How to Unmarshal JSON with Unknown Field Names into a Go Struct?-Golang-php.cn

How to Unmarshal JSON with Unknown Field Names into a Go Struct?

Susan Sarandon

Release： 2024-12-17 11:45:25

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How to Unmarshal JSON with Unknown Field Names into a Go Struct?

Unmarshaling JSON with Unknown Fieldnames to a Struct

This scenario arises when the JSON response contains fields with unknown or dynamic names. To address this, we can utilize a combination of a map and a struct to capture the data.

Modified Code:

package main

import "fmt"
import "encoding/json"

var body = []byte(`{
    "unknown_field": {
            "known_field_1": [[1,2,3,4,5],[10,20,30,40,50],[100,200,300,400,500]],
            "known_field_2": [[11,21,31,41,51]],
            "known_field_3": [[12,22,32,42,52],[14,44,34,44,54]]
        }
}`)

type mData struct {
    KnownField1 [][5]int `json:"known_field_1"`
    KnownField2 [][5]int `json:"known_field_2"`
    KnownField3 [][5]int `json:"known_field_3"`
}

var data map[string]mData

func main() {
    if err := json.Unmarshal(body, &data); err != nil {
        panic(err)
    }

    fmt.Println(data)
    for k, v := range data {
        fmt.Println(k, v)
    }
}

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Explanation:

We define a mData struct to represent the known fields in the JSON.
We create a map data, where the keys are the unknown fieldnames and the values are instances of mData.
During unmarshalling, json.Unmarshal assigns the JSON data to the corresponding fields in mData based on the field names.
The keys of the data map are the dynamic fieldnames from the JSON.

Output:

map[unknown_field:{[[1 2 3 4 5] [10 20 30 40 50] [100 200 300 400 500]] [[11 21 31 41 51]] [[12 22 32 42 52] [14 44 34 44 54]]}]
unknown_field {[[1 2 3 4 5] [10 20 30 40 50] [100 200 300 400 500]] [[11 21 31 41 51]] [[12 22 32 42 52] [14 44 34 44 54]]}

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