In Node.js, most scripts and applications require access to the files stored on the disk of the machine they run on.

Common use cases include, reading from configuration files, processing and converting data files (e.g., JSON, CSV), generating execution logs, creating automated backups, and more.

The two most important core modules for working with files in Node.js are the path and the fs modules.

The path module

The path module is a core module that provides utilities for working with filepaths in a convenient way.

const path = require('node:path');

Joining path segments

To join multiple path segments separated by a forward slash character / into a single normalized filepath string, you can use the path.join() static method:

let filepath = path.join(chunk, ...);

Where:

• filepath is the full path string composed of all the specified chunks.

• chunk, ... is a list of comma-separated strings representing filepath chunks.