尝试从字符串解析JSON数据时出错

Question

我正在尝试让我的代码准备好将json发送回我的聊天机器人，有人可以告诉我为什么我收到错误：

    const data = '{ "Company Name": companyname, "service type": service }'
        try {
          const user = JSON.parse(data)
        } catch(err) {
          console.error(err)
}

这是我完整的低代码，所有这些都与此无关

//=======================================================================================
//  Get the Client data from database
//=======================================================================================
app.get("/Getcompany", function(request, response) {
  const cname = request.query.cname, query = `select * from clientdata_nsw where companyname  = ${connection.escape(
    cname
  )}`;
  connection.query(query, function(err, rows) {
    if (err) {
      console.log(err);
      return;
    }
    const data = '{ "Company Name": companyname, "service type": service }'
        try {
          const user = JSON.parse(data)
        } catch(err) {
          console.error(err)
}
    rows.forEach(function(result) {
      console.log(
        result.companyname,
        result.service,
        result.phone,
        result.open_times,
        result.rating_facebook,
        result.rating_goggle
      );
    });
    response.json({})
  });

})



  // listen for requests :)
var listener = app.listen(process.env.PORT, function () {
  console.log('Your app is listening on port ' + listener.address().port);
});

Answer 1

第一行本身存在错误

const data = '{ "Company Name": companyname, "service type": service }'
JSON.parse(data)

您必须转义公司名称和服务，因为JSON解析器无法解析它们，否则使用JS对象而不是解析字符串并形成JS对象。我不明白为什么你在代码中有这些行，因为它们根本不用于任何东西。

const data = '{ "Company Name": "companyname", "service type": "service" }'
JSON.parse(data)

整个代码使用ES6标准重写。

const PORT = process.env.PORT;

app.get("/Getcompany", async (request, response) => {
  const cname = request.query.cname,
    query = `select * from clientdata_nsw where companyname  = ${connection.escape(
      cname
    )}`;
  const data = '{ "Company Name": "companyname", "service type": "service" }';
  try {
    const user = JSON.parse(data);
  } catch (err) {
    console.error(err);
  }
  try {
    const results = await connection.query(query);
    results.forEach(row => {
      console.log(
        row.companyname,
        row.service,
        row.phone,
        row.open_times,
        row.rating_facebook,
        row.rating_goggle
      );
    });
  } catch (error) {
    console.error(error);
  }
  response.json({});
});

app.listen(PORT, () => {
  console.log(`Your app is listening on port ${PORT}`);
});