How to Unmarshal Nested JSON with Unknown Keys and Variable Structure?

Unmarshalling Nested JSON with Unknown Keys and Variable Structure

In the provided JSON, the keys for the nested objects representing different server details (e.g., "Server1.example.com," "Server2.example.com") are unknown and can vary. Additionally, the nested object structure contains a peculiar field ("name") without an explicit key.

To effectively unmarshal this JSON data, we need an approach that can dynamically handle unknown keys and variable object structure.

One viable solution is to utilize a map[string]ServerDetails structure. This allows us to store key-value pairs where the keys correspond to the server names (e.g., "Server1.example.com," "Server2.example.com"). Each value in the map would be a ServerDetails struct containing the server-specific details.

The revised structure would look something like this:

type YourStruct struct {
    Success bool
    ResponseMS int
    Servers map[string]*ServerDetails
}

type ServerDetails struct {
    Application string
    Owner string
    [...]
}

To unmarshal the JSON data, the following steps can be taken:

1. Unmarshal the JSON into a temporary map[string]interface{} structure. This will preserve the unknown keys and variable object structure.
2. Iterate through the temporary map and create a new ServerDetails struct for each unknown key (server name).
3. Unmarshal the nested JSON for each server into the respective ServerDetails struct using additional JSON tags as needed.
4. Assign the populated ServerDetails structs to the Servers map in the final YourStruct.

By adopting this approach, we can successfully unmarshal the JSON data into a structured format, even with unknown keys and variable object structure.

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