API Authentication
API authentication is a security mechanism that verifies the identity of clients or users accessing an application programming interface (API). It ensures that only authorized entities can interact with protected API endpoints, typically by requiring credentials, tokens, or cryptographic proofs. This process is fundamental for securing data, preventing unauthorized access, and enabling controlled resource sharing in distributed systems.
Developers should implement API authentication whenever building or consuming APIs that handle sensitive data, user accounts, or paid services to protect against breaches and misuse. Common use cases include user login systems in web/mobile apps, securing microservices communication, and enabling third-party integrations (e.g., OAuth for social logins). Without it, APIs are vulnerable to attacks like data theft or denial-of-service.