and payload
Encode custom JWT tokens with header and payload
Display token expiration status
Pretty-print JSON for easy reading
Support for custom secret keys
Client-side processing for privacy
Educational tool for understanding JWT structure

How to Use

To Decode: Paste a JWT token in the decode tab
View the decoded header and payload
Check the expiration status if present
To Encode: Switch to the encode tab
Enter header and payload as JSON
Optionally provide a secret key
Click Generate JWT and copy the result