I mostly use charles to mock the api responses. It helps to complete edge case coding without waiting for backend to deploy changed responses to various kind of use cases and error codes.API debugging is also very simplified by using charles.

Charles Proxy is my go-to tool for identifying malicious traffic.It stores the cache to analyse the the traffic much faster and also used for API testing , SSL &TLS traffic inspection and also domain categorisation .

Charles Proxy's ability to intercept and inspect HTTP and HTTPS traffic allows users to view and modify requests and responses for detailed analysis and troubleshooting.