Install Ruby JSON Gem on Windows
When attempting to install the Ruby JSON gem on Windows you are most likely going to get an error similar to the below. The trick is to instead install json_pure gem using the syntax listed below the error.
C:>gem install json Building native extensions. This could take a while... ERROR: Error installing json: ERROR: Failed to build gem native extension. C:/ruby/bin/ruby.exe extconf.rb install json creating Makefile nmake 'nmake' is not recognized as an internal or external command, operable program or batch file. Gem files will remain installed in C:/ruby/lib/ruby/gems/1.8/gems/json-1.1.3 for inspection. Results logged to C:/ruby/lib/ruby/gems/1.8/gems/json-1.1.3/ext/json/ext/parser/gem_make.out
Install json_pure gem:
gem install json_pure
That should do it.