TypeError:res.json不是函数 [英] TypeError: res.json is not a function

问题描述

我正在尝试发送两个json，但是它不起作用.它打印TypeError: res.json is not a function，但我不知道为什么发生.有什么想法吗?谢谢!!

I'm trying to send two json but It doesn't work. It prints TypeError: res.json is not a function but I don't get why It happens. Is there any ideas? Thank you !!

app.post('/danger', function response(req, res) {
    let placeId = req.body.data;
    let option = {
      uri: 'https://maps.googleapis.com/maps/api/directions/json?',
      qs: {
        origin:`place_id:${placeId[0]}`, destination: `place_id:${placeId[1]}`,
        language: 'en', mode: 'walking', alternatives: true, key: APIKey
      }
    };
    rp(option)
      .then(function(res) {
        let dangerRate = dangerTest(JSON.parse(res), riskGrid);
        res.json({ data: [res, dangerRate]});
      })
      .catch(function(err) {
        console.error("Failed to get JSON from Google API", err);
      })
});

推荐答案

因为您要覆盖rp函数的.then中的res变量:

Because you're overwriting your res variable in the .then of your rp function:

app.post('/danger', function response(req, res) { //see, "res" here was being overwritten
   ..
   ..
   rp(option).then(function(response) { //change the variable name of "res" to "response" (or "turtles", who cares, just dont overwrite your up most "res")

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