A JSON lint tool using Ruby and "json" Rubygem

jsonlint

#!/usr/bin/env ruby

require "rubygems"
require "json"

if ARGV.size < 1
  puts "Please provide a JSON file"
  exit 1
end

file_name = ARGV.shift

begin
  JSON.load(File.read(file_name))
  puts "Syntax OK"
  exit 0
rescue JSON::ParserError
  puts "Syntax Error!"
  exit 1
end

Your rescue block masks the json error location. Use https://github.com/dougbarth/jsonlint instead.