test.js

// Require `PhoneNumberFormat`.
const PNF = require('google-libphonenumber').PhoneNumberFormat;

// Get an instance of `PhoneNumberUtil`.
const phoneUtil = require('google-libphonenumber').PhoneNumberUtil.getInstance();

function test(text) {
  // Parse number with country code and keep raw input.
  let number = phoneUtil.parseAndKeepRawInput(text, 'JP');
  
  console.log(phoneUtil.formatInOriginalFormat(number, 'JP'));
  // Format number in the national format.
  console.log(phoneUtil.format(number, PNF.NATIONAL));
}

test('0867250000')
test('0863670000')