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End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Exception#to_json

to_json(*args)

Stores class name (Exception) with message m and backtrace array b as JSON string

See also #set_backtrace #to_s #message also in 4.0 · 3.4 · 3.3 · 3.1 · 3.0