An example of how one could mimic axios' API over standard Fetch.

fake-axios.js

const axios = {

  commons: {
    headers: {}
  },

  async _fetchWithCommons(url, options) {
    const response = await fetch(url, {
      ...this.commons,
      ...options
    })
    const data = await response.json()

    return {
      ...response,
      data
    }
  },

  get(url, options) {
    return this._fetchWithCommons(url, {
      method: 'get',
      ...options
    })
  },

  post(url, data, options) {
    return this._fetchWithCommons(url, {
      method: 'post',
      body: JSON.stringify(data),
      ...options
    })
  }

}

// Usage

axios.commons.headers['Authorization'] = `Bearer ${token}`

const { data } = await axios.post('/contacts', {
  name: 'Alessandro',
  surname: 'Menduni'
})