Ruby JSON parser with clear errors

require 'json'

class JsonInputError < StandardError; end

def parse_json_strict(text)
  raise JsonInputError, 'JSON input must be a string' unless text.is_a?(String)
  JSON.parse(text)
rescue JSON::ParserError => error
  line = error.message[/line (\d+)/, 1]
  column = error.message[/column (\d+)/, 1]
  where = line ? %Q( at line #{line}, column #{column}) : ''
  raise JsonInputError, %Q(invalid JSON#{where}: #{error.message})
end