**Summary of Axios - A Powerful HTTP Client for JavaScript** Axios is a popular JavaScript library used for making HTTP requests from the browser or Node.js applications. It provides an easy-to-use and flexible interface to interact with APIs and fetch data. As a software developer, understanding Axios is essential for building modern web applications that communicate with backend servers. **1. Installation and Setup:** To use Axios in your project, you need to install it first. You can do this using npm or yarn. Example: ```bash npm install axios ``` or ```bash yarn add axios ``` **2. Making GET Requests:** Axios makes it simple to send GET requests to a server and handle the responses. Example: ```javascript axios.get('https://api.example.com/data') .then(response => { console.log(response.data); }) .catch(error => { console.error('Error fetching data:', error); }); ``` **3. Making POST Requests:** You can use Axios to send data to the server using POST requests. Example: ```javascript const data = { name: 'John', email: 'john@example.com' }; axios.post('https://api.example.com/users', data) .then(response => { console.log('User created:', response.data); }) .catch(error => { console.error('Error creating user:', error); }); ``` **4. Handling Errors:** Axios allows you to handle different types of errors that might occur during the HTTP request. Example: ```javascript axios.get('https://api.example.com/data') .then(response => { console.log(response.data); }) .catch(error => { if (error.response) { // The server responded with a status code other than 2xx. console.error('Request failed with status:', error.response.status); } else if (error.request) { // The request was made but no response was received. console.error('No response received:', error.request); } else { // Something happened in setting up the request that triggered an error. console.error('Error:', error.message); } }); ``` **5. Setting Headers:** You can set custom headers in your requests, such as authorization tokens or content types. Example: ```javascript const headers = { Authorization: 'Bearer YOUR_ACCESS_TOKEN', 'Content-Type': 'application/json', }; axios.post('https://api.example.com/data', data, { headers }) .then(response => { console.log(response.data); }) .catch(error => { console.error('Error:', error.message); }); ``` **6. Performing Concurrent Requests:** Axios allows you to perform multiple requests concurrently using `axios.all` and `axios.spread`. Example: ```javascript const request1 = axios.get('https://api.example.com/data/1'); const request2 = axios.get('https://api.example.com/data/2'); axios.all([request1, request2]) .then(axios.spread((response1, response2) => { console.log('Response 1:', response1.data); console.log('Response 2:', response2.data); })) .catch(error => { console.error('Error:', error.message); }); ``` **7. Interceptors:** You can use Axios interceptors to transform request and response data globally. Example: ```javascript axios.interceptors.request.use(config => { // Modify the config before the request is sent. config.headers['X-Requested-With'] = 'XMLHttpRequest'; return config; }); axios.interceptors.response.use(response => { // Modify the response data before it is resolved. return response.data; }); ``` **8. Cancellation:** Axios supports request cancellation to abort ongoing requests. Example: ```javascript const source = axios.CancelToken.source(); axios.get('https://api.example.com/data', { cancelToken: source.token }) .then(response => { console.log(response.data); }) .catch(error => { if (axios.isCancel(error)) { console.log('Request canceled:', error.message); } else { console.error('Error:', error.message); } }); // Cancel the request (e.g., on component unmount). source.cancel('Request canceled due to component unmount.'); ``` **Cheatsheet:** Here's a quick cheatsheet summarizing the most important concepts and commands in Axios: ```plaintext 1. Installation and Setup: npm install axios 2. Making GET Requests: axios.get(url[, config]) 3. Making POST Requests: axios.post(url[, data[, config]]) 4. Handling Errors: axios.get(url).then().catch() 5. Setting Headers: const headers = { key: 'value' }; axios.post(url, data, { headers }) 6. Performing Concurrent Requests: axios.all([request1, request2]).then(axios.spread()) 7. Interceptors: axios.interceptors.request.use() axios.interceptors.response.use() 8. Cancellation: const source = axios.CancelToken.source(); axios.get(url, { cancelToken: source.token }); source.cancel('Reason for cancellation'); ``` With this summary and cheatsheet, you have all the essential information to confidently use Axios for handling HTTP requests in your software development projects. Happy coding!
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