About JWT Decoder and Verifier

JWT (JSON Web Token) is a compact, URL-safe means of representing claims to be transferred between two parties. This tool allows you to decode JWT tokens to inspect their header and payload data, and verify their signatures.

Key features:

• Decode JWT tokens to view header and payload information
• Verify JWT signatures using various algorithms (HS256, RS256, etc.)
• Support for both symmetric (HMAC) and asymmetric (RSA, ECDSA) algorithms
• Option for Base64-encoded secrets

JWT structure:

• Header - Contains the token type and signing algorithm
• Payload - Contains the claims or assertions
• Signature - Verifies the token hasn't been tampered with

This tool performs all operations in your browser - no data is sent to any server.