Custom API wrapper (minimalistic concept) for any RESTful API to minimize and beautify your code

api-wrapper.js

class WhateverAPI {
  constructor(baseUrl, clientID, accessToken) {
    this._baseUrl = baseUrl;
    this._clientID = clientID;
    this._accessToken = accessToken;
    this._baseUrl += this._baseUrl.slice(-1) !== '/' ? '/' : '';
  }

  resolveUrl(path) {
    return this._baseUrl + path + `?client_id=${this._clientID}&access_token=${this._accessToken}`;
  }

  get(path) {
    return fetch(this.resolveUrl(path)).then(response => response.json());
  }

  post(path, data) {
    return fetch(this.resolveUrl(path), {
      method: 'POST',
      body: JSON.stringify(data)
    }).then(response => response.json());
  }
  
  ...
}

const myContactBook = new WhateverAPI('https://googleapi.com/contactbook', 'xxx', 'yyy');
myContactBook.get('contacts');
myContactBook.post('contacts', { name: 'Max Diachenko', age: 26 });