client/src/lib/api.js

import axios from "axios";
import { STORAGE_KEYS } from "./storage";

export const api = axios.create({
  baseURL: "/api"
});

api.interceptors.request.use((config) => {
  const token = localStorage.getItem(STORAGE_KEYS.token);
  if (token) {
    config.headers.Authorization = `Bearer ${token}`;
  }
  return config;
});