https://nalar.dev/tags/node.js/ Recent content in Node.js on Nalar Hugo en-us Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/nodejs-mjs-cjs-js-module-formats/ Sat, 19 Sep 2026 00:00:00 +0000 https://nalar.dev/nodejs-mjs-cjs-js-module-formats/ <p>Node.js can execute JavaScript through two module systems: ECMAScript modules (ESM) and CommonJS. The filename is one of the signals that selects between them, which is why files such as <code>postcss.config.mjs</code> appear in projects even when most source files still end in <code>.js</code>.</p> <p>The important detail is that <code>.mjs</code> is not a different JavaScript language. It is an explicit instruction to Node.js: parse and load this file as an ES module.</p>