无法访问JSON API并给我引用错误

Question

我在尝试访问以下API formula one API时收到引用错误

我得到的错误是我无法访问MRData。我使用过JSON编辑器，我相信我有正确的途径。以下是发布请求。

app.get('/about', function(req, res){
res.render('about', {standings: null});
});

app.post('/about', function(req, res){
var year = req.body.Year;

var url = `http://ergast.com/api/f1/${year}/driverstandings.json?callback=`
request(url, function (err, response, body){
  if(err){
    res.render('about', {standings: null, error: 'Error, please try again'});
  } else {
    let standings = JSON.parse(body)
    if(standings.MRData === undefined) {
      res.render('about', {standings: null, error: 'Error, please try again'});
    } else {
      let firstName = MRData.StandingsTable.StandingsLists[0].DriverStandings[0].Driver.givenName
      let standingsText = `The winner of the formula 1 championship in the year ${MRData.StandingsTable.season} is ${firstName}`;
      res.render('about', {standings: standingsText, error: null});
    }
   }

 });

 });

任何帮助，将不胜感激。感谢您对此进行调查。

Answer 1

我能想到有1个语法错误和1个可选方案。

语法错误：

在else部分，您直接引用MRData，而您应该通过standings.MRData引用它。对firstName和standingsText都有

let firstName = standings.MRData.StandingsTable.StandingsLists[0].DriverStandings[0].Driver.givenName
let standingsText = `The winner of the formula 1 championship in the year ${standings.MRData.StandingsTable.season} is ${firstName}`;

另一个场景是req.body.Year可能是空白的，你正在使用它，所以控制台记录网址可能会导致一个解决方案。