Vue is a popular front-end framework. Various errors and problems are often encountered when developing applications. Among them, Uncaught (in promise) TypeError is a common error type. In this article, we will discuss its causes and solutions.

1. What is Uncaught (in promise) TypeError?
   Uncaught (in promise) TypeError errors usually occur when using asynchronous requests. The Promise object calls non-existent methods or properties, resulting in TypeError errors. This error message means that the catch function of a Promise object did not catch the error message, but threw an uncaught exception.
2. What are the reasons for this error?
   Usually, the reasons for the Uncaught (in promise) TypeError error are as follows:

2.1. An undefined method or property is called on a Promise object, resulting in a TypeError error.

2.2. Errors are not handled correctly in the Promise object, resulting in error information not being captured.

2.3. The Promise object returned an object of non-Promise type, and an error occurred during processing.

3. How to avoid Uncaught (in promise) TypeError?
   In order to avoid Uncaught (in promise) TypeError errors in Vue applications, you can take the following measures:

3.1. When processing callback functions asynchronously, use try-catch blocks to catch exceptions and Handle errors.

You can use the following code as an example:
async function getUserInfo(){

  try{
      let result = await axios.get('http://localhost:3000/getUserInfo')
      console.log(result)
  }catch(error){
      console.log(error)
  }

}

3.2. When processing Promise objects, ensure that all unstable Promise objects are all handled correctly. An unstable Promise object refers to a Promise object that may encounter errors during processing. This type of Promise object requires error handling.

3.3. When using asynchronous requests, ensure that all Promise objects run normally, use the async and await keywords correctly, and ensure that exceptions are caught and errors handled in asynchronous requests.

4. How to solve Uncaught (in promise) TypeError?
   If an Uncaught (in promise) TypeError error has occurred, you can take the following measures to solve the problem:

4.1. Use the debugging tools provided by the browser to view the error information in the console, and Find the line of code where the error occurred.

4.2. In the line of code where the error occurs, check whether the code is correct. If a code error is found, the code needs to be modified.

4.3. Track and process uncaught error information. If the error information comes from back-end data, back-end personnel need to provide corresponding solutions.

5. Summary
   Although the Uncaught (in promise) TypeError failure is one of the common problems encountered in Vue development, this problem can be avoided or solved by taking some simple measures. When using asynchronous requests, be sure to ensure that all Promise objects are functioning properly, and ensure that exceptions are caught and errors handled in asynchronous requests, so that Uncaught (in promise) TypeError errors can be better handled.

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