OAuth vs JWT vs API Keys: Which Authentication Should You Use?

When building APIs or integrating enterprise systems, authentication becomes one of the most critical aspects of system design. A poorly implemented authentication method can expose sensitive data, create security vulnerabilities, and damage business trust. Among the most commonly used authentication methods today are API Keys, JWT (JSON Web Tokens), and OAuth. Each method serves a different purpose and works best in different scenarios. In this article, we will explore how these authentication methods work, their advantages, and when developers should use them. Why API Authentication Matters Modern applications rely heavily on APIs to communicate between services, mobile apps, cloud platforms, and third-party systems. Without proper authentication, any unauthorized user could potentially access sensitive endpoints. A good authentication strategy ensures: • Only authorized users can access resources • Sensitive data remains protected • Systems remain secure from malicious requests • AP