How Can I Rename JSON Field Names for Protobuf Extensions?

Renaming JSON Field Names for Protobuf Extensions

Many developers encounter the inconvenience of having JSON field names for Protobuf extensions prefixed with "[message.extension_message_name]". To resolve this, the protobuf/jsonpb module's default behavior of setting the JSONName with a prefix can be bypassed using the json_name field option.

In the Protobuf language guide, it is stated that field names for messages are mapped to lowerCamelCase and become JSON object keys. However, specifying the json_name field option allows developers to override this default behavior and use a custom key name.

For instance, the following Protobuf message:

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

will cause the myField field to have the name my_special_field_name when marshaled to JSON. This effectively overrides the default behavior of prefixing the extension message name.

Using this method, developers can customize the JSON field names for Protobuf extensions, eliminating unnecessary prefixes and enhancing the clarity and consistency of their JSON representations.

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