我想解析 JSON 数据并将其显示在网站上，但错误是 Unexpected token o in JSON at position 1

Question

这就是 output 的样子。

{
  dataset: {
    id: 9775687,
    dataset_code: 'FB',
    database_code: 'WIKI',
    name: 'Facebook Inc. (FB) Prices, Dividends, Splits and Trading Volume',
    description: 'End of day open, high, low, close and volume, dividends and splits, and split/dividend adjusted open, high, low close and volume for Facebook, Inc. (FB). Ex-Dividend is non-zero on ex-dividend dates. Split Ratio is 1 on non-split dates. Adjusted prices are calculated per CRSP (www.crsp.com/products/documentation/crsp-calculations)\n' +
      '\n' +
          'This data is in the public domain. You may copy, distribute, disseminate or include the data in other products for commercial and/or noncommercial purposes.\n' +
          '\n' +
          "This data is part of Quandl's Wiki initiative to get financial data permanently into the public domain. Quandl relies on users like you to flag errors and provide data where data is wrong or missing. Get involved: connect@quandl.com\n",
        refreshed_at: '2018-03-27T21:46:11.036Z',
        newest_available_date: '2018-03-27',
        oldest_available_date: '2012-05-18',
        column_names: [ 'Date', 'Close' ],
        frequency: 'daily',
        type: 'Time Series',
        premium: false,
        transform: 'rdiff',
        column_index: 4,
        start_date: '2014-01-01',
        end_date: '2014-12-31',
        data: [
          [Array], [Array],
          [Array], [Array],
          [Array], [Array],
          [Array]
        ],
        collapse: 'monthly',
        order: 'desc',
        database_id: 4922
    }
}

我想使用这些数据并将其显示在我的网站上。

我正在使用的代码如下：

var unirest = require("unirest");

var req = unirest("GET", "https://quandl1.p.rapidapi.com/datasets/WIKI/FB.json");

req.query({
    "start_date": "2014-01-01",
    "transform": "rdiff",
    "column_index": "4",
    "collapse": "monthly",
    "end_date": "2014-12-31",
    "order": "desc"
});

req.headers({
    "x-rapidapi-host": "quandl1.p.rapidapi.com",
    "x-rapidapi-key": "e9255b460cmsh863ffa7bd83b3bep19d626jsne90553c61953"
});

var data;

req.end(function (res) {
    if (res.error) throw new Error(res.error);
    data = res.body;
});

var output = data.dataset.dataset_code;

var express = require('express');

var app = express();
app.use(express.static(__dirname +'/public'))

app.get('/apidata', function(req, res){
    res.send(output);
}) 

app.listen(3000);

output 未显示数据，并在 position 1 的 JSON 中显示意外令牌 o。

如何将数据提取到新变量并使用 hbs 在 HTML 中显示？