How to delete a part of from json file golang

Question

Suppose I have such a json file. I want to delete one of the window, image or text fields according to the user's choice and print the rest of the content to a different file.

  {
 "window": {
    "title": "Sample Konfabulator Widget",
    "name": "main_window",
    "width": 500,
    "height": 500
},
"image": { 
    "src": "Images/Sun.png",
    "name": "sun1",
    "hOffset": 250,
    "vOffset": 250,
    "alignment": "center"
},
"text": {
    "data": "Click Here",
    "size": 36,
    "style": "bold",
    "name": "text1",
    "hOffset": 250,
    "vOffset": 100,
    "alignment": "center",
    "onMouseUp": "sun1.opacity = (sun1.opacity / 100) * 90;"
}
}

For example, I want to delete the window field I want to write this content to a different file.

I'm stuck and have no idea how to do it. It is easy to write to another file, but I have no way of knowing how to delete a fiel

Can you suggest me some approaches that make sense?

   {
  "image": { 
    "src": "Images/Sun.png",
    "name": "sun1",
    "hOffset": 250,
    "vOffset": 250,
    "alignment": "center"
},
"text": {
    "data": "Click Here",
    "size": 36,
    "style": "bold",
    "name": "text1",
    "hOffset": 250,
    "vOffset": 100,
    "alignment": "center",
    "onMouseUp": "sun1.opacity = (sun1.opacity / 100) * 90;"
}
}

Manjeet Singh · Accepted Answer · 2022-12-11 16:40:18Z

1

As per my understanding, we can follow two approaches here. First We can Unmarshal JSON data into the Go language struct Second, we can UnmarshalJSON data into the Go language map because I don't know the struct so we can go with the map.

You can try the first approach also for learning purposes but that will only work with proper struct.

data := []byte(`{"window":{"title":"Sample Konfabulator Widget","name":"main_window","width":500,"height":500},"image":{"src":"Images/Sun.png","name":"sun1","hOffset":250,"vOffset":250,"alignment":"center"},"text":{"data":"Click Here","size":36,"style":"bold","name":"text1","hOffset":250,"vOffset":100,"alignment":"center","onMouseUp":"sun1.opacity = (sun1.opacity / 100) * 90;"}}`)

var v interface{}
err := json.Unmarshal(data, &v)
if err != nil {
    fmt.Println("error:", err)
}
m := v.(map[string]interface{})
// delete window
delete(m, "window")

then you can again marshal to JSON and write to file

b, err := json.Marshal(m)
if err != nil {
    fmt.Println("error:", err)
}
fmt.Println(string(b))

Go Playground

answered Dec 11, 2022 at 16:40

Manjeet Singh

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1 Comment

alangumanav Over a year ago

This is very useful, thank you very much. I was trying to create a struct and parse it to struct type. I didn't understand the interface you used. I think this interface data type replaces a struct. Anyway, I realized that I need to improve on the interfaces on go, thank you very much.

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