Golang compilation error: "undefined: json.NewDecoder" How to solve it?

In recent years, the Golang language has received more and more attention and application. However, like other programming languages, Golang will also encounter some problems during use. One of the problems is the compilation error: "undefined: json.NewDecoder".

This error is generally caused by the lack of Golang's built-in standard library. There are several ways to solve this error:

1. Check the version

First, you need to check whether your Golang version is older. This problem generally occurs when the Golang version is older. If this problem is caused, you need to upgrade your Golang version. You can find the download address of a higher version on the Golang official website. After downloading and installing, compile your code again and the error should be resolved.

2. Import packages

If the problem is not solved after upgrading the Golang version, you need to check whether your code correctly imports the required packages. This error is caused by the json package not being imported. Therefore, you need to add the following code at the beginning of the code:

import (
    "encoding/json"
)

This will ensure that the json package is successfully imported so that your code can call the functions in it.

3. Reinstall

If neither of the above two methods works, you need to reinstall Golang. You need to completely uninstall Golang from your computer and re-download and install it.

Summary

During the development process using Golang, compilation error: "undefined: json.NewDecoder" is a common problem that you may encounter. This error is usually caused by an old version of Golang or a lack of import of the corresponding package. The solution to the problem can be to upgrade the Golang version, import the required packages or reinstall Golang. If you still can't solve it, you can seek help from the Golang community.

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