API testing is crucial for fullstack development, ensuring seamless communication between application components. It requires skills in HTTP fundamentals, API architecture, data formats, and testing methodologies. Tools like Postman, Insomnia, and REST Assured can streamline the process. Best practices include testing early, using varied tools, automating tests, and testing for security to deliver high-quality APIs that power exceptional user experiences.
RESTful APIs allow different systems to communicate over the internet, characterized by being resource-based, client-server, stateless, cacheable, and having a uniform interface, aiming to make web services scalable, flexible, and maintainable.
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