I'm using a class to convert xml to json for my project like so:

export class AccessionClass {
  constructor(accessionFilename) {
    this.accessionFilename = accessionFilename
    this.accessionXML = fs.readFileSync(this.accessionFilename).toString()
    const parser = new xml2js.Parser({ explicitArray: false })
    parser.parseString(this.accessionXML, (err, results) => {
      this.accessionJSON = results.accessions
    })...
  getJSONItem(itemNumber, callback) {
    let oneItem
    let items = this.accessionJSON.item.filter(item => {
      return item.accession === itemNumber
    })
    if (items.length > 1) {
      console.log('getJSONItem: ' + items.length + ' items for accession: ' + itemNumber)
    }
    callback(items[0])
  }

After calling getJSONItem the JSON string values have unconverted entities

(' & ...)

Am I missing an obvious option to do this? What is the best way to get these converted?