Example backend api client using axios

backend-api.service.ts

import { UserDTO } from '@shared/dto/user.dto';
import axios, { AxiosInstance } from 'axios';

class BackendClient {
    private instance: AxiosInstance;

    constructor() {
        this.instance = axios.create({
            baseURL: process.env.BACKEND_API_URL,
            headers: {
                Authorization: process.env.BACKEND_API_TOKEN,
            },
        });
    }
    
    // ...
    
    getUser = async (id: string): Promise<UserDTO> => {
        const { data } = await this.instance.get<UserDTO>('/user/' + id);
        return data;
    };
}