A comprehensive comparison of three popular JavaScript testing frameworks: Jest, Mocha, and Jasmine. Jest offers zero-configuration setup with built-in mocking and assertions, making it ideal for React projects and beginners. Mocha provides flexibility through its modular approach, requiring external libraries like Chai for assertions but excelling in complex Node.js applications. Jasmine features built-in matchers and BDD support, particularly suited for Angular development. The choice depends on project requirements: Jest for React/smaller projects, Mocha for large Node.js applications requiring customization, and Jasmine for Angular projects or when built-in assertion libraries are preferred.