Token-based authentication is a widely adopted approach for securing APIs and web applications. It uses tokens to verify the identity of users or applications accessing a resource, providing a flexible, stateless, and scalable solution for modern systems. This guide outlines how to implement token-based authentication and shares best practices to secure your application effectively.
What is Token-Based Authentication?
Token-based authentication involves issuing a unique token to a user after successful authentication. The token acts as a digital key, granting the bearer access to specific resources or actions. It replaces traditional session-based authentication, making it ideal for applications requiring scalability, especially in distributed systems like microservices or APIs.
How it works:
- User Authenticates: The user provides credentials (e.g., username and password) to the authentication server.
- Token Issuance: If the credentials are valid, the server generates a token and returns it to the client.
- Client Sends Token: The client includes the token in the Authorization header of every request to access protected resources.
- Token Validation: The server verifies the token on each request. If the token is valid, the user is granted access.
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