AJAX is a web technique enabling partial page updates without reloads by using JavaScript and XMLHttpRequest to fetch XML/JSON and dynamically change HTML/CSS. It powers fast, interactive UIs (autocomplete, live feeds, real-time booking), cuts server load, improves performance, and enables single-page apps. The article explains components, workflow, a travel search example, and suggests next steps and resources.
RabbitMQ is a popular open-source message broker for Node.js developers, enabling asynchronous communication between applications and services. Its key features include message routing, persistence, and high availability. Message queues offer benefits such as decoupling components, scalability, and fault tolerance when building Node.js applications. To get started with RabbitMQ in your project, install the `amqplib` library using npm and establish a connection to the RabbitMQ server.
Article explains inter-service communication in microservices, contrasting synchronous request/response (HTTP, gRPC) with asynchronous messaging/event-driven (queues, Kafka), outlining when to use each, trade-offs in latency, scalability, and complexity, and key concerns like error handling and service discovery, illustrated by a food-ordering workflow that mixes sync inventory checks with async kitchen and delivery events.
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