如何更改golang标签的默认操作？

I am not familiar with usage of golang tags, I want to change the default action of convertion:

type CvJdRelationInfo struct {
    JdId            string
    CvId            string
    Status          int16
    AcceptTimestamp int64
}

json tag will auto convert:

JdId -> JdId
CvId -> CvId
Status -> Status
AcceptTimestamp -> AcceptTimestamp

bson tag will auto convert:

JdId -> jdid
CvId -> cvid
Status -> status
AcceptTimestamp -> accepttimestamp

Can I change the default action, such as json bson tags will do this:

JdId -> jdId
CvId -> cvId
Status -> status
AcceptTimestamp -> acceptTimeStamp

So I can omission all tags each time(why should I write tags each time if default action is just what I want?)

type CvJdRelationInfo struct {
    JdId            string `json:"jdId" bson:"jdId"`
    CvId            string `json:"cvId" bson:"cvId"`
    Status          int16  `json:"status" bson:"status"`
    AcceptTimestamp int64  `json:"acceptTimestamp" bson:"acceptTimestamp"`
}

You can try:

   type CvJdRelationInfo struct {
     JdId            string    `bson:"jdId" json:"jdId"`
     CvId            string    `bson:"cvId" json:"cvId"`
     Status          int16     `bson:"status" json"status"`
     AcceptTimestamp int64     `bson:"acceptTimeStamp" json:"acceptTimeStamp"`
   }

You can't change the default behavior of the encoding/json package. It's built into it and there is no exported variable or function which would change it. Nothing to discuss on it.

The object's default key string is the struct field name but can be specified in the struct field's tag value.

One thing to note here is that even though marshaling a value to JSON will use the exported, uppercased name, but when you unmarshal, the json package is "intelligent" enough to match lowercased names to uppercased field names too.

See this example:

s := struct{ X, Y int }{}
if err := json.Unmarshal([]byte(`{"X":1,"y":2}`), &s); err != nil {
    panic(err)
}
fmt.Printf("%+v", s)

It will print (Go Playground):

{X:1 Y:2}

The json package properly matches the "X" and "y" keys to the s.X and s.Y fields even though "y" is written lowercased.