JSON with jsonlite in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to convert a list to JSON using jsonlite.

R Programming

library(jsonlite)
my_list <- list(name = "Alice", age = 25)
json_data <- toJSON([1])
print(json_data)

Drag options to blanks, or click blank then click option'

Ajson_data

Bmy_list

Clist

DtoJSON

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the result variable instead of the data variable.

Using the function name inside itself.

The toJSON() function converts an R object like my_list into JSON format.

2fill in blank

medium

Complete the code to prettify JSON output with jsonlite.

R Programming

library(jsonlite)
my_list <- list(city = "Paris", population = 2148327)
json_data <- toJSON(my_list, [1] = TRUE)
cat(json_data)

Drag options to blanks, or click blank then click option'

Aauto_unbox

Bdigits

CsimplifyVector

Dpretty

Attempts:

3 left

💡 Hint

Common Mistakes

Using auto_unbox which controls single values, not formatting.

Confusing digits with formatting.

The pretty = TRUE option formats JSON with indentation and line breaks for readability.

3fill in blank

hard

Fix the error in the code to parse JSON string back to R object.

R Programming

library(jsonlite)
json_str <- '{"fruit":"apple","count":10}'
my_data <- [1](json_str)
print(my_data)

Drag options to blanks, or click blank then click option'

AfromJSON

BparseJSON

CtoJSON

Djsonlite

Attempts:

3 left

💡 Hint

Common Mistakes

Using toJSON() which converts R to JSON, not the other way.

Using a non-existent function parseJSON().

The fromJSON() function converts a JSON string back into an R object.

4fill in blank

hard

Fill both blanks to create a JSON from a named vector and parse it back.

R Programming

library(jsonlite)
vec <- c(a = 1, b = 2, c = 3)
json_vec <- [1](vec, [2] = TRUE)
parsed_vec <- fromJSON(json_vec)
print(parsed_vec)

Drag options to blanks, or click blank then click option'

AtoJSON

Bpretty

Cauto_unbox

DfromJSON

Attempts:

3 left

💡 Hint

Common Mistakes

Using fromJSON in the first blank which is for parsing JSON.

Using auto_unbox instead of pretty for formatting.

Use toJSON() to convert the vector, and pretty = TRUE to format the JSON nicely.

5fill in blank

hard

Fill all three blanks to convert a data frame to JSON with unboxed values and parse it back.

R Programming

library(jsonlite)
df <- data.frame(name = c("Tom", "Sue"), age = c(30, 25))
json_df <- [1](df, [2] = TRUE)
parsed_df <- [3](json_df)
print(parsed_df)

Drag options to blanks, or click blank then click option'

AtoJSON

Bauto_unbox

CfromJSON

Dpretty

Attempts:

3 left

💡 Hint

Common Mistakes

Using pretty instead of auto_unbox for the second blank.

Using toJSON instead of fromJSON for parsing.

Use toJSON() to convert the data frame, auto_unbox = TRUE to avoid arrays for single values, and fromJSON() to parse back.