How Can I Customize JSON Field Names for Protobuf Extension Messages?

Customizing JSON Names for Protobuf Extension Messages

Problem:
When extending a message and marshaling it as JSON, the field name for the extension message defaults to "[message.extension_message_name]". This can be undesirable, as it introduces unnecessary complexity and confusion.

Solution:
To customize the JSON name for a protobuf extension message, utilize the json_name field option. By specifying the desired name within the square brackets, you can override the default behavior. For instance:

message TestMessage {
    string myField = 1 [json_name="my_special_field_name"];
}

Upon marshaling TestMessage to JSON, the field myField will now appear with the name my_special_field_name. This aligns with the language guide's recommendation to use json_name for customizing JSON keys for message fields.

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