How Can I Customize JSON Names for Protobuf Extensions?

Customizing JSON Names for Protobuf Extensions

In a scenario where an extension message is added to a message, it's desirable to specify a custom JSON name for the extension message rather than the default format of [message.extension_message_name]. This article addresses this need and provides a workaround.

As mentioned in the problem, the JSON name for an extension message in Protobuf is automatically set as [desc.Name]. However, this naming convention may not be suitable in some cases, especially when the extension message is used elsewhere in the API and having the default name can lead to confusion.

To address this issue, the solution lies in using the json_name field option. According to the Protobuf language guide, message field names are converted to lower camel case and become JSON object keys. By specifying the json_name field option, you can override the default behavior and specify a custom JSON name.

For example, consider the following Protobuf definition:

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

With this definition, when the TestMessage is marshaled to JSON, the myField will appear as my_special_field_name in the JSON output,而不是默认的[TestMessage.myField].

This workaround allows developers to customize the JSON names for their extension messages, making them more aligned with their application's specific needs and reducing potential confusion.

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