Building a RESTful API with AWS Lambda and Express

AWS Lambda is a serverless computing service that allows developers to run code without managing servers, and when combined with Node.js, it can be used to create a RESTful API triggered by events such as HTTP requests. The process involves setting up an environment with Node.js, a text editor or IDE, and a basic understanding of JavaScript, Express.js, and HTTP methods. The guide outlines steps to build a simple RESTful API using Express.js, including installing necessary libraries such as express and serverless-http, and demonstrates how to implement HTTP methods like GET, POST, PUT, and DELETE using an in-memory array to store data. Once the API is built, it can be tested using tools like Postman, and further enhancements can be made, such as securing the API with an API key or integrating with an API gateway. The text also mentions Moesif, a platform for API analytics and monetization, which can offer insights and enhance API management.