All 15 Core Node.js Modules questions
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What does the node:path module provide, and why should you always use it instead of manually concatenating file path strings?

Intermediate

Answer

The path module provides platform-aware utilities -- join(), resolve(), dirname(), extname() -- that correctly handle the difference between path separators on different OSes, whereas manual string concatenation with a hardcoded '/' would break on Windows.
const filePath = path.join(__dirname, 'data', 'users.json');
console.log(path.extname(filePath));
Real-world example A CLI tool that manually concatenated paths worked on macOS but broke on Windows until every path operation was replaced with path.join(), which uses the correct separator per OS.

Common follow-ups: What's the difference between path.join() and path.resolve() regarding relative versus absolute output?;How does path.normalize() clean up redundant segments like '../'?

File System (fs) Module;CLI Tools & Scripting with Node.js
All 15 Core Node.js Modules questions