json2pb

json2pb is a simple cli tool that can convert a json object to a protobuf message.

This is really useful when you refactor your obsolete restful APIs.

Converting a json request and response to pb message, and add your own service definition, cool!

install

• you must install rust dev environment first.
• git clone https://github.com/caibirdme/json2pb.git
• cd {dir}/json2pb
• cargo install --path . --bin j2pb

usage

j2pb -h

``` j2pb 0.1.0 ronaldoliu@tencent.com convert json to protobuf3

USAGE: j2pb [OPTIONS] -f

FLAGS: -h, --help Prints help information -V, --version Prints version information

OPTIONS: -f specify json file name -o specify file to save generated proto(default: stdout)

```

example: ``` j2pb -f test.json

this will print generated protobuf message on the screen(stdout)

```

``` j2pb -f test.json -o test.proto

this will create test.proto file and save generated protobuf message in it

```

NOTICE

protobuf itself doesn't support nested array, so you can't convert json with nested array, like: json { "foo": [ [1,2,3], [4,5,6] ] }

And json itself just supports double type, but most often, people use it to store integer. So json2pb will try to convert a double value T to int64 if it satisfies both the two constraints: * (T.floor()-T).abs() < f64::EPSILON // means T is an integer * -(2^53-1) <= T <= 2^53-1 // double can only store integer in this range precisely