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This article delves into common issues and solutions when POSTing an array of objects using the $.ajax method in jQuery or Zepto. By analyzing the phenomenon where data is incorrectly serialized into "bob=undefined&jonas=undefined" in the original problem, it reveals the mechanism by which these libraries default to converting arrays into query strings. The core solution involves manually serializing data with JSON.stringify() and setting contentType to 'application/json' to ensure data is sent in proper JSON format. It also discusses strategies for handling strict server-side data structure requirements, providing complete code examples and best practices to help developers avoid common pitfalls and achieve efficient data transmission.