How to Convert a Go Struct to a Map Using JSON Tags as Keys?

Converting Struct to Map in Golang with JSON Keys

This question seeks a method to convert a Golang struct to a map, maintaining JSON tags as keys in the resulting map. Initially, the responses explored using the reflect package.

An alternative solution is provided by the structs package (https://github.com/fatih/structs) which offers comprehensive functions for working with structs:

• ConvertToMap: Converts a struct to a map
• ExtractFields: Obtains a slice of field names from a struct
• ExtractValues: Extracts a slice of field values from a struct
• IsStruct: Checks if a provided interface is a struct or a pointer to a struct
• IsInitialized: Verifies if a struct is initialized

The structs package supports anonymous fields and nested structs, and allows for filtering specific fields using field tags. For example:

type Server struct {
    Name    string  `json:"server_name"`
    ID      int32   `json:"server_id"`
    Enabled bool     `json:"is_enabled"`
}

s := &Server{
    Name:    "gopher",
    ID:      123456,
    Enabled: true,
}

// {"server_name": "gopher", "server_id": 123456, "is_enabled": true}
m := structs.Map(s)

In this example, the json tags are used as map keys, producing a JSON-compliant map representation of the struct. The structs package provides a versatile tool for managing structs and converting them to maps, addressing the original request effectively.

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