batch rename files in some directory

rename.js

const fs = require('fs')

const DIR = 'this is the directory you want to process'
const STRING_TO_REMOVE_IN_FILENAME = 'this is the string in file name which you want to replace'
const NEW_STRING = 'this is the string you want to replace with'

rename_file_in_dir({dir: DIR, str: STRING_TO_REMOVE_IN_FILENAME, newstr: NEW_STRING})

function rename_file_in_dir ({dir, str, newstr}) {
  // const files = fs.readdirSync(dir, {withFileTypes: true}).map(file => ({name: file.name, is_dir: file.isDirectory()}))
  // for lower version of node which not support 'withFileTypes'
  const files = fs.readdirSync(dir).map(name => ({name, is_dir: fs.statSync(`${dir}/${name}`).isDirectory()}))
  files.forEach(file => {
    const {name, is_dir} = file
    if (is_dir) return rename_file_in_dir({dir: `${dir}/${name}`, str, newstr})
    let new_name = name.replace(str, newstr)
    if (new_name === name) return
    if (!name.startsWith('.') && new_name.startsWith('.')) new_name = Date.now() + new_name
    const old_path = `${dir}/${name}`
    const new_path = `${dir}/${new_name}`
    // return console.log('rename', old_path, 'to', new_path) // you might want to see the files that will be renamed first
    fs.rename(old_path, new_path, err => {
      err ? console.error(err) : console.log('rename', old_path, 'to', new_path)
    })
  })
}