Json Format

book_json <- fromJSON('book.json', simplifyDataFrame = TRUE)
book_json
## $books
##   category
## 1 Textbook
## 2 Textbook
## 3 Textbook
##                                                                                         title
## 1                             Practical Statistics for Data Scientists: 50 Essential Concepts
## 2                      R for Data Science: Import, Tidy, Transform, Visualize, and Model Data
## 3 R Cookbook: Proven Recipes for Data Analysis, Statistics, and Graphics (O'reilly Cookbooks)
##                             authors         isbn13 pageCount
## 1          Peter Bruce;Andrew Bruce 978-1118834817       474
## 2       Silge,Julia; Robinson,David 978-1491981658       194
## 3 Wickham,Hadley; Grolemund,Garrett 978-1491910399       522
##        publisher edition
## 1          Wiley       1
## 2 O'reilly Media       1
## 3 O'reilly Media       1

HTML Format

book_html <- readHTMLTable('book.html')
book_html
## $`NULL`
##   Category
## 1 Textbook
## 2 Textbook
## 3 Textbook
##                                                                                         Title
## 1                             Practical Statistics for Data Scientists: 50 Essential Concepts
## 2                      R for Data Science: Import, Tidy, Transform, Visualize, and Model Data
## 3 R Cookbook: Proven Recipes for Data Analysis, Statistics, and Graphics (O'reilly Cookbooks)
##                             Authors        ISBN-13 Page Count
## 1          Peter Bruce;Andrew Bruce 978-1118834817        474
## 2       Silge,Julia; Robinson,David 978-1491981658        194
## 3 Wickham,Hadley; Grolemund,Garrett 978-1491910399        522
##        Publisher Edition
## 1          Wiley       1
## 2 O'reilly Media       1
## 3 O'reilly Media       1

XML Format

book_xml <- xmlToDataFrame('book.xml')
book_xml
##   category
## 1 Textbook
## 2 Textbook
## 3 Textbook
##                                                                                         title
## 1                             Practical Statistics for Data Scientists: 50 Essential Concepts
## 2                      R for Data Science: Import, Tidy, Transform, Visualize, and Model Data
## 3 R Cookbook: Proven Recipes for Data Analysis, Statistics, and Graphics (O'reilly Cookbooks)
##                             authors        isbn_13 page_count
## 1          Peter Bruce;Andrew Bruce 978-1118834817        474
## 2       Silge,Julia; Robinson,David 978-1491981658        194
## 3 Wickham,Hadley; Grolemund,Garrett 978-1491910399        522
##        publisher edition
## 1          Wiley       1
## 2 O'reilly Media       1
## 3 O'reilly Media       1

The three dataframe are identical.