Answer
CommonJS is Node’s module system using module.exports and require for import and export.
Quick Answer
CommonJS (CJS) is the original module system in Node.js — it uses require() to import and module.exports to export. It loads modules synchronously, which is fine for server-side code. It's still the default in most Node.js projects, though ES Modules (import/export) are now also supported.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ