server.js

const config = {
        url: 'https://book-store-adonis.herokuapp.com/api',
        actions: {
            get:{
                method: 'GET',
                path: '/book/:id'
            }
        }
}

class Server {
    constructor(config) {
        this.config = config
    }
  
    get(id) {
        return axios({
            method: this.config.actions['get'].method,
            url: this.config.url.concat(this.config.actions['get'].path).replace(':id',id),
          });
    }
}