token validation

**Token Validation**

Token validation is the process of verifying the authenticity and integrity of a token, typically used in authentication and authorization systems. It ensures that the token is valid, has not expired, and has been issued by a trusted source. This is a crucial step in securing APIs, web applications, and services by confirming that only authorized users or systems can access protected resources. Common token types include JWT (JSON Web Tokens), OAuth tokens, and API keys. Proper token validation helps prevent unauthorized access, session hijacking, and other security vulnerabilities.