Why add comments in Golang's JSON

In Golang, we often use JSON data format for data serialization and deserialization. JSON is a lightweight data exchange format that is widely used in different programming languages ​​and network protocols. Annotations play a very important role in processing JSON data, especially in large projects. Comments can help developers better understand code and data structures, and improve code readability and maintainability.

JSON does not natively support comments. This is because JSON is designed to stay simple and lightweight. However, in Golang, we can implement the functionality of JSON annotations through some tricks. Below we will introduce two implementation methods.

Method 1: Using Struct Tag

In Golang, we can use Struct Tag to define JSON serialization and deserialization rules. Structure tags are a special annotation syntax that allows us to add metadata to the fields of a structure. In JSON, we can use structure tags to add field description information and comments.

For example, suppose we have a structure named "Person":

type Person struct {

Name string `json:"name"` // 注释：姓名
Age  int    `json:"age"`  // 注释：年龄

}

We can Use comment syntax after the field to add comment information to the field. When we use the JSON serialization function, these annotation information will be ignored. However, when other developers read the code, they can understand the meaning of the data structure by reading these comments. For example:

{

"name": "Alice", // 姓名
"age": 23 // 年龄

}

Method 2: Use an empty field (Empty Field)

Another way to add comments is to use an empty field (Empty Field). In Golang, we can define an empty structure type and use its variables as field names in JSON. For example:

type CommentField struct{}

var Comment CommentField

type Person struct {

Name string `json:"name"` // 姓名
Age  int    `json:"age"`  // 年龄
// 这是一条注释
Comment CommentField `json:"-"` // 注释：个人信息

}

In the above code , we defined an empty structure type CommentField and created a variable named Comment. We use the Comment variable as a field of the structure type Person, but during the JSON serialization and deserialization process, we use the mark "-" to ignore this field and do not convert it. This effectively uses the Comment variable as a comment and does not affect the serialization and deserialization of data.

Conclusion

Through the above two methods, we can add annotation information in Golang's JSON to improve the readability and maintainability of the code. As with other skills in software development, adding comments requires attention to appropriate degree and usage. Comments should be clear and concise and should not be repetitive or meaningless. Adding comments to JSON during development will help us better process and understand the data structure.

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