read a json file in ruby

To read a JSON file in Ruby, you need to use the built-in JSON library. Here are the steps to do it:

Require the json library:


main.rb
require 'json'
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2 lines

Open the JSON file using File.open:


main.rb
file = File.open('file.json')
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Parse the JSON data using JSON.parse:


main.rb
data = JSON.parse(file.read)
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Close the file:


main.rb
file.close
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Now, the data variable will hold the parsed JSON data, which you can access like any other Ruby data structure.

Here's an example JSON file and Ruby code to demonstrate:

example.json


{
  "name": "John",
  "age": 30,
  "city": "New York"
}
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6 lines

example.rb


main.rb
require 'json'

file = File.open('example.json')
data = JSON.parse(file.read)
file.close

puts data['name']
puts data['age']
puts data['city']
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Output:


main.rb
John
30
New York
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4 lines

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