MathStudio MathStudio Express

Working with JSON

MathStudio can parse JSON data into an object by using the json function or using the http function to parse JSON data from a URL.

Examples


Parse a JSON string using the JSON function

weather = json('{"coord":{"lon":-0.13, "lat":51.51}, "sys":{"message":0.066, "country":"GB", "sunrise":1403149363, "sunset":1403209271}, "weather":[{"id":800, "main":"Clear", "description":"Sky is Clear", "icon":"01n"}], "base":"cmc stations", "main":{"temp":289.13, "humidity":63, "pressure":1026, "temp_min":287.59, "temp_max":290.37}, "wind":{"speed":4.03, "deg":46.0037}, "clouds":{"all":0}, "dt":1403210284, "id":2643743, "name":"London", "cod":200}')

Parse a JSON string using the JSON function with a filter

weather = json('{"coord":{"lon":-0.13, "lat":51.51}, "sys":{"message":0.066, "country":"GB", "sunrise":1403149363, "sunset":1403209271}, "weather":[{"id":800, "main":"Clear", "description":"Sky is Clear", "icon":"01n"}], "base":"cmc stations", "main":{"temp":289.13, "humidity":63, "pressure":1026, "temp_min":287.59, "temp_max":290.37}, "wind":{"speed":4.03, "deg":46.0037}, "clouds":{"all":0}, "dt":1403210284, "id":2643743, "name":"London", "cod":200}', filter=[temp, humidity])

Convert a temperature from the JSON data

weather(main, temp)@K -> @F

Plot the stock price of Apple using the HTTP function

// Stock symbol for Apple symbol = "AAPL" // Date for 3 months ago startDate = date("y-0m-0d", -3@months) // The "<<" operator is used for string concatenation url = "query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.historicaldata where symbol='" << symbol << "' and startDate='" << startDate << "' and endDate='today'&format=json&diagnostics=true&env=http://datatables.org/alltables.env" stocks = http(url, filter=[Close, Date])
prices = stocks(query, results, quote, *, Close) round(prices)
dates = date("m/d", stocks(query, results, quote, *, Date))
// Plot the stock price of AAPL ListPlot(prices, labels=dates, width=700, height=220, flipAxis=1)

References

http://json.org

Related Functions

http, json
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