我将如何在 Dart 中访问此 JSON 数据以用于 Flutter 项目？

Question

This is the JSON data and I'm trying to access the date and the open value with this code but I'm getting errors. What would the proper syntax be?

factory Stock.fromJson(Map<String, dynamic> json) { // parse the json into data we can use
    return Stock(
      date: json['Time Series (Daily)[0]'],
      open: json['Time Series (Daily[0].open'],
      high: json['Time Series (Daily[0].high'],
      low: json['Time Series (Daily[0].low'],
      close: json['Time Series (Daily[0].close'],
      volume: json['Time Series (Daily[0].volume']
    );
  }

{
    "Meta Data": {
        "1. Information": "Daily Prices (open, high, low, close) and Volumes",
        "2. Symbol": "MSFT",
        "3. Last Refreshed": "2020-03-26",
        "4. Output Size": "Compact",
        "5. Time Zone": "US/Eastern"
    },
    "Time Series (Daily)": {
        "2020-03-26": {
            "1. open": "148.4000",
            "2. high": "156.6600",
            "3. low": "148.3700",
            "4. close": "155.8800",
            "5. volume": "64143669"
        }
}

Answer 1

To get json objects or values of your json data, you need to pass attributes names and manipulate the json object

factory Stock.fromJson(Map<String, dynamic> json) { // parse the json into data we can use
return Stock(
  date: json['Time Series (Daily)']['2020-03-26'],
  open: json['Time Series (Daily)']['2020-03-26']['1. open'],
  ...
);

}

You can also convert your json to dart object with this tool : https://javiercbk.github.io/json_to_dart/