How to Dynamically Select and Remove JSON Fields in Go?

Removing or Hiding Fields in JSON Response with Dynamic Selection

The problem involves an API that generates a struct-based JSON response. The challenge is to dynamically select which fields to return based on a "fields" query parameter. Unfortunately, removing fields from a struct is not feasible, and hiding them with the json:"omitempty" tag won't suffice when empty values are present.

Alternative Solution: Using a Map

To address this, consider using a map[string]interface{} instead of a struct. This allows for dynamic field selection and removal:

type SearchResultsMap map[string]interface{}

// Populate the map with data
searchResultsMap := make(SearchResultsMap)
searchResultsMap["Date"] = "2023-03-08"
searchResultsMap["Company"] = "Acme Corp"
searchResultsMap["Country"] = "USA"

// Remove unwanted fields
delete(searchResultsMap, "IdCompany")
delete(searchResultsMap, "Industry")

// Encode and output the response
err := json.NewEncoder(c.ResponseWriter).Encode(&searchResultsMap)

By using a map, you gain the flexibility to selectively include or exclude fields based on the specified query parameters. Additionally, you can easily manipulate the map to meet your dynamic field selection requirements.

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