How to Convert a Go Struct to a Map Using JSON Tags as Keys?
Dec 09, 2024 pm 08:54 PMConverting 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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