rake aborted! Could not find a JavaScript runtime

Question

I'm a beginner in Ruby and I have had some trouble starting

I created a demo project:

C:\Sites>rails new demo
      create
      create  README.rdoc
      create  Rakefile
      create  config.ru
      create  .gitignore
      create  Gemfile
      create  app
      create  app/assets/javascripts/application.js
      ...
      create  vendor/assets/stylesheets/.keep
         run  bundle install
Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Using mail (2.5.4)
Installing actionmailer (4.0.2)
...
Your bundle is complete!
Use `bundle show [gemname]` to see where a bundled gem is installed

Next, selected the folder:

C:\Sites>cd demo

I maked rake... and plop!

C:\Sites\demo>rake about
rake aborted!
Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes.
C:/Sites/demo/config/application.rb:7:in `<top (required)>'
C:/Sites/demo/Rakefile:4:in `<top (required)>'
(See full trace by running task with --trace)

I tried run the server... but not works

C:\Sites\gui>rails server
C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-2.0.2/lib/execjs/run
times.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://gi
thub.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUn
available)
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-2.0.2/l
ib/execjs.rb:5:in `<module:ExecJS>'
        from C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/execjs-2.0.2/l
ib/execjs.rb:4:in `<top (required)>'

Help me, pls.

Stoic · Accepted Answer · 2013-12-26 20:17:28Z

17

The reason is pretty self explanatory and says that a JS runtime was not available. You can explicitly add that dependency by adding rubyracer gem to your rails application, and that should include the JS runtime, for you.

So, add gem 'therubyracer' to your Gemfile, and then, run bundle command, again. Then, you can run your rake or rails commands, as desired :)

If that does not solve your problem, install node.js on your system, and that should solve your problem, for sure. You can use:

sudo apt-get install nodejs # on ubuntu
brew install node # on mac-osx, if you have `homebrew` installed.

answered Dec 26, 2013 at 20:17

Stoic

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Oliver Shaw · Accepted Answer · 2013-12-26 20:18:03Z

0

You need a javascript runtime.

Install node.js from here http://nodejs.org/. Make sure that the executable added to PATH.

answered Dec 26, 2013 at 20:18

Oliver Shaw

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