How to Flatten Nested JSON in Go?

Flattening Nested JSON

You have a nested JSON response and want to flatten it to a single level, eliminating the nested Facebook type. To achieve this, you can utilize a custom UnmarshalJSON function. However, a simpler and more flexible solution is to use a flattening function.

Custom Flattening Function

<code class="go">// Flatten takes a map and returns a new one where nested maps are replaced
// by dot-delimited keys.
func Flatten(m map[string]interface{}) map[string]interface{} {
    o := make(map[string]interface{})
    for k, v := range m {
        switch child := v.(type) {
        case map[string]interface{}:
            nm := Flatten(child)
            for nk, nv := range nm {
                o[k+"."+nk] = nv
            }
        default:
            o[k] = v
        }
    }
    return o
}</code>

Using the Flattening Function

In your Go code:

<code class="go">var jsonBlob = []byte(`[
    {"StumbleUpon":0,"Reddit":0,"Facebook":{"commentsbox_count":4691,"click_count":0,"total_count":298686,"comment_count":38955,"like_count":82902,"share_count":176829},"Delicious":0,"GooglePlusOne":275234,"Buzz":0,"Twitter":7346788,"Diggs":0,"Pinterest":40982,"LinkedIn":0}
]`)

var social []Social
err := json.Unmarshal(jsonBlob, &amp;social)
if err != nil {
    fmt.Println("error:", err)
}

for _, s := range social {
    socialMap := Flatten(s)
    fmt.Printf("%+v\n", socialMap)
}</code>

Example Output

With the flattened Social map, you will get:

map[StumbleUpon:0 Reddit:0 Facebook.commentsbox_count:4691 Facebook.click_count:0 Facebook.total_count:298686 Delicious:0 GooglePlusOne:275234 Buzz:0 LinkedIn:0 Facebook.comment_count:38955 Facebook.like_count:82902 Facebook.share_count:176829 Twitter:7346788 Diggs:0 Pinterest:40982]

This output shows the flattened Social map with all the Facebook fields accessible as `Facebook....

This approach provides a generic way to flatten JSON responses, eliminating the need for nested types.

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