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encoding/json: Wrong marshal output on embeded structure with the custom marshaller #10939

fzerorubigd opened this issue May 23, 2015 · 1 comment


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commented May 23, 2015

Having an embeded struct with custom marshalJSON function, make the json.Marshal to use that marshal function in the base structure.

package main

import (

type h0 struct {
    M []string

func (a h0) MarshalJSON() ([]byte, error) {
    return json.Marshal(a.M)

type h1 struct {
    h0 `json:"hedaer"`
    A string
    B string

func main() {

    v := h1{}
    v.A = "A" 
    v.B = "B"
    v.M = append(v.M, "1", "2", "3")

    a, err := json.Marshal(v)
    if err != nil {


Output must be :


But is :


in playground :

the reason is obvious, since the function invoked on the outer structure, but I think json library must ignore this kind of marshaller functions.
I test this against the latest version of go (1.4.2) in linux, and also the git version of go .
Any other information is required?

@minux minux closed this May 23, 2015


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commented May 23, 2015

@golang golang locked and limited conversation to collaborators Jun 25, 2016

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