Function readJSON

code/ch14/promise/readJSON.js:2–15

(filename, enc='utf8')

const fs = require('fs')
function readJSON(filename, enc='utf8'){
  return new Promise(function (resolve, reject){
    fs.readFile(filename, enc, function (err, res){
      if (err) reject(err);
      else {
        try {
          resolve(JSON.parse(res))
        } catch (ex) {
          reject(ex)
        }
      }
    })
  })
}

readJSON('./package.json').then(console.log)