Node.js is a runtime system that makes it easy to build a network or other event-driven application servers. Here are the six things you need to know about it:
1. JSON has won
JSON (JavaScript Object Notation) is a practical, compound, wildly popular data exchange format. JSON has enabled JavaScript developers to quickly construct APIs and foster interoperability at scale -- a key objective for Node.js coders. JSON's stark simplicity can be expressed in just five railroad parse diagrams, notably without the self-conscious preening of XML and its scheming friends (SOAP, XSD, WS-*, RELAX-NG, and their endless committee meetings).
JSON and JavaScript have reinforced each other's importance. Back in the early days of the Web, dynamic data in the browser had to be manipulated, filtered, and operated on by the only reasonably comprehensible non-plugin language available: JavaScript. Regardless of its original network-presentable format, data needed to be marshalled into a JavaScript object. The dependence on JSON for general purpose data description gave rise to document-oriented NoSQL databases such as MongoDB and CouchDB. It's all JSON all the time today.
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