JavaScript to convert snake_case to camelCase (server-side)

toCamelCase.js

'use strict'

// converts snake_case to camelCase
// used to convert from database
// my_var => myVar
function toCamelCase (objectArrayOrString) {
  return keysToCamel(objectArrayOrString)
}

const toCamel = (s) => {
  // return name.replace(/_([a-z])/g, g => g[1].toUpperCase())
  return s.replace(/([-_][a-z])/ig, ($1) => {
    return $1.toUpperCase()
      .replace('-', '')
      .replace('_', '')
  })
}

const isArray = function (a) {
  return Array.isArray(a)
}

const isObject = function (o) {
  return o === Object(o) && !isArray(o) && typeof o !== 'function'
}

const keysToCamel = function (o) {
  if (isObject(o)) {
    const n = {}

    Object.keys(o)
      .forEach((k) => {
        n[toCamel(k)] = keysToCamel(o[k])
      })

    return n
  }
  else if (isArray(o)) {
    return o.map((i) => {
      return keysToCamel(i)
    })
  }

  return o
}

module.exports = toCamelCase