json_file_io

📂 Read and Write JSON Files

Combining Ruby’s File class with json makes it easy to persist data or load configurations. To read a JSON file, use File.read and JSON.parse. To write, use File.write along with JSON.pretty_generate for human-friendly formatting.

require 'json'

# Writing to a file
data = { settings: { theme: "dark", notifications: true } }
File.write("config.json", JSON.pretty_generate(data))

# Reading from a file
json_text = File.read("config.json")
config = JSON.parse(json_text)
puts config["settings"]["theme"]  # => "dark"

Using pretty_generate adds newlines and indentation, making the JSON file easy to read and edit by hand.