In Go, what is the purpose of the json:"fieldname" tag in struct fields?
- Adds metadata for JSON encoding and decoding
- Defines the field's default value
- Indicates the field's visibility
- Specifies the field type
The json:"fieldname" tag in Go struct fields is used to provide metadata for JSON encoding and decoding. It allows developers to specify the JSON field name corresponding to the struct field. This is particularly useful when the JSON representation needs to differ from the Go struct's field names. For example, you can use it to control the JSON key naming conventions or to map struct fields to specific JSON fields.
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