grpc in nodejs

grpc_client.js

const grpc = require('grpc')
const PROTO_PATH = './notes.proto'
const NoteService = grpc.load(PROTO_PATH).NoteService
const client = new NoteService('localhost:50051',
    grpc.credentials.createInsecure())

    console.log('client', client)
    module.exports = client

    client.list({}, (error, notes) => {
        if (!error) {
            console.log('successfully fetch List notes')
            console.log(notes)
        } else {
            console.error(error)
        }
    })

grpc_server.js

const grpc = require('grpc')
const notesProto = grpc.load('notes.proto')
const uuidv1 = require('uuid/v1')

const notes = [
    { id: '1', title: 'Note 1', content: 'Content 1'},
    { id: '2', title: 'Note 2', content: 'Content 2'}
]
const server = new grpc.Server()
server.addService(notesProto.NoteService.service, {
    list: (_, callback) => {
        callback(null, notes)
    },

    insert: (call, callback) => {
        let note = call.request
        note.id = uuidv1()
        notes.push(note)
        callback(null, note)
    }
})
server.bind('127.0.0.1:50051', grpc.ServerCredentials.createInsecure())
console.log('Server running at http://127.0.0.1:50051')
server.start()

notes.proto

syntax = "proto3";
service NoteService {
    rpc List (Empty) returns (NoteList) {}
    rpc Insert (Note) returns (Note) {}
}
message Empty {}
message Note {
   string id = 1;
   string title = 2;
   string content = 3;
}
message NoteList {
   repeated Note notes = 1;
}