JSON with jsonlite in R Programming - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the jsonlite package in R?

The jsonlite package helps convert R objects to JSON format and JSON data back to R objects easily and reliably.

beginner

How do you convert an R list to JSON using jsonlite?

Use the function toJSON() from jsonlite. For example: toJSON(my_list) converts my_list to JSON.

beginner

How do you read JSON data into R as an R object?

Use the function fromJSON() from jsonlite. For example: fromJSON(json_string) converts JSON text to an R object.

intermediate

What argument in toJSON() makes the JSON output easier to read?

The argument pretty = TRUE formats the JSON output with indentation and line breaks for readability.

beginner

What is a common use case for jsonlite in data analysis?

It is often used to exchange data between R and web APIs or to save R data in a format that other programs can read.

Which function converts JSON text to an R object?

A toJSON()

B json_parse()

C fromJSON()

D json_convert()

The fromJSON() function reads JSON text and converts it into an R object.

How do you make JSON output pretty and easy to read in jsonlite?

A pretty = TRUE in toJSON()

B formatJSON() function

C indent = 4 in fromJSON()

D use jsonlite::beautify()

Setting pretty = TRUE inside toJSON() formats the JSON output with indentation.

What type of R object can toJSON() convert?

A Any R object like lists, vectors, data frames

B Only lists

C Only data frames

D Only character strings

toJSON() can convert many R objects including lists, vectors, and data frames to JSON.

Which package do you need to install to use toJSON() and fromJSON()?

A rjson

B jsonlite

C jsonr

D jsontools

The jsonlite package provides toJSON() and fromJSON() functions.

What is a common reason to use JSON in R?

A To create graphics

B To write R scripts

C To run statistical tests

D To exchange data with web APIs

JSON is commonly used to exchange data between R and web APIs or other programs.

Explain how you would convert an R list to JSON and then back to an R object using jsonlite.

Think about the two main functions in jsonlite for conversion.

Describe why JSON format is useful when working with R and external data sources.

Consider how JSON helps R communicate with other programs.