find the size of a json file in ruby

To find the size of a JSON file in Ruby, you need to open the file in reading mode and then call the File#size method to get its size in bytes. Here's an example code:

main.rb
require 'json'

# Open file in reading mode
file = File.open('file.json', 'r')

# Read JSON and get its size
json_data = file.read
file_size = file.size

# Close the file
file.close

puts "JSON data: #{json_data}"
puts "JSON file size: #{file_size} bytes"
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In this code, we used the File#open method to open the "file.json" file in reading mode, then we used the File#read method to read the file's JSON content into the json_data variable. Finally, we called the File#size method to get the file's size in bytes and saved it into the file_size variable.

Note that we closed the file using the File#close method. It's always a good practice to close the file after you're done reading/writing from/to it.