JSON文件以可读取的格式将数据存储为文本，它是一种JavaScript对象表示法，在R中可以使用rjson包读取JSON文件。

我们通过将以下数据复制到文本编辑器(如记事本)中创建一个JSON文件，并且使用.json扩展名保存文件，并将文件类型选为所有文件(*.*)，内容如下：

{ 
   "ID":["1","2","3","4","5","6","7","8" ],
   "Name":["Rick","Dan","Michelle","Ryan","Gary","Nina","Simon","Guru" ],
   "Salary":["623.3","515.2","611","729","843.25","578","632.8","722.5" ],

   "StartDate":[ "1/1/2012","9/23/2013","11/15/2014","5/11/2014","3/27/2015","5/21/2013",
      "7/30/2013","6/17/2014"],
   "Dept":[ "IT","Operations","IT","HR","Finance","IT","Operations","Finance"]
}

在R中使用JSON()函数读取JSON文件的内容，它作为列表存储在R中，如下：

# Load the package required to read JSON files.
library("rjson")

# Give the input file name to the function.
result <- fromJSON(file = "input.json")

# Print the result.
print(result)

我们可以将上述提取的数据通过使用as.data.frame()函数转换为R数据帧，以便进一步分析，如下：

# Load the package required to read JSON files.
library("rjson")

# Give the input file name to the function.
result <- fromJSON(file = "input.json")

# Convert JSON file to a data frame.
json_data_frame <- as.data.frame(result)

print(json_data_frame)

好啦，本次记录就到这里了。

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