JapanAPIs

The JapanAPIs package provides a unified interface to access open data from the World Bank API, Nager.Date API, and the REST Countries API, with a focus on Japan. It allows users to retrieve up-to-date or historical information on topics such as economic indicators, population statistics, national holidays, and basic geopolitical details.

In addition to API-access functions, the package includes one of the largest curated collections of open datasets related to Japan. These datasets cover a wide range of topics including natural disasters, economic production, the vehicle industry, air quality, demographic trends, and administrative divisions.

Installation

You can install the JapanAPIs package from CRAN with the following R function:

install.packages("JapanAPIs")

Usage

After installation, load the package and start exploring and using its functions and datasets.

library(JapanAPIs)

JapanAPIs Functions

Below is a list of the main functions included in the package:

• get_japan_child_mortality(): Get Under-5 Mortality Rate in Japan from World Bank

• get_japan_cpi(): Get Japan's Consumer Price Index from World Bank

• get_japan_energy_use(): Get Japan's Energy Use (kg of oil equivalent per capita) from World Bank

• get_japan_gdp(): Get Japan's GDP (Current US$) from World Bank

• get_japan_holidays(): Get official public holidays in Japan for a given year, e.g. get_japan_holidays(2025)

• get_japan_hospital_beds(): Get Hospital Beds per 1,000 People in Japan from World Bank

• get_japan_life_expectancy(): Get Japan's Life Expectancy at Birth from World Bank

• get_japan_literacy_rate(): Get Japan's Literacy Rate (Age 15+) from World Bank

• get_japan_population(): Get Japan's Total Population from World Bank

• get_japan_unemployment(): Get Japan's Unemployment Rate from World Bank

• get_country_info_jp(): Get Key Country Information About Japan from the REST Countries API

• view_datasets_JapanAPIs(): View Available Datasets in JapanAPIs

Dataset Suffixes

Each dataset in JapanAPIs is labeled with a suffix to indicate its structure and type:

• _df: A standard data frame.

• _tbl_df: A tibble data frame object.

• _ts: A time series object.

• _vec: A numeric vector object.

Datasets Included in JapanAPIs

In addition to API access functions, JapanAPIs offers one of the largest curated collections of open datasets focused on Japan. These preloaded datasets cover a wide range of topics including demography, natural disasters, public health, sports, centenarians, atomic bomb survivors, earthquakes, and administrative data. Below are some featured examples:

• jpn_usd_exchange_df: A Data frame containing weekly observations of the yen-dollar exchange rate from 1975 to 1989.

• jpn_prefectures_tbl_df: A tibble representing Japan’s 47 prefectures arranged in a 7x7 grid layout.

• kobe_quake_1995_ts: A time series containing data related to the 1995 Kobe earthquake.

Example Code:

# Load the package

library(JapanAPIs)

# Retrieves essential information about Japan

get_country_info_jp()

# Get Japan's Population (Total) from World Bank

get_japan_population()

# Load a dataset

data(japan_population_tbl_df)

# Shows six rows of the dataset

head(japan_population_tbl_df)

# Display the structure of the dataset

str(japan_population_tbl_df)

# Shows the whole dataset

View(japan_population_tbl_df)