Axios: Interceptor'lar ve Temel URL

Axios Neden Kullanılır?

Axios'u Kurma

npm install axios

Temel GET ve POST

import axios from 'axios';

const { data } = await axios.get('/api/users');
console.log(data); // already parsed

const res = await axios.post('/api/users', { name: 'Alice' });
console.log(res.data, res.status);

Axios Örneği Oluşturma

import axios from 'axios';

export const api = axios.create({
  baseURL: import.meta.env.VITE_API_URL,
  timeout: 10000,
  headers: { 'Content-Type': 'application/json' }
});

// Use it:
const { data } = await api.get('/users');
const res = await api.post('/users', { name: 'Alice' });

İstek Araya Giricisi: Kimlik Doğrulama Token'ı

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

Yanıt Araya Giricisi: Genel Hatalar

api.interceptors.response.use(
  (response) => response,
  (error) => {
    if (error.response?.status === 401) {
      window.location.href = '/login';
    }
    if (error.response?.status >= 500) {
      toast.error('Server error. Please try again.');
    }
    return Promise.reject(error);
  }
);

401 Durumunda Token Yenileme

api.interceptors.response.use(null, async (error) => {
  const originalRequest = error.config;
  if (error.response?.status === 401 && !originalRequest._retry) {
    originalRequest._retry = true;
    const newToken = await refreshToken();
    localStorage.setItem('token', newToken);
    originalRequest.headers.Authorization = `Bearer ${newToken}`;
    return api(originalRequest); // retry
  }
  return Promise.reject(error);
});

URL Parametreleri ve Sorgu

const { data } = await api.get('/search', {
  params: { q: 'react hooks', page: 2 }
});
// GET /search?q=react+hooks&page=2

Zaman Aşımları

api.get('/slow-endpoint', { timeout: 5000 })
  .catch(err => {
    if (err.code === 'ECONNABORTED') {
      console.log('Request took too long');
    }
  });

İstekleri İptal Etme

const controller = new AbortController();

api.get('/big-data', { signal: controller.signal })
  .catch(err => {
    if (axios.isCancel(err)) console.log('cancelled');
  });

controller.abort();

Hata Nesnesinin Yapısı

Axios ve Fetch — Ne Zaman Hangisini Seçmeli

Hızlı Kontrol

Özet: Axios