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Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

Rational#to_json

to_json(*args)

Returns a JSON string representing self:

Example
require 'json/add/rational'
puts Rational(2, 3).to_json

Output:

Example
{"json_class":"Rational","n":2,"d":3}
See also #to_i #to_r #to_f #to_s also in 4.0 · 3.4 · 3.2 · 3.1 · 3.0