how to set json tag with a variable in golang?

Question

is there a way to set field tag of a struct ? for example :

type contact struct {
    Mail string `json:"contact"`
}

newStruct := setTag(temp, "Mail", "mail")

data, _ := json.Marshaller(qwe)
fmt.Println(data)

and it accepts this payload:

{
    "mail": "blabla"
}

Possible duplicate of What is the correct JSON content type? — CallMeLoki
– CallMeLoki, Commented Dec 11, 2016 at 17:02

Aruna Herath · Accepted Answer · 2016-04-01 22:43:37Z

5

Looks like you want your key of the json to be a variable. You can do this by using the map data type.

package main

import "fmt"
import "encoding/json"

func main() {
    asd := "mail"
    qwe := make(map[string]string)

    qwe[asd] = "jack"

    data, _ := json.Marshal(qwe)
    fmt.Println(string(data))  // Prints "{mail: jack}"
}

playground

edited Apr 1, 2016 at 22:43

answered Apr 1, 2016 at 22:37

Aruna Herath

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Comments

Community · Accepted Answer · 2020-06-20 09:12:55Z

0

You have to export the key. Working example

From godoc for package json.Marshal,

Struct values encode as JSON objects. Each exported struct field becomes a member of the object unless

the field's tag is "-", or

the field is empty and its tag specifies the "omitempty" option.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Apr 2, 2016 at 5:01

Fallen

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