How to handle errors from API requests in Vue?
To handle API errors in Vue, you must first distinguish the error types and handle them uniformly to improve the user experience. The specific methods are as follows: 1. Distinguish the error types, such as network disconnection, non-2xx status code, request timeout, business logic error, etc., and make different responses through judgment error.response in the request; 2. Use the axios interceptor to realize a unified error handling mechanism, and perform corresponding operations according to the status code in the response interceptor, such as 401 jump to login page, 404 prompts the resource does not exist, etc.; 3. Pay attention to user experience, feedback errors through Toast prompts, error banners, retry buttons, etc., and close the loading status in a timely manner. These methods can effectively improve the robustness and user-friendliness of the application.
It is actually not difficult to handle errors in API requests in Vue. The key is to cover various situations and give users clear feedback. If you simply catch the error, it may not be enough.
Here are some practical practices that can help you better deal with API request errors.
The error types need to be clearly distinguished
There are many reasons for API request errors, common ones include:
- The network is disconnected (such as the user does not have the Internet)
- The interface returns a non-2xx status code (such as 404, 500)
- Request timeout
- The backend returns error information on business logic (such as token failure or parameter error)
In Vue project, if you use axios or fetch , the manifestations of these errors are different. For example, network errors will enter .catch() , while errors such as 404 will be brought out in the response.
So the first step is to determine the type of error:
axios.get('/some-api')
.catch(error => {
if (!error.response) {
// Network problem or request is not sent out at all} else if (error.response.status >= 400) {
// The interface returns the specific error status code}
});In this way, you can make different processing according to different situations, such as prompting "network exception" or "data loading failed".
Unified error handling mechanism is easier
If you write error handling separately for each interface, the code will quickly become bloated. It is recommended to uniformly intercept errors on axios instance.
For example, you can add a response interceptor:
axios.interceptors.response.use(
response => response,
error => {
if (error.response) {
switch (error.response.status) {
case 401:
// Token expires, jump to the login page break;
case 404:
// Prompt that the resource does not exist;
default:
// Other errors are unified}
} else {
// Network error}
return Promise.reject(error);
}
);After doing this, you can only focus on the successful branches of business logic in the component and leave the errors to a unified place to handle.
User experience is also important
It is not enough to just print an error on the console, the user needs to know what is going on. Common practices include:
- Pop up the Toast prompt
- Show error banner at the top of the page
- For certain specific interfaces, the retry button can be displayed
For example, if you are making a list page, if the first request fails, in addition to the prompt, you can also ask the user to click "Retry" to initiate the request again. This is much better than just hang up.
In addition, don't forget to turn off the loading status, otherwise the user will think it is loading all the time.
Basically that's it. API error handling seems simple, but if you don’t take into account various boundary situations carefully, it is easy to miss some user experience points. Especially for problems such as network instability and inconsistent backend return formats, you need to prepare in advance.
The above is the detailed content of How to handle errors from API requests in Vue?. For more information, please follow other related articles on the PHP Chinese website!
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