Golang compilation error: 'undefined: json.NewEncoder' How to solve it?

When writing code in Golang, you may encounter some compilation errors. One of the common errors is "undefined: json.NewEncoder". This error is usually caused by missing necessary packages or import errors.

In this article, we will introduce how to solve the "undefined: json.NewEncoder" compilation error.

First, we need to understand the role of the json.NewEncoder function. The json.NewEncoder function is a function in the Golang standard library that is used to encode data types into JSON format. When using this function, we need to import the "encoding/json" package.

If an "undefined: json.NewEncoder" error occurs during compilation, it is most likely because we did not import the "encoding/json" package correctly. We can import the package by adding the following code to the code file:

import "encoding/json"

If you have imported the package but still get compilation errors, it may be because the package was not downloaded or installed correctly. We can use the following command to download or update the "encoding/json" package:

go get encoding/json

Alternatively, we can use the following command to confirm whether the package has been installed correctly:

go list -f '{{.ImportPath}} {{.Error}}' encoding/json

If the command outputs " encoding/json 2d77b2345c34a631c3d251f57ce68620", it means that the package has been installed correctly.

If the error cannot be resolved, we may need to check if there are other errors in the code. For example, before using the json.NewEncoder function, we need to ensure that the data type to be encoded into JSON format is correct and meets the requirements of the json.Marshaler interface.

In short, when encountering "undefined: json.NewEncoder" compilation error, we need to check the imported package and ensure that it has been installed correctly. For other issues that may cause this error, we need to check if there are other errors in the code.

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