How Can I Define Multiple Name Tags for a Struct Field in Go?

Defining Multiple Name Tags in a Struct

As you've encountered, you may need to define multiple name tags for a struct field to accommodate different serialization formats, such as BSON and JSON. The provided example demonstrates the need to encode a struct to JSON while maintaining lowercase field names, despite the BSON field names being uppercase.

The solution to this problem is to separate tag string separators with spaces instead of commas. The following modification to your code will resolve the issue:

type Page struct {
    PageId string                 `bson:"pageId" json:"pageId"`
    Meta   map[string]interface{} `bson:"meta" json:"meta"`
}

As per the documentation of the reflect package, tag strings are a concatenation of "key:'value'" pairs separated by spaces. Each key is a non-empty string that must not contain control characters, spaces, quotes, or colons. Each value is enclosed in double quotes and follows Go string literal syntax.

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