How to build a REST client with JavaScript proxies

Metaprogramming is a programming technique that enables a program to process other programs as its data, allowing it to read, generate, analyze, or modify them dynamically. A key feature of metaprogramming in JavaScript is the use of proxies, which act as intermediaries between an operation's target object and handler, allowing developers to intercept and redefine fundamental operations. This tutorial explores JavaScript proxies by building a weather forecasting application that utilizes proxy objects to manage and validate data from RESTful API calls. The tutorial explains the basics of proxy syntax, such as the set() and get() traps, which are used to modify and access target object properties, and demonstrates how these traps can be employed to fetch, validate, and display weather data. The article provides a step-by-step guide to creating the application, including setting up HTML and JavaScript files, and emphasizes the utility of proxies in ensuring full control over data, validating inputs, and enhancing application functionality.