Hi Feng,
As far I know, protobuf wire format does not have much of an advantage
over JSON format on web apps because the payload is usually small enough
and encoding/decoding protobuf wire format with Javascript does not
necessarily have a better performance than the built-in JSON
encoder/decoder.
Protobuf has a big advantage over JSON for some web apps. In particular,
when you are transferring big amounts of data. In our use case (client-side
WebGL vector maps https://www.mapbox.com/blog/mapbox-gl-js/, with lots of
numeric data on the wire), Protobuf provides about 2-3 smaller gzipped
sizes compared to JSON. In addition, it is much faster to decode —
`JSON.parse` parses the data all at once due to the arbitrarily nested
nature of JSON, while with Protobuf, you can parse data sequentially, chunk
by chunk.
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