Threat Modelling For Node.js Applications` is a methodical approach to identifying and prioritizing security threats against a Node.js application, using attack trees as a formal framework for describing the security of systems. Attack trees provide a structured way to represent attacks against a system, with the goal as the root node and different ways of achieving that goal as leaf nodes. By assigning values to these nodes, such as possible (P) or impossible (I), attackers can be identified and defenses targeted accordingly. This approach allows developers to make informed security decisions by identifying vulnerabilities in their application and prioritizing defenses based on potential impact and feasibility. By applying this method to a Node.js application, developers can create an attack tree that highlights areas of high risk and informs the development of effective security measures.