The coding language predominantly used for developing web servers is JavaScript, particularly with frameworks like Node.js. JavaScript allows developers to build scalable and fast server-side applications, leveraging its asynchronous capabilities. This language facilitates interactions with databases and supports real-time data processing, making it suitable for modern web applications. Other languages like Python and PHP are also used, but JavaScript's popularity in both front-end and back-end development has solidified its role as the primary language for web server development. Its versatility and active community further enhance its appeal to developers.