servidor não recebe o json corretamente.

Olá,

seguindo as instruções do professor, fiz o cadastra-livros-terminal.js mas o JSON.stringify parece não resolver muito. quando executo o codigo me retorna o seguinte erro no server:

{ Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
    at Query.Sequence._packetToError (C:\wamp\www\casadocodigo\node_modules\mysql\lib\protocol\sequences\Sequence.js:52:14)
    at Query.ErrorPacket (C:\wamp\www\casadocodigo\node_modules\mysql\lib\protocol\sequences\Query.js:77:18)
    at Protocol._parsePacket (C:\wamp\www\casadocodigo\node_modules\mysql\lib\protocol\Protocol.js:279:23)
    at Parser.write (C:\wamp\www\casadocodigo\node_modules\mysql\lib\protocol\Parser.js:76:12)
    at Protocol.write (C:\wamp\www\casadocodigo\node_modules\mysql\lib\protocol\Protocol.js:39:16)
    at Socket.<anonymous> (C:\wamp\www\casadocodigo\node_modules\mysql\lib\Connection.js:103:28)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    --------------------
    at Protocol._enqueue (C:\wamp\www\casadocodigo\node_modules\mysql\lib\protocol\Protocol.js:145:48)
    at Connection.query (C:\wamp\www\casadocodigo\node_modules\mysql\lib\Connection.js:208:25)
    at ProdutosDAO.salva (C:\wamp\www\casadocodigo\app\infra\ProdutosDAO.js:11:19)
    at C:\wamp\www\casadocodigo\app\routes\produtos.js:38:17
    at Layer.handle [as handle_request] (C:\wamp\www\casadocodigo\node_modules\express\lib\router\layer.js:95:5)
    at next (C:\wamp\www\casadocodigo\node_modules\express\lib\router\route.js:137:13)
    at Route.dispatch (C:\wamp\www\casadocodigo\node_modules\express\lib\router\route.js:112:3)
    at Layer.handle [as handle_request] (C:\wamp\www\casadocodigo\node_modules\express\lib\router\layer.js:95:5)
    at C:\wamp\www\casadocodigo\node_modules\express\lib\router\index.js:281:22
    at Function.process_params (C:\wamp\www\casadocodigo\node_modules\express\lib\router\index.js:335:12)
  code: 'ER_PARSE_ERROR',
  errno: 1064,
  sqlMessage: 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \'\' at line 1',
  sqlState: '42000',
  index: 0,
  sql: 'insert into livros set ' }

o meu client está da seguinte maneira :

var http = require("http");


var config = {
    hostname : 'localhost',
    port      : 3000,
    path     : '/produtos',
    method   : 'post',
    headers  :{
        'Accept':'Application/json'
    }
}

var client = http.request(config, function(res){
    console.log(res.statusCode);
    res.on('data', function(body){
        console.log('corpo' + body);
    });
})


var produto = {
    nome : 'node: backend em js',
    author: 'James Anaker',
    lancamento: '2017-08-15'
}

client.end( JSON.stringify(produto) );

como resolvo isso?