Gin Cannot validate struct even with dive

I have struct like below:

type TextMessage struct {
    Contacts []struct {
        Profile struct {
            Name string `json:"name"`
        } `json:"profile"`
        WaID string `json:"wa_id"`
    } `json:"contacts" binding:"required,dive"`
    Messages []struct {
        From      string `json:"from"`
        ID        string `json:"id"`
        Timestamp string `json:"timestamp"`
        Text      struct {
            Body string `json:"body"`
        } `json:"text"`
        Type string `json:"type"`
    } `json:"messages" binding:"required,dive"`
}

However incoming Message have no text json tag, but validation is passed and no any error I saw:

var textMessage TextMessage
err = c.ShouldBindBodyWith(&textMessage, binding.JSON)
//answer: err is nil 

Comment From: Tseian

Inside Gin using encoding/json to decode body, like below.

package main

import (
    "encoding/json"
    "fmt"
    "strings"
)

type Person struct {
    Name string `json:"name"`
    Age  int    `json:"age"`
}

func main() {
    textMessage := `{}`
    decoder := json.NewDecoder(strings.NewReader(textMessage))
    var p Person
    if err := decoder.Decode(&p); err != nil {
        panic(err)
    }
    fmt.Printf("Name: %s, Age: %d\n", p.Name, p.Age)
       // Name: , Age: 0
}

deocder.Decode works even if the textMessage is '{}'. Maybe you should be more patient to check the http body.

Comment From: sabuhigr

It only works like that: https://go.dev/play/p/63gZN3SMKlC (can replace validator with binding tag)