yahoo_finance_data_reader 0.0.5

Data reader for yahoo finance to get daily stocks prices. It can be used to develop backtests and it can get all the historic daily data on yahoo finance

This project is a migration of the pandas functionality to read yahoo finance stock prices

https://github.com/pydata/pandas-datareader/blob/main/pandas_datareader/yahoo/daily.py

This lib have a strong advantage on backtesting strategies as it can give all the dataframe in yahoo finance, this means that can get daily data on futures like NQ=F and ES=F since 2000 and it goes as far as getting data from 1927 on the SP500 yahoo finance symbol ^GSPC

Features

Get daily data from yahoo finance for the entire dataframe available

Getting started

Add the dependency to your pubspec.yaml:

yahoo_finance_data_reader: ^0.0.2

Usage

List<dynamic> prices = await YahooFinanceDailyReader().getDailyData('GOOG');

Additional information

To include in your app as a widget you can start with this future builder and debug your way until your desired result

FutureBuilder(
    future: const YahooFinanceDailyReader().getDailyData('GOOG'),
    builder:
        (BuildContext context, AsyncSnapshot<List<dynamic>> snapshot) {
        if (snapshot.connectionState == ConnectionState.done) {
        List<dynamic> historicalData = snapshot.data!;
        return ListView.builder(
            itemCount: historicalData.length,
            itemBuilder: (BuildContext context, int index) {
                return Container(
                    margin: const EdgeInsets.all(10),
                    child: Text(historicalData[index].toString()));
            });
        } else if (snapshot.hasError) {
        return Text('Error ${snapshot.error}');
        }

        return const Center(
        child: SizedBox(
            height: 50,
            width: 50,
            child: CircularProgressIndicator(),
        ),
        );
},
)

Use a proxy to use this project in flutter web

To use this project in flutter web and don't get the CORS error, you can use a prefix in the constructor of the data reader

List<dynamic> prices = 
    await YahooFinanceDailyReader(prefix: 'https://thingproxy.freeboard.io/fetch/https://').getDailyData('GOOG');

Like us on pub.dev

Package url: https://pub.dev/packages/yahoo_finance_data_reader

Instruction to publish the package to pub.dev

dart pub publish