test.js

const {promisify} = require('util')
const rpj = promisify(require('read-package-json'))
const rpjf = require('read-package-json-fast')
const pj = require.resolve('./package.json')

Promise.all([
  rpj(pj),
  rpjf(pj),
]).then(console.log)

/*
[
  {
    name: 'foo',
    version: '1.2.3',
    directories: { bin: 'bin' },
    dependencies: {
      'read-package-json': '^3.0.1',
      'read-package-json-fast': '^2.0.2'
    },
    bin: { 'bar.js': 'bin/bar.js', 'foo.js': 'bin/foo.js' },
    readme: 'ERROR: No README data found!',
    _id: 'foo@1.2.3',
    [Symbol(newline)]: '\n',
    [Symbol(indent)]: '  '
  },
  {
    name: 'foo',
    version: '1.2.3',
    directories: { bin: 'bin' },
    dependencies: {
      'read-package-json': '^3.0.1',
      'read-package-json-fast': '^2.0.2'
    },
    _id: 'foo@1.2.3',
    [Symbol(newline)]: '\n',
    [Symbol(indent)]: '  '
  }
]
*/

$ \tree -I node_modules
.
├── bin
│   ├── bar.js
│   └── foo.js
├── package-lock.json
├── package.json
└── test.js